-403
July 7(Wed.) ~ 9(Fri.) , 2021
, Korea
Online & Offline Hybrid Symposium
program
Invited & Oral Sessions
Invited & Oral Sessions
Energy harvesting material and device technologies for self-powered micro and nano systems
The demand for sensors is greatly increasing with the advent of the IoT era. Such a sensor system requires power for driving a sensor and communicating with a wireless network, and in certain sites where power supply is difficult, a battery is essentially installed to supply power to the wireless sensor system. However, these batteries have a limited life and must be replaced regularly. Accordingly, various energy harvesting technologies for implementing autonomous wireless sensor networks without battery replacement are drawing attention.
-Energy harvesting (piezoelectric, triboelectric, inductive, thermoelectric, electrochemical, radioactive, etc.)
-Emerging Energy harvesting technologies
-Hybrid energy harvesting technologies
-Energy-efficient enery management electronics for energy harvesters
-Applications (structural and industrial health monitoring, wireless sensor network, personal human power, etc.)
Date & Time |
2021-07-08 10:00 ~ 10:30 |
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Place | Online |
Speaker | Jun Chen |
Affiliation | UCLA, USA |
Title | Understanding the charge carrier transport within metal halide perovskites via transient methods |
Lecture Summary
In addition to mobile electrons and holes, the mobile ions in metal halide perovskites redistribute under an applied electric field. It negates many benefits of standard spectroscopic techniques to quantify mobility, such as nanosecond to millisecond transient methods, time-of-flight and space charge limited current measurements. Indeed, an accurate estimation of charge carrier density is hindered by early-time recombination, the branching ratio of excitons to free-carriers and sensitivity to short-range conductivity. It is also important to understand the long-range charge transport within the metal halide perovskite for optimisation of operating devices, where the charges have to travel over on the order of microns, and if these properties change in different carrier density regimes, or through different methods of processing the films. Here this presentation introduces applied methodologies and also highlights an advanced optical and electrical methodologies: Photoinduced transmission and reflection (PITR), Transient photoconductivity (TPC) and Pulsed-voltage space charge limited current (PV-SCLC). With these methods, we accurately estimated the internal free-carrier density during photo-excitation, accounting for both early-time recombination and exciton-to-free-carrier branching ratios to determine long-range charge carrier mobility in metal halide perovskite thin films and single crystals, to be reliable value over many orders of magnitude of charge density. We believe this study is the accurate evaluation of photo-induced long-range mobility of metal halide perovskites, and therefore represents a powerful handle for future optimisation of perovskite solar cells and optoelectronic devices.
Date & Time |
2021-07-08 13:00 ~ 13:30 |
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Place | Online |
Speaker | Ya Yang |
Affiliation | CAS, CHINA |
Title | Hybridized and coupled nanogenerators |
Lecture Summary
A hybridized electromagnetic-triboelectric nanogenerator is to utilize electromagnetic and triboelectric nanogenerators to simultaneously scavenge mechanical energy from one mechanical motion. As compared with the individual energy harvesting unit, the hybridized nanogenerator has much larger output power, higher conversion efficiency so that it can be used to solve the power source issue of some devices with larger power consumption. The hybridized nanogenerators have the potential applications in self-powered sensors, wearable devices, and networks.
Rapid advancements in various energy harvesters impose the challenge on integrating them into one device structure with synergetic effects for full use of the available energies from our environments. We report a multi-effects coupled nanogenerator based on ferroelectric barium titanate, promoting the ability to simultaneously scavenging thermal, solar, and mechanical energies. By integration of a pyroelectric nanogenerator, a photovoltaic cell and a triboelectric-piezoelectric nanogenerator in one structure with only two electrodes, multi-effects interact with each other to alter the electric output, and a complementary power source with peak current of ~ 1.5 µA, platform voltage of ~ 6 V and peak voltage of ~ 7 V is successfully achieved. Compared with traditional hybridized nanogenerators with stacked architectures, the one-structure-based multi-effects coupled nanogenerator is smaller, simpler and less costly, showing prospective in practical applications and represents a new trend of all-in-one multiple energy scavenging.
Date & Time |
2021-07-09 10:00 ~ 10:30 |
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Place | 208 |
Speaker | Ju-Hyuck Lee |
Affiliation | DGIST, KOREA |
Title | Polymer gel based triboelectric nanogenerator for mechanical energy harvesting and tactile sensing |
Lecture Summary
Beyond the rigid or flexible frame-based electronics, the development of stretchable electronics for implementing wearable/attachable electronics or electronic/ionic skin, consisting of transistor, luminescence devices, smart sensors, and energy devices received great attention. It is required to be thin, light, stretchable, and transparent to be integrated with clothes/wears or attached on or implanted into curved human body. The triboelectric nanogenerators (TENG) convert mechanical energy into electrical energy is receiving great attention as a sustainable power source for portable/stretchable electronics because of its simple structure, many materials options, low cost/easy fabrication, and superior power output performance. In this presentation, we introduce polymer gel based stretchable, transparent, and high performance TENG that can harvest biomechanical energy and tactile sensing. We have fabricated ionic/nonionic polymer gel based dielectric layers and investigated its dielectric property, electrical conductivity, and triboelectric property. The fabricated polymer gel has improved its transparency and stretchability. Beside it exhibited an extremely improved dielectric constant and very strong triboelectric behavior that can contribute to enhanced TENG performance. In addition, we introduce a new type of tactile sensor based on charge displacement current that can sense position and pressure without electrode grid patterning.
Date & Time |
2021-07-09 13:00 ~ 13:30 |
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Place | Online |
Speaker | Zong-Hong Lin |
Affiliation | Nat‘l Tsing Hua Univ., Taiwan |
Title | Investigations of The Polymer Brush Modified Structured Silicon in The Hydrogen-Bonding Effect as an Anode Material in Lithium-Ion Batteries |
Lecture Summary
Silicon (Si) has the maximum capacity (> 4000 mAh g-1) compares with the conventional graphite (300-350 mAh g-1), which can dramatically increase the energy density of the battery. However, due to some drawbacks on Si material such as electrochemical irreversibility and volume expansion on alloy reaction, pure Si cannot be used in large quantities in the anode electrode, approximately 3~8 wt% only in commercial products. In this research, a novel method for pure Si material has been developed, a polymer brush modified core-shell structure (PBCS) by hydrosilylation reaction on Si nanoparticles. According to the results, the PBCS structure provides three significant functions on Si particles because of the effects of hydrogen bonding such as good dispersion in the slurry, a protection during cycling, and excellent conductivity for high-rate tests. The polymer brush is fabricated by the acrylic acids in which the hydrogen bonding effects between each carbonyl groups are used to enhance lithium-ion diffusion and the adjustment of attraction and repulsion in between particles. The PBCS Si electrode shows the first columbic efficiency is 87.1%, the retentions are 92.5% (0.1C/ 0.1C) for 200 cycles and 86.2% (0.5C/ 0.5C) for 400 cycles, respectively. The TEM and TXM results display that the PBCS structure significantly protects the nano Si from cracking owing to the high elastic function. Operando measurements such as GCMS and XRD demonstrate that the PBCS significantly inhibits gas evolution and non-crystallinity formation during cycling. This research shows this novel PBCS Si no longer needs electrolyte additives and another surface coating for preventing those drawbacks in previously mentioned. With this novel PBCS Si material, a high energy density lithium-ion battery contains pure Si or a higher amount of Si can be expected.
Date & Time |
2021-07-09 14:45 ~ 15:15 |
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Place | 208 |
Speaker | Sang-Woo Kim |
Affiliation | Sungkyunkwan University, KOREA |
Title | Triboelectric nanogenerator for powering wearable and body-implantable electronics |
Lecture Summary
Energy harvesting systems based on triboelectric nanomaterials are in great demand, as they can provide routes for the development of self-powered devices which are highly flexible, stretchable, mechanically durable, and can be used in a wide range of applications. Our recent research interest mainly focuses on the fabrication of high-performance triboelectric nanogenerators (TENGs) based on various kinds of nanomaterials. Flexible TENGs exhibit good performances and are easy to integrate which make it the perfect candidate for many applications, and therefore crucial to develop. In this presentation, I firstly introduce the fundamentals and possible device applications of TENGs, including their basic operation modes. Then the different improvement parameters will be discussed. As main topics, I will report transcutaneous ultrasound energy harvesting using triboelectric technology. Implantable medical devices (IMDs) are designed to perform or augment the functions of existing organs by using monitoring, measuring, processing units, and the actuation control. Conventional IMDs are powered with primary batteries that require frequent surgeries for maintenance and replacement. Therefore, IMDs require a new reliable and safe powering system to avoid the need for frequent surgeries. Recently my group demonstrated that ultrasound was used to deliver mechanical energy through skin and liquids and demonstrated that a thin inplantable vibrating triboelectric nanogenerator (TENG) is able to effectively harvest it. Ultrasound TENG (US-TENG) was triggered with an applied 20-kHz ultrasound at 3 W/cm2 reaching 9.71 V(root mean square [RMS]) and 427 ARMS. The measured output current was enhanced two orders of magnitude compared with conventional TENGs, with a similar level of surface charge density, triggered in low-frequency mechanical environments. Interestingly, to experimentally simulate clinical conditions closer to human in the laboratory, we inserted US-TENG under porcine tissue, showing that it fully charged a rechargeable Li-ion battery having a capacity of 0.7 mAh. As the second topic, I will deal with our very recent demonstration of a commercial coin battery-sized high-performance inertia-driven TENG (I-TENG) based on body motion and gravity. In a preclinical test, we demonstrate that the encapsulated device successfully harvested energy using real-time output voltage data monitored via a Bluetooth low-energy information-transmitting system. Details will be presented in the conference site.
Date & Time |
2021-07-09 17:00 ~ 17:30 |
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Place | Online |
Speaker | Sohini Kar-Narayan |
Affiliation | Univ. of Cambridge, UK |
Title | Materials-related Strategies for Highly Efficient Triboelectric Nanogenerators |
Lecture Summary
Triboelectric energy harvesting technologies have received a substantial amount of attention as they constitute one of the most efficient ways of transforming vibrational and frictional energy into electrical energy, regardless of location and environmental conditions.
One of the most significant advantages of this technology is in the suitability of a very wide range of materials that can be readily incorporated into devices. In order to achieve efficient energy harvesting performance, advances in materials science and nanotechnology have been applied to develop high-performance triboelectric nanogenerators, which have witnessed a tremendous growth in popularity. In this talk, I will discuss materials-driven progress related to triboelectric energy harvesting, with emphasis on the study of materialsrelated operating mechanisms and emergent materials design strategies for highly efficient triboelectric devices. In particular, I will focus on the role of polymer crystallinity and
surface polarization in determining the triboelectric energy harvesting properties of polymeric nanowires. For example, the strong hydrogen bonding in α-phase nylon-11 serves to enhance the molecular ordering, resulting in exceptional intensity and thermal stability of surface potential, and consequently enhanced triboelectric performance compared to other polymorphs of nylon-11. Similarly, tailoring of surface potential in electrospun polymer fibers leads to higher energy harvesting performance in textile-based triboelectric yarns.
Date & Time |
2021-07-08 10:30 ~ 10:45 |
Place | 208 |
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Speaker | Hyungseok Yong | Affiliation | Chung-Ang University |
Title | Condensed-droplet-based electricity generator via water-phase change and electrification |
Date & Time |
2021-07-08 10:45 ~ 11:00 |
Place | 208 |
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Speaker | SunWoo Kim | Affiliation | Sungkyunkwan University |
Title | High voltage-high stability water splitting system through voltage tunning |
Date & Time |
2021-07-08 11:00 ~ 11:15 |
Place | 208 |
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Speaker | Younghoon Lee | Affiliation | Seoul National University |
Title | Spiderweb-inspired artificial ionic threads for adhesion, proximity sensing, and self-cleaning |
Date & Time |
2021-07-08 11:15 ~ 11:30 |
Place | 208 |
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Speaker | Rahul Purbia | Affiliation | Sungkyunkwan University |
Title | CuO/Nb2O5 Composites for selective H2S and SO2 gas sensing at low temperature |
Date & Time |
2021-07-08 11:30 ~ 11:45 |
Place | 208 |
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Speaker | Joonchul Shin | Affiliation | KIST |
Title | Significant increase of internal temperature difference with maximum power output by using porous filler |
Date & Time |
2021-07-08 13:30 ~ 13:45 |
Place | 208 |
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Speaker | Sun-Woo Kim | Affiliation | Korea University |
Title | Appropriate properties of piezoelectric materials for high output power depending on various types of piezoelectric energy harvesters |
Date & Time |
2021-07-08 13:45 ~ 14:00 |
Place | 208 |
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Speaker | Atul Thakre | Affiliation | Yeungnam University |
Title | High performance of polycrystalline ceramic-based magneto-mechano-electric energy harvesters |
Date & Time |
2021-07-08 14:00 ~ 14:15 |
Place | 208 |
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Speaker | Su Hwan Go | Affiliation | Korea University |
Title | Structural and piezoelectric properties of the (K, Na)(Nb, Sb)O3-CaZrO3-(Bi, Ag)ZrO3 lead free piezoelectric ceramics |
Date & Time |
2021-07-08 14:15 ~ 14:30 |
Place | 208 |
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Speaker | Ajeet Kumar | Affiliation | Yeungnam University |
Title | Enhanced energy harvesting performance of magneto-mechano-electric generator with aspect ratio variation of piezoelectric single crystal |
Date & Time |
2021-07-08 14:45 ~ 15:00 |
Place | 208 |
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Speaker | Ji Won Na | Affiliation | Korea university |
Title | High performance piezoelectric energy harvester fabricated using <001>-textured (K,Na)(Nb,Sb)O3-CaZrO3 lead-free piezoceramics |
Date & Time |
2021-07-08 15:00 ~ 15:15 |
Place | 208 |
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Speaker | Deepak Patil | Affiliation | Yeungnam University |
Title | Enhancement of output power of magneto-mechano-electric generator by optimizing the magnet proof mass position with magnetic flux concentrator |
Date & Time |
2021-07-08 15:15 ~ 15:30 |
Place | 208 |
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Speaker | Jae Min Eum | Affiliation | Korea University |
Title | Structural and piezoelectric properties of the (K, Na)(Nb, Sb)O3-SrZrO3-(Bi, Ag)ZrO3 lead free piezoelectric ceramics |
Date & Time |
2021-07-08 15:30 ~ 15:45 |
Place | 208 |
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Speaker | Young Hoon Jung | Affiliation | Korea Advanced Institute of Science and Technology |
Title | Highly-Sensitive, Biomimetic Flexible Piezoelectric PNZT Acoustic Sensors for Deep Learning-based Speech Processing under Noise Condition |
Date & Time |
2021-07-08 15:45 ~ 16:00 |
Place | 208 |
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Speaker | Dae-Su Kim | Affiliation | Korea university |
Title | Remarkable piezoelectric performance and good thermal stability of <001>-textured 0.96(K0.5Na0.5)(Nb1-ySby)O3-0.04SrZrO3 lead-free piezoelectric ceramics |
Date & Time |
2021-07-09 10:30 ~ 10:45 |
Place | 208 |
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Speaker | Sae Hyuk Lee | Affiliation | Kyung Hee University |
Title | Portable Electrospray System based on Self-Powered High-voltage generator |
Date & Time |
2021-07-09 10:45 ~ 11:00 |
Place | 208 |
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Speaker | Seh-Hoon Chung | Affiliation | Chung-ang University |
Title | Non-polar Liquid Lubricant based Triboelectric Nanogenerator for Current Amplification via Direct Electron Transfer |
Date & Time |
2021-07-09 11:00 ~ 11:15 |
Place | 208 |
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Speaker | Hakjeong Kim | Affiliation | Kyung Hee University |
Title | Magnetic-Forced cam based Triboelectric Nanogenerator |
Date & Time |
2021-07-09 11:15 ~ 11:30 |
Place | 208 |
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Speaker | Dongik Kam | Affiliation | Kyung Hee University |
Title | Development of High Quality Electret for Stable and Improved Electrical Output Performance of Triboelectric Nanogenerator |
Date & Time |
2021-07-09 11:30 ~ 11:45 |
Place | 208 |
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Speaker | Young-Jun Kim | Affiliation | Sungkyunkwan University |
Title | Triboelectrification induced self-powered microbial disinfection using nanowire-enhanced electric field |
Date & Time |
2021-07-09 13:30 ~ 13:45 |
Place | 208 |
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Speaker | Seok June Chae | Affiliation | Korea University |
Title | High piezoelectric properties of (Li, Na, K)(Nb, Sb)O3-CaZrO3 lead-free ceramics and thick-films for piezoelectric multilayer actuator |
Date & Time |
2021-07-09 13:45 ~ 14:00 |
Place | 208 |
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Speaker | Min Gi Chung | Affiliation | KAIST |
Title | Machine Learning-based Self-powered Acoustic Sensor for Speaker Recognition |
Date & Time |
2021-07-09 14:00 ~ 14:15 |
Place | 208 |
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Speaker | Eun Ji Kim | Affiliation | Korea University |
Title | The enhanced piezoelectric properties of <001> textured Pb(Zr,Ti)O3-Pb[(Zn,Ni)1/3Nb2/3]O3 for multilayer actuators |
Date & Time |
2021-07-09 15:15 ~ 15:30 |
Place | 208 |
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Speaker | Minchang Kim | Affiliation | kyunghee university |
Title | Design of Smart Brake System for Triboelectric Effect based Self-powered Mechanical Abrasion Monitoring |
Date & Time |
2021-07-09 15:30 ~ 15:45 |
Place | 208 |
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Speaker | Dong-Min Lee | Affiliation | Sungkyunkwan University |
Title | Dynamic mechanical stimuli communication via switchable ionic polarization |
Date & Time |
2021-07-09 15:45 ~ 16:00 |
Place | 208 |
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Speaker | Sumin Cho | Affiliation | Kyung Hee University |
Title | Triboelectrification-driven Electroporation in a Conductive Cellulose Filter for Self-powered, Portable, and Efficient Water Sterilization |
Date & Time |
2021-07-09 16:15 ~ 16:30 |
Place | 208 |
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Speaker | Yoon Sang Ra | Affiliation | Kyung Hee University |
Title | Triboelectric Nanogenerator with Cold-rolled Metal Layer for Highly Long-term Performance |
Date & Time |
2021-07-09 16:30 ~ 16:45 |
Place | 208 |
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Speaker | Sera Jeon | Affiliation | Sungkyunkwan University |
Title | Stable, High Performance Triboelectric Nanogenerators Using Butylated Melamine Formaldehyde as a Durable and Highly Tribo-positive Friction Layer |
Date & Time |
2021-07-09 16:45 ~ 17:00 |
Place | 208 |
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Speaker | Sunmin Jang | Affiliation | Kyung Hee University |
Title | A Signal Boosting Strategy for Liquid Solid Triboelectric Platform for its Practical Application |
Next Generation Photovoltaics using Nanomaterials and Nanotechnology
This session focuses on the nanomaterials and nanotechnology for the next generation photovoltaics. Over the last decade, thin film photovoltaics based on organic, hybrid, inorganic based materials are rapidly approaching the beginning of the commercial availability. This session addresses the recent developments in the performance of photovoltaics with advanced concepts for the realization of low cost and high efficiency energy devices.
- Nanomaterials and Processes for the Perovskite Solar Cells
- Nanomaterials and Devices for the Organic Photovoltaics- Nanostructured Sensitized and QD based Photovoltaics
- Nanotechnologies for Thin Film and Tandem Solar Cells
Date & Time |
2021-07-08 10:00 ~ 10:30 |
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Place | Online |
Speaker | Yuelong Li |
Affiliation | Nankai Univ., CHINA |
Title | Efficient Perovskite Solar Cells with Interfacial Engineering |
Lecture Summary
Recently, metal halide perovskite solar cells (PSCs) has reached a certificated efficiency of 25.5% within a decade and will definitely keep increasing rapidly to 26%. Among various approaches, the interfacial engineering is the crucial one to maximize the performance of PSCs, which not only can control the interfacial charge extraction properties but also can improve the quality of absorber layer with enlarged grain size and reduced defects. Herein, we will introduce several effective passivating materials and techniques to boost the performance of PSCs. First of all, PTAA, which is commonly used as hole transport layers (HTM), is used as a thin interfacial layer to modify the interfacial properties of PSCs. Secondly, post-treatment with FAI/IPA can effectively rebalance the composition of facial perovskite layer for reduced defects density and better quality. Thirdly, passivating agents containing various functional groups are employed to improve the quality of perovskite absorbers, and the mechanism of those interfacial engineering will be introduced.
Date & Time |
2021-07-08 10:30 ~ 11:00 |
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Place | Online |
Speaker | Yixin Zhao |
Affiliation | Shanghai Jiao Tong University, CHINA |
Title | Inorganic CsPbI3 based perovskite toward efficient photovoltaics |
Lecture Summary
The all-inorganic lead halide perovskite without volatile component would be a promising alternative candidate for high efficiency photovoltaics. However, the all inorganic black phase CsPbI3 face the challenges of low room temperature phase stability and relative low efficiency. To enhance the performance and stability of all-inorganic CsPbI3 perovskite, the 2D/3D configuration was introduced to stabilize the black phase CsPbI3. The 2D based on EDAPbI4 help stabilize black phase CsPbI3 to achieve up to >11% efficiency. Furthermore, a facile organic cation surface termination approach was developed to significantly enhance the stability and performance of α-CsPbI3 solar cell with >15% efficiency. The bifunctional stabilization of CsPbI3 with gradient Br doping and organic cation termination finally improve the efficiency of CsPbI3 perovskite solar cells to a record value of 17% with enhanced stabilities. Recently, a concept new beta phase CsPbI3 with better phase stability push the efficiency up to 19%. In all, the CsPbI3 perovskite would be an ideal candidate for stable and efficient perovskite photovoltaics
Date & Time |
2021-07-08 11:00 ~ 11:30 |
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Place | 205 |
Speaker | Jun Hong Noh |
Affiliation | Korea University, KOREA |
Title | Halide Double Layers for Progress in Perovskite Solar Cells |
Lecture Summary
Halide perovskite solar cells (PSCs) have a typical device structure of thin-film solar cells such as GaAs, CdTe, and CIGS solar cells. The feature point of PSCs is that the thickness of the light-absorbing perovskite layer is much thinner than conventional thin-film solar cells. This requires careful design of local electric field within thin perovskite layer. The electric field can not be only designed by charge-transporting layers at both sides of the perovskite layer but also by the introduction of the interfacial layer between perovskite and CTLs. The formation of halide overlayer on the light-absorbing perovskite layer is a notable strategy to introduce the interfacial layer, which forms a halide double layer. The halide double layer does not only enable to improve power conversion efficiency by the formation of electric field and surface passivation and long-term stability by blocking molecules entering and leaving but can also offer a degree of freedom to choose to appropriate CTL materials on it. In this talk, the strategy of the halide double layer will be introduced, and our related recent results will be discussed.
Date & Time |
2021-07-08 13:00 ~ 13:30 |
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Place | 205 |
Speaker | Phillip Lee |
Affiliation | KIST, KOREA |
Title | 3D printer-based kirigami/origami approach for ultrastretchable photovoltaics with high areal coverage |
Lecture Summary
Stretchability and areal coverage of active devices are key design parameters for wearable or stretchable photovoltaics. Conventional island-bridge structure provides simple but efficient approach for stretchable electronics [1, 2]. However, the trade-off between stretchability and areal coverage is inevitable. All the constraints of traditional island-bridge stem from the fact that stretchable bridge parts and rigid active island parts share limited two-dimensional area.
Three-dimensional arrangement of electronics can enhance the performance of electronic devices. Recent rapid development of 3D printing technology enables three-dimensional design and fabrication of electronic devices with high design flexibility. Recent rapid development of 3D printing techno However, it is still difficult to attain high flexibility and high electric conductivity simultaneously. Flexibility is important for wearable or stretchable applications, and sufficient electric conductivity is also significant to prevent losses.
In this study, we present 3d printer-based fabrication process to attain both high mechanical compliance and electrical conductivity. The suggested process enables ultrastretchable photovoltaics with high areal coverage of active devices. The ultrastretchability and high areal coverage of active devices are achieved with the aid of the conductive 3D-printed kirigami/origami structures.
Date & Time |
2021-07-08 13:30 ~ 14:00 |
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Place | Online |
Speaker | Seigo ITO |
Affiliation | Univ. of Hyogo, JAPAN |
Title | Fabrication and Analysis of Carbon-Based Multi-Porous-Layered-Electrode Perovskite Solar Cells |
Lecture Summary
Organic-inorganic metal halide perovskite solar cells (PSCs) have been improved rapidly, and their photoelectric conversion efficiency (PCE) was increased from 3.8% in 2009 to over 25% in 2020. Since PSCs can be produced easily and inexpensively by simple processes such as printing and coating, the world-wide activities of research and development have been conducted for the commercialization of this technology. However, since the organic substances used in PSCs are unstable with respect to the ambient air, moisture, and heat, there has been a great deal of interest in improving durability, recently. In addition, the components of PSCs, such as hole transport materials (e.g., spiro-OMeTAD) and metal counter electrodes (e.g., Au or Ag), are expensive, and utilization of such materials can be a hindrance for the low-cost PSCs. Using only low-cost materials (without Au, Ag and spiro-OMeTAD), in 2013, the group of Hongwei Han (HUST, Wuhan, China) first reported hole-conductor-free fully-printable multi-porous-layered-electrode perovskite solar cells (MPLE-PSCs). The MPLE-PSCs show extremely high stability against light and heat. In this presentation, the latest progress about MPLE-PSCs will be shown in our group (for example, stability at 120°C for 4500 h, and at 85°C-85%RH for 2000 h).
Date & Time |
2021-07-08 14:00 ~ 14:30 |
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Place | 205 |
Speaker | Jinwook Lee |
Affiliation | Sungkyunkwan University, KOREA |
Title | ‘A’ site cation engineering for efficient and stable perovskite solar cells |
Lecture Summary
Metal halide perovskites (MHPs) for photovoltaic applications have the general stoichiometry formula of ABX3, with A as the monovalent organic or inorganic cation, B as the divalent lead or tin cation, and X as the halide anion. The A cation itself does not directly contribute to the band edge states. However, the A cation was found to significantly influence the physical, chemical, and optoelectronic properties of MHPs. Resultingly, engineering of the A cation has enabled important breakthroughs to enhance the performance and stability of perovskite solar cells (PSCs). In this presentation, I will report novel ‘A’ site cation engineering strategies for enhancing power conversion efficiencies (PCEs) and stability of the PSCs. Incorporation of over- or under-sized ‘A’ was found to induce strain in the bulk lattice of the MHPs, allowing for modulation of ion migration energetics in the bulk lattice. We demonstrate the induced strain can enhance the activation energy barrier for ion migration to significantly improve operational stability of the PSCs. In addition, I will also report utilization of bulky organic cationsto passivate surface defects of the MHP thin films. The rational strategies for maximizing the surface passivation effects with minimized side effects will be presented.
Date & Time |
2021-07-08 14:30 ~ 15:00 |
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Place | 205 |
Speaker | Hui-Seon Kim |
Affiliation | Inha University, Republic of Korea |
Title | Synergistic Effect of Mixed-Salt Passivation toward Efficient and Stable Perovskite Solar Cell |
Lecture Summary
A synergistic passivation mechanism of a mixed-salt treatment through surface reconstruction engineering is unraveled. This strategy reduces defects and suppresses ion migration of the perovskite interface, leading to an enhanced photovoltaic performance meanwhile presenting outstanding operational stability. More generally, the proposed mixed-salt system provides a wider way of designing functional passivation materials which gets benefits from its synergistic effect.
Date & Time |
2021-07-09 10:00 ~ 10:30 |
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Place | 205 |
Speaker | Jongchul Lim |
Affiliation | Chungnam National University, KOREA |
Title | Understanding the charge carrier transport within metal halide perovskites via transient methods |
Lecture Summary
In addition to mobile electrons and holes, the mobile ions in metal halide perovskites redistribute under an applied electric field. It negates many benefits of standard spectroscopic techniques to quantify mobility, such as nanosecond to millisecond transient methods, time-of-flight and space charge limited current measurements. Indeed, an accurate estimation of charge carrier density is hindered by early-time recombination, the branching ratio of excitons to free-carriers and sensitivity to short-range conductivity. It is also important to understand the long-range charge transport within the metal halide perovskite for optimisation of operating devices, where the charges have to travel over on the order of microns, and if these properties change in different carrier density regimes, or through different methods of processing the films. Here this presentation introduces applied methodologies and also highlights an advanced optical and electrical methodologies: Photoinduced transmission and reflection (PITR), Transient photoconductivity (TPC) and Pulsed-voltage space charge limited current (PV-SCLC). With these methods, we accurately estimated the internal free-carrier density during photo-excitation, accounting for both early-time recombination and exciton-to-free-carrier branching ratios to determine long-range charge carrier mobility in metal halide perovskite thin films and single crystals, to be reliable value over many orders of magnitude of charge density. We believe this study is the accurate evaluation of photo-induced long-range mobility of metal halide perovskites, and therefore represents a powerful handle for future optimisation of perovskite solar cells and optoelectronic devices.
Date & Time |
2021-07-09 10:30 ~ 11:00 |
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Place | 205 |
Speaker | Kyungkon Kim |
Affiliation | Ewha Womans University, KOREA |
Title | Formation of stable heterojunction by sequential solution deposition of conjugated polymer and small molecule |
Lecture Summary
With rapid advances in the development of new conjugated polymers, non-fullerene acceptors, the power conversion efficiency (PCE) of organic photovoltaics (OPVs) has been increased over 17%. However, a major drawback for the commercialization of OPVs is their long-term stability under continuous operation. Especially, OPVs suffer from a rapid decrease in PCE during initial device operation, which is known as the “burn-in loss”. It is considered that the origin of the burn-in loss is mainly related with the instability of the heterojunction morphology at bulk and/or interface. In this contribution, I would like to introduce a strategy to improve heterojunction morphology through the construction of heterojunction by sequential deposition of conjugated polymer donor and conjugated small molecule acceptor.
Date & Time |
2021-07-09 11:00 ~ 11:30 |
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Place | 205 |
Speaker | Dong Hoe Kim |
Affiliation | Sejong University, KOREA |
Title | 2-Dimensional Additive Engineered Perovskite for Highly Efficient Tandem Solar Cells |
Lecture Summary
The tandem solar cells, which based on dual junctions combining wide-bandgap top cells (e.g., ~1.7–1.9 eV) and narrow-bandgap bottom cells (e.g., ~0.9–1.3 eV) are considered as an effective strategy to overcome the Schokley-Queisser (S-Q) limit (~31-33%) of single-junction solar cells. Organic-inorganic metal halide perovskite (PVSK) materials is one of the most promising candidates for the top- and bottom-cell in tandem devices (e.g., PVSK/PVSK, PVSK/Cu(In,Ga)Se2 (CIGS), and PVSK/Si) owing to their flexible bandgap-tunability, low-cost processing, and various
formation routes like spin-coating, blade-coating, vacuum deposition. One of the critical challenges in developing tandem devices using perovskite is to prepare highly efficient wide- or narrow-bandgap perovskite solar cells (PSCs) for top- and bottom-cells, respectively. Among the various efforts such as composition engineering, morphology control, contact layer improvement, and defect passivation for improving the performance of PSCs, the formation of a 2-dimensional (2D) passivation layer using large organic cations (e.g., butylammonium or phenethylammonium) have been considered one of the most promising approaches. However, some challenges have led to lower performance in 3D/2D mixed PVSK due to the limitation of charge transport caused by the long and bulky organic cation from the 2D passivation layer. This presentation introduces the various strategies like cation/anion engineering in 2D parts and dipole engineering to demonstrate a highly efficient 3D/2D PSCs with various bandgap (1.23 eV and 1.68 eV). Based on our strategies, we finally demonstrated highly efficient and stable PVSK based tandem solar cells with various kinds of bottom cells combination like Perovskite, CIGS, and Si.
Date & Time |
2021-07-08 11:30 ~ 11:45 |
Place | 205 |
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Speaker | Min-Jae Choi | Affiliation | Dongguk University |
Title | Ligand exchange strategy for high-efficient colloidal quantum dot solar cells |
Date & Time |
2021-07-08 15:00 ~ 15:15 |
Place | 205 |
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Speaker | Sunho Lee | Affiliation | SungKyunKwan University |
Title | Impacts of Acid Dissociation Constant on Defect Passivation in Perovskite Solar Cell |
Date & Time |
2021-07-08 15:15 ~ 15:30 |
Place | 205 |
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Speaker | Keonwoo Park | Affiliation | Sungkyunkwan University |
Title | Interplay of humidity and methylammonium chloride for highly efficient FAPbI3 perovskite solar cells |
Date & Time |
2021-07-09 11:30 ~ 11:45 |
Place | 205 |
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Speaker | In Seok Yang | Affiliation | Sungkyunkwan University |
Title | Synergistic Effect of Dual-Additive Engineering for Improvement of Photovoltaic Performance and Stability of Perovskite Solar Cell |
Date & Time |
2021-07-09 11:45 ~ 12:00 |
Place | 205 |
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Speaker | MA Chunqing | Affiliation | Sungkyunkwan University |
Title | Photovoltaic and triboelectric coupled effect in dynamic halide perovskite heterojunction devices |
Date & Time |
2021-07-09 12:00 ~ 12:15 |
Place | 205 |
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Speaker | Dong-Ho Kang | Affiliation | Sungkyunkwan University |
Title | Iodine-bearing passivation agent improves photovoltaic performance of perovskite solar cells |
Next generation Batteries using Nanomaterials and Nanotechnology
Lithium-ion batteries are necessity in a variety of applications ranged from consumer electronics to electric vehicles and grid-based energy storage systems. This session is focused on next generation batteries using nanomaterials and nanotechnology to improve the performance and energy density. Therefore, the presentations will share recent progress and prospect in the wide range topics of next generation batteries from the design of next-generation electrode and electrolytes materials, and cell shape/configurations to the improvement in performance of batteries.
- Lithium metal batteries: Li-air, Li-sulfur battery
- All solid-statebatteries: polymer, inorganic and hybrid electrolytes, bipolar system
- Redox flow batteries
- Multivalent Batteries
-Various shape of batteries
Date & Time |
2021-07-08 13:15 ~ 13:45 |
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Place | Online |
Speaker | Fujun Li |
Affiliation | Nankai University, CHINA |
Title | Photo-involved Li-O2 batteries |
Lecture Summary
Graphitic C3N4 is prepared to work as a bifunctional photocatalyst for Li-O2 battery to accelerate formation and decomposition of Li2O2 under UV light irradiation. At 0.04 mA cm-2, the discharge voltage of Li-O2 battery is significantly increased to 3.22 V, surpassing the thermodynamic limit of 2.96 V, and the charge voltage is reduced to 3.38 V. After the plasmonic Au nanoparticles (NPs) are loaded onto nitrogen-deficient C3N4 to form Au/NV-C3N4 heterojunction, its absorption and carrier lifespan are significantly enhanced to visible light and prolonged. The achievable discharge voltage of Au/NV-C3N4 reaches 3.16 V, surpassing the equilibrium voltage by 200 mV; the charge voltage was decreased to 3.26 V at 0.05 mA cm-2, corresponding to an ultrahigh round-trip efficiency of 97.0%. The superior battery performances are rewarded by the plasmon-induced hot electron transfer from Au to NV-C3N4 and good matching of carrier lifespan with oxygen redox kinetics on Au/NV-C3N4. At the same time, metal-organic polymer nanosheets of Co-TABQ as a cathode catalyst promote formation and oxidation of Li2O2 under visible light. It was revealed that Co atoms of Co-TABQ are oxygen reduction sites. During discharge, O2 is adsorbed on the Co atoms and reduced to LiO2 by accepting electrons in its π2p* orbitals from the dz2 and dxz orbitals of Co atoms of the illuminated Co-TA BQ, and it then transforms to the final product of Li2O2. Upon charging, the holes in the VB of the illuminated Co-TABQ oxidize Li2O2 to Li+and O2 without intermediates with an applied voltage.
Date & Time |
2021-07-08 14:15 ~ 14:45 |
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Place | 206 |
Speaker | Hee Tak KIM |
Affiliation | KAIST, KOREA |
Title | Achieving Reversible Zn electrode by Interfacial Engineering |
Lecture Summary
Aqueous zinc-based flow batteries are an attractive option for energy storages system due to their inflammability and high energy density. However, Zn dendrite formation, which causes internal short circuit and capacity drop, limits long-term operation of Zn-based batteries. Uncontrolled Zn nucleation/growth or Zn-ion transport leads to inhomogeneous Zn reaction and triggers dendritic Zn growth. In this aspect, advanced engineering of the Zn/substrate and Zn/electrolyte interface, which can control these processes, is strongly demanded. In this talk, we present that an atomistic-designed carbon current collector and a structured interlayer on Zn electrode can control these interfacial processes for inducing dendrite-free Zn deposition. By experimental and computational analysis, the working mechanism of the advanced interfaces is elucidated. The performances and durability of the Zn batteries exploiting the advanced interfaces demonstrate the efficacy of the advanced interfacial engineering on achieving reversible Zn electrode.
Date & Time |
2021-07-08 15:15 ~ 15:45 |
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Place | 206 |
Speaker | Sang-Young Lee |
Affiliation | Yonsei University, KOREA |
Title | Nanoprinted Artistic Power Sources |
Lecture Summary
The ongoing surge in demand for flexible/wearable electronics, self-powered systems, soft robotics, and Internet of Things (IoT) has inspired the relentless pursuit of form factor-free, high-performance power sources that can be monolithically and seamlessly integrated with various electronic devices. From the viewpoint of cell design and architecture, conventional assembly and materials have pushed the power sources to lack of variety in form factors, thus imposing formidable challenges on their integration into versatile-shaped electronic devices. This talk describes a new class of nanoprinted artistic power sources, with particular attention to their design diversity and performance compatibility with newly emerging complex-structured electronic devices. The printed power sources are fabricated directly on arbitrary objects of complex geometries through a variety of simple, low-cost and scalable nanoprinting processes. Their salient features include various form factors, shape conformability, and monolithic integration with devices of interest. A key-enabling technology for the nanoprinted power sources is the design of battery inks (in particular, electrode and electrolyte inks), with a focus on their rheology and electrochemistry. Our research interests are directed to discussing effects of the battery inks on printing processability, nanostructure (focusing on bicontinuous ion/electron transport channels), artistic versatility, and electrochemical performance of the resulting nanoprinted power sources. We envision that the nanoprinted power sources open a new avenue towards form factor-free/monolithic integrated power sources with object-tailored design versatility and dimensional conformability.
Date & Time |
2021-07-09 10:30 ~ 11:00 |
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Place | Online |
Speaker | Yan Yao |
Affiliation | University of Houston, USA |
Title | Cobalt-free All-Solid-State Lithium Batteries and Air-free Vessels for Operando Diagnosis |
Lecture Summary
All-solid-state lithium batteries (ASSLBs) have the potential to increase energy density, improve safety, and allow for lower manufacturing costs compared to conventional, liquid-based Li-ion batteries. In this talk, I will first present cobalt-free solid-state Li batteries using 50 um-thick sulfide-based solid electrolyte (SE). We demonstrate a high-energy ASSLB using an organic cathode material. The use of organic materials in ASSLBs brings many new possibilities to the technology due to their unique feature set of material availability, mechanical properties, electrode reaction characteristics. Furthermore, the thickness of SE layer dictates the cell-level energy density and it is desirable to make the SE layer as thin as possible while maintaining uniformity and defect-free. We show a strong correlation between the solid loading of dispersions and the quality of tape-casted thin SE films. We developed an imaging technique to characterize large areas of films and to quantify their quality by using histograms of the tonal contrast within the images. Stable cycling of Li metal could be realized when inserting a unique designed interlayer in between solid electrolyte and Li metal. In the second half of this talk, I will present an air-free vessel design for operando diagnosis of ASSLBs. The vessel is equipped with a micro-cell mount where electrochemical tests are performed in situ. Heating and pressure applying/sensing modules are also integrated in the platform. The air-free design allows transfer of an air-sensitive ASSLBs between different analytical instruments. We demonstrate successful operando characterizations of microstructures under electron microscopy and optical microscope. A consolidated in situ structural-chemical-mechanical diagnostic platform is under development that will provide unprecedented insights into the failure mechanisms of ASSLBs.
Acknowledgment: This work is supported by the U.S. Department of Energy’s Office of Energy Efficiency and Renewable Energy (EERE) under the Vehicle Technologies Program under Contract DE-EE0008234 and DE-EE0008864 (Program manager: Tien Duong).
Date & Time |
2021-07-09 11:30 ~ 12:00 |
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Place | Online |
Speaker | Fu-Ming Wang |
Affiliation | NTUST, Taiwan |
Title | Investigations of The Polymer Brush Modified Structured Silicon in The Hydrogen-Bonding Effect as an Anode Material in Lithium-Ion Batteries |
Lecture Summary
Silicon (Si) has the maximum capacity (> 4000 mAh g-1) compares with the conventional graphite (300-350 mAh g-1), which can dramatically increase the energy density of the battery. However, due to some drawbacks on Si material such as electrochemical irreversibility and volume expansion on alloy reaction, pure Si cannot be used in large quantities in the anode electrode, approximately 3~8 wt% only in commercial products. In this research, a novel method for pure Si material has been developed, a polymer brush modified core-shell structure (PBCS) by hydrosilylation reaction on Si nanoparticles. According to the results, the PBCS structure provides three significant functions on Si particles because of the effects of hydrogen bonding such as good dispersion in the slurry, a protection during cycling, and excellent conductivity for high-rate tests. The polymer brush is fabricated by the acrylic acids in which the hydrogen bonding effects between each carbonyl groups are used to enhance lithium-ion diffusion and the adjustment of attraction and repulsion in between particles. The PBCS Si electrode shows the first columbic efficiency is 87.1%, the retentions are 92.5% (0.1C/ 0.1C) for 200 cycles and 86.2% (0.5C/ 0.5C) for 400 cycles, respectively. The TEM and TXM results display that the PBCS structure significantly protects the nano Si from cracking owing to the high elastic function. Operando measurements such as GCMS and XRD demonstrate that the PBCS significantly inhibits gas evolution and non-crystallinity formation during cycling. This research shows this novel PBCS Si no longer needs electrolyte additives and another surface coating for preventing those drawbacks in previously mentioned. With this novel PBCS Si material, a high energy density lithium-ion battery contains pure Si or a higher amount of Si can be expected.
Date & Time |
2021-07-09 13:15 ~ 13:45 |
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Place | Online |
Speaker | Young-Hye Na |
Affiliation | IBM Almaden Research Center, USA |
Title | A Fast-Charing, Lithium Metal Battery based on a Heavy-Metal Free Cathode |
Lecture Summary
Electrifying transportation systems to reduce our dependence on fossil fuels is a critical priority to address climate change, and more powerful and affordable batteries are key to accelerate the adoption of zero-emission electric vehicles (EV). Recently, we developed a stable, fast-charging battery that comprises i) a lithium metal anode, ii) a heavy-metal free cathode involving iodide conversion reactions, and iii) a stable liquid electrolyte with high flash point. The unique combination of these materials has demonstrated remarkable performance including outstanding power density, fast charging time, and prolonged cycle life, surpassing conventional lithium-ion batteries. In this talk, the fundamental electrochemistry and interfacial phenomenon responsible for this new battery system’s excellent performance will be discussed along with our strategies to accelerate the process of further improvement and optimization of this battery system.
Date & Time |
2021-07-09 14:15 ~ 14:45 |
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Place | 206 |
Speaker | Jeomsu Kim |
Affiliation | Donga University, KOREA |
Title | Applying NCM Precursors with Co-rich Surface for the Positive Electrode Material in Fast Charging Li-ion Batteries |
Lecture Summary
A charging time is one of the key features of the batteries which is used in electric vehicles (EV). One must apply larger current to fill the same energy to reduce the charging time because the amount of applying current is inversely proportional to the charging time. It is necessary to ensure rapid kinetics of electrode materials for accommodate the massive Li flux. Improving charging characteristics of cathode materials has been intensively studied by our research group using the most popular materials, NCM series. The shape of NCM particle was designed with core-shell structure with different composition, which is the Ni-rich core and the Co-rich shell. In this talk, we present that unique shape of precursors with Co-rich surface resulted to the large surface area and lower Ni to Co ratio surface of active materials. These active materials show superior electrochemical performance to the normal NCM materials under the fast-charging condition.
Date & Time |
2021-07-09 15:00 ~ 15:30 |
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Place | Online |
Speaker | Zhong-Shuai Wu |
Affiliation | Chinese Academy of Sciences, CHINA |
Title | 2D materials for micro-electrochemical energy storage devices |
Lecture Summary
Micro-electrochemical energy storage devices with in-plane geometry, e.g., micro-supercapacitors (MSCs) and micro-batteries (MBs), are a new class of miniature energy storage devices for various microelectronics. Two dimensional (2D) materials with the advanced merits of ultrathin flat structure, high specific surface area, and excellent mechanical characteristics, are one of the perfect candidates for planar MSCs and MBs matching well with the in-plane geometry to boost the performance. In this talk, our recent progress on 2D materials based planar micro-electrochemical energy storage devices will be reported. First, high capacitance 2D materials of such as electrochemical exfoliated doped graphene, MXene, metal oxides and mesoporous polymers are successfully prepared by the strategies of electrochemical exfoliation, liquid exfoliation, graphene template, and supramolecular self-assembly methods. Second, high-performance MSCs and MBs for different integrated systems are further explored. Via modulating highly stable and conducting 2D materials (e.g., graphene, MXene)-based inks with outstanding rheological, electrical and electrochemical properties, the planar integrated MSCs and MBs are fabricated via a universal, cost-effective, industrially applicable screen-printing strategy. The highly conductive inks can be used as current collectors, microelectrodes and interconnects simultaneously, and the all-solid-state planar integrated MSCs can achieve ultrahigh output current/voltage through series or parallel connection. Moreover, planar integrated microscale energy storage systems with different application scenarios are exploited, like the prototype planar integrated system of MSC and NH3 sensor, the all-flexible MXene-based self-powered integrated system composed of a tandem thin-film silicon solar cell, a MXene-Lithium ion MBs or a MXene-MSCs, and a MXene hydrogel pressure sensor on a co-planar substrate. The MXene-based self-powered integrated system is demonstrated that sensitively monitors the bending of body movement with a fast response of 35 ms. What’s more, this type of electrochemical microdevices integrates energy generation/harvests, energy storage, and energy consumption in one system, and can be widely used in many demands.
Date & Time |
2021-07-08 13:00 ~ 13:15 |
Place | 206 |
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Speaker | Man Li | Affiliation | Gachon University |
Title | HKUST-1@IL-Li Solid-state Electrolyte with 3D Ionic Channels and Enhanced Fast Li+ Transport for Lithium Metal Batteries at High Temperature |
Date & Time |
2021-07-08 13:45 ~ 14:00 |
Place | 206 |
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Speaker | Abin Kim | Affiliation | POSTECH |
Title | Improved Li ion conductivity of single-doped LLZO through site control |
Date & Time |
2021-07-08 14:00 ~ 14:15 |
Place | 206 |
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Speaker | Hyun Deog Yoo | Affiliation | Pusan National University |
Title | Corrosion Rate of Zinc Metal Electrodes in Aqueous Electrolytes |
Date & Time |
2021-07-08 14:45 ~ 15:00 |
Place | 206 |
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Speaker | Yongku Kang | Affiliation | 한국화학연구원 |
Title | Macroporous carbon nanofiber as free-standing cathodes for High performance Li-O2 battery |
Date & Time |
2021-07-08 15:00 ~ 15:15 |
Place | 206 |
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Speaker | Woo-Jin Song | Affiliation | Chungnam National University |
Title | Deformable Energy Devices based on Polymeric Materials for Wearable Electronics |
Date & Time |
2021-07-09 10:15 ~ 10:30 |
Place | 206 |
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Speaker | Ilhwan Kim | Affiliation | Korea Institute of Machinery and Materials |
Title | Nanocarbon Coating Layer on Nanostructured Copper Sulfide-Metal Organic Framework Derived Carbon for SIB |
Date & Time |
2021-07-09 11:00 ~ 11:15 |
Place | 206 |
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Speaker | Hyun-Kyung Kim | Affiliation | Kangwon National University |
Title | Surface modifications of nanocarbons for energy storage devices |
Date & Time |
2021-07-09 11:15 ~ 11:30 |
Place | 206 |
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Speaker | Heechul Jung | Affiliation | Dong-A University |
Title | Surface-treatment of silicon carbon composite as anode materials for lithium-ion batteries |
Date & Time |
2021-07-09 13:45 ~ 14:00 |
Place | 206 |
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Speaker | Minkyung Kim | Affiliation | Kwangwoon University |
Title | Revealing relationships between surface facets and performance of LiNiO2 cathodes |
Date & Time |
2021-07-09 14:00 ~ 14:15 |
Place | 206 |
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Speaker | Won-Hee Ryu | Affiliation | Sookmyung Women's University |
Title | Super-Expanded Graphite Anodes Employing Diverse Metallic Pillars for High Capacity Na-ion Batteries |
Date & Time |
2021-07-09 14:45 ~ 15:00 |
Place | 206 |
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Speaker | Vikram Singh | Affiliation | Korea Advanced Institute of Science and Technology |
Title | Azo-integrated Covalent Organic Frameworks as Electrodes for Lithium-ion Batteries |
Nanomaterials and nanotechnology for electrocatalytic solar fuel generation
Electrochemical energy conversion reactions, such as H2 evolution reaction, O2 evolution reaction, CO2 reduction reaction, O2 reduction reaction, and N2 reduction reaction have been extensively explored as promising approaches for constructing an environmental‐benign energy circulation. Using electricity from renewable sources, most probably solar energy, the electrochemical process can be driven to convert universal feedstocks, for example, H2O, CO2, O2, and N2, to value‐added fuels and chemicals. In this way, the electricity from renewable source can be stored in chemical bonds and readily extracted to sustainable electrical energy via fuel cell systems at any time. This session covers the development of state‐of‐the‐art electrocatalysts and photocatalysts, the prime importance to enhance the kinetics, efficiency, and selectivity of each electrochemical energy conversion reactions.
- Water splitting
- CO2 reduction
- N2 reduction
- Photoctalysts
- Photoelectrochemical
- Electrocatalysts
Date & Time |
2021-07-07 09:00 ~ 09:30 |
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Place | Online |
Speaker | Thomas Moffat |
Affiliation | NIST, USA |
Title | Electrochemical Atomic Layer Deposition and Alloy Formation |
Lecture Summary
Recently, an inexpensive “wet form” of Atomic Layer Deposition (ALD) based on self-terminated electrodeposition reactions was uncovered that enables controlled formation of ultrathin films of Pt, Ir and iron group metals and alloys of interest to the development of a H2 economy. Common to all these systems is the role of reaction intermediates, namely adsorbed H or OH-, in the quenching of metal deposition reactions. Details on the mechanisms of self-terminated deposition including its application to different substrates will be discussed. Likewise, the utility of potential controlled electrodeposition to form ultrathin alloy films based on excess bond enthalpy of alloying will also be detailed. The utility and relevance of the above processes to the synthesis of nanoparticles and thin films, and the study of bimetallic electrocatalysts will be outlined.
Date & Time |
2021-07-07 09:30 ~ 10:00 |
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Place | Online |
Speaker | Kyoung Shin Choi |
Affiliation | UW Madison, USA |
Title | Understanding the Surface Effects of Ternary Oxide Photoelectrodes Using BiVO4 as a Model System |
Lecture Summary
Photoelectrochemical water splitting presents an attractive strategy to produce hydrogen gas as an alternative clean fuel in an environmentally benign and sustainable manner. The key component of a photoelectrochemical cell is a semiconductor electrode (photoelectrode) that absorbs solar light to generate, separate, and transport charge carriers to the semiconductor/electrolyte interface to participate in desired chemical reactions. The electron-hole separation and interfacial charge transfer of the photoelectrode are considerably affected by the interfacial energetics between the photoelectrode and the electrolyte and/or between the photoelectrode and the buffer, protection, or catalyst layers; hence, the interfacial properties of a photoelectrode are as important as the bulk properties of the photoelectrode.
To date, strategies for altering the atomic arrangement at the photoelectrode surface that do not involve extrinsic doping have mainly involved changing the semiconductor surface facets. However, for ternary oxide photoelectrodes with a formula of AxByOz, there exist numerous ways to terminate the surface even for the same facet. For example, the surface can be terminated with A-O or B-O, and the surface A:B ratio may be different from the bulk A:B ratio. In fact, if not grown as single crystals, AxByOz photoelectrodes can have an A-rich or B-rich surface depending on the synthesis method, which can affect their photoelectrochemical properties. However, despite being important and ubiquitous, the effects of surface termination/composition on a ternary oxide photoelectrode have not been systematically studied, and the atomic origin of their effects on interfacial energetics and photoelectrochemical properties have not been elucidated.
In this presentation, we will discuss the effects of surface termination/composition on the interfacial energetics and photoelectrochemical properties of photoanodes using BiVO4 as an example. We will compare epitaxially grown BiVO4 photoelectrodes with V-rich and Bi-rich (010) exposed facets and demonstrate that the surface Bi:V ratio has a considerable effect on the surface energetics and photocurrent generation of BiVO4 even for the same (010) facet.
Date & Time |
2021-07-07 13:00 ~ 13:30 |
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Place | Online |
Speaker | KUDO Akihiko |
Affiliation | Tokyo Univ. of Science, JAPAN |
Title | Water splitting and carbon dioxide reduction using photocatalysts |
Lecture Summary
Photocatalytic water splitting is a challenging reaction because it is an ultimate solution to resources, energy, and environment issues. Photocatalytic CO2 fixation has also attracted attention. These can be regarded as artificial photosynthesis, because light energy is converted to chemical energy. In the present paper, I introduce various metal oxide and sulfide photocatalysts for the water splitting and CO2 reduction.
AgTaO3 and Na0.5Bi0.5TiO3 of valence-band-controlled metal oxide photocatalysts gave 40% at 340 nm and 5.1% at 350 nm of apparent quantum yields, respectively. SrTiO3:Rh and several metal sulfides of a H2-evolving photocatalyst and BiVO4 of an O2-evolving photocatalyst constructed various type of Z-schematic photocatalyst systems with Fe3+/Fe2+, [Co(bpy)3]3+/2+, and a conductive reduced graphene oxide (RGO) as an electron mediator, and even without an electron mediator. Ag cocatalyst-loaded ALa4Ti4O15 (A = Ca, Sr, and Ba) and tantalates photocatalysts such as NaTaO3:Ba with 3.79–4.1 eV of band gaps show activities for CO2 reduction to form CO and HCOOH in an aqueous medium. We also constructed a Z-scheme system using CuGaS2 of a CO2-reducing photocatalyst with BiVO4 of an O2-evolving photocatalyst and RGO of an electron mediator for CO2 reduction using water as an electron donor.
Date & Time |
2021-07-07 13:30 ~ 14:00 |
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Place | Online |
Speaker | Yanguang Li |
Affiliation | Soochow University, CHINA |
Title | Engineering conjugated polymers for photocatalytic water splitting |
Lecture Summary
Conjugated polymers have recently emerged as promising candidates for photocatalytic H2 production owing to their structural designability and functional diversity. However, limited by the fast recombination of photoexcited electrons and holes, their H2 production rates usually fall far behind expectations. To this end, we for the first time design molecular heterostructures of covalent triazine frameworks to facilitate the charge carrier separation and promote the photocatalytic H2 production. Benzothiadiazole and thiophene moieties are selectively incorporated into the covalent triazine frameworks as the electron-withdrawing and electron-donating units respectively via a rationally designed sequential polymerization strategy. Resultant hybrids exhibit much improved charge carrier separation efficiency as evidenced by a range of photophysical and electrochemical characterizations. Most impressively, a significant H2 evolution rate of 6.6 mmol g-1h-1 is measured for the optimal sample under visible light irradiation (λ>420 nm), which is far superior to most other conjugated polymer photocatalysts reported in literature.
Date & Time |
2021-07-07 14:00 ~ 14:30 |
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Place | Online |
Speaker | Lianzhou Wang |
Affiliation | University of Queensland, AUSTRALIA |
Title | Designing semiconductor nanomaterials for photoelectrochemical energy conversion |
Lecture Summary
Semiconductor materials hold the key for efficient photocatalytic and photoelectrochemical water splitting. In this talk, we will give a brief overview of our recent progress in designing semiconductor nanomaterials for photoelectrochemical energy conversion including solar hydrogen generation. In more details, we have been focusing on a couple of aspects; 1) band-gap engineering, facet and oxygen vacancy control of low-cost metal oxide based semiconductors including TiO2, Fe2O3, BiVO4 and Cu2O for new photoelectrode design, and 2) the combination of high performance photoelectrodes with hybrid perovskite solar cells towards unassisted water splitting process with solar-to-hydrogen conversion efficiency of >6.5%. The resultant material systems exhibited efficient photocatalytic performance and improved power conversion efficiency in solar cells, which underpin sustainable development of solar-energy conversion application.
Date & Time |
2021-07-08 10:00 ~ 10:30 |
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Place | 207 |
Speaker | Byoung Koun Min |
Affiliation | KIST, KOREA |
Title | CIGS thin film photovoltaic technology for solar-chemical production |
Lecture Summary
Solar-chemical production inspired from nature has attracted substantial attention due to a need for developing sustainable future energy as well as chemical resources. In order to achieve a highly efficient solar energy to chemical conversion device using CO2 and water as feedstock the development of several important components such as photoelectrode, catalytic electrodes, membrane, etc. is required. Among them, this lecture focuses on a Cu(InxGa1-x)(SySe1-y)2 (CIGS) thin film photovoltaic technology, which is a very attractive candidate for photoelectrode application of solar-chemical production system because they are durable enough and cost effective with high efficiency. To make the CIGS photovoltaics more cost effective solution processed CIGS thin film preparation has been suggested and developed. In spite of several successful demonstrations most solution based methods resulted in lower photovoltaic performance than vacuum based counterpart to date. In this presentation several strategies for realizing highly efficient and useful solution processed CIGS thin film photovoltaics will be introduced. They include multi-stage paste coating method, doping method, and nanostructuring method that have been being developed in our laboratory.
Date & Time |
2021-07-08 13:00 ~ 13:30 |
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Place | 207 |
Speaker | Jin-Woo Lee |
Affiliation | KAIST, KOREA |
Title | Atomically Dispersed Electrocatalysts for Low Temperature Fuel Cells and Water Electrolysis |
Lecture Summary
It is of great importance to reduce the amount of noble metals in the chemical industry. In this sense, single atom or atomically dispersed catalysts have attracted much attention due to high metal utilization and unique catalytic property. In this presentation, we will show a combination of density functional theory (DFT) and experimental approaches to explore the stability and electrocatalyic activity of a wide range of metal single atoms on a TiC support. We also tuned and enhanced the activity of Fe-N-C, atomically dispersed electrocatalyst, by givign the effect of electron withdrawing/donating functionalities.
Date & Time |
2021-07-08 14:00 ~ 14:30 |
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Place | 207 |
Speaker | Hwang Seong-Ju |
Affiliation | Yonsei University, KOREA |
Title | 2D inorganic nanosheet-based hybrid photo-/electro-catalysts |
Lecture Summary
The monolayered 2D nanosheets of layered inorganic solids (layered metal oxides, layered double hydroxides, layered metal chalcogenides, and graphene) have attracted intense research interest as versatile precursors for synthesizing highly efficient hybrid catalysts applicable for renewable energy technologies. A great diversity in the chemical compositions and crystal structures of 2D inorganic nanosheets provides these materials with a wide spectrum of physical properties and functionalities. The monolayered 2D inorganic nanosheets can be synthesized by soft-chemical exfoliation reaction of the pristine layered materials and used as building blocks for exploring high-performance hybrid photocatalysts and electrocatalysts. In the resulting hybrid catalysts, these 2D nanosheets act as catalytically active components and/or conductive additives for improving the catalyst performances. In this talk, several examples of monolayered 2D nanosheet-based photocatalysts and electrocatalysts will be presented together with the relationship between catalyst performance and chemical bonding nature.
Date & Time |
2021-07-07 10:00 ~ 10:15 |
Place | 207 |
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Speaker | Tae-Ha Gu | Affiliation | Ewha Womans University |
Title | Fine-control of the intersheet distance and electronic coupling between 2D nanosheets to establish design principles for hybrid photocatalysts |
Date & Time |
2021-07-07 10:15 ~ 10:30 |
Place | 207 |
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Speaker | Nam Hee Kwon | Affiliation | Yonsei University |
Title | Co-hybridization with reduced graphene oxide and RuO2 nanosheet as an effective route to high-performance hybrid photocatalysts |
Date & Time |
2021-07-07 10:30 ~ 10:45 |
Place | 207 |
---|---|---|---|
Speaker | Xiaoyan Jin | Affiliation | Yonsei University |
Title | Beneficial role of crystal defect control in exploring high-performance hybrid electrocatalysts |
Date & Time |
2021-07-07 10:45 ~ 11:00 |
Place | 207 |
---|---|---|---|
Speaker | Jin Hyuk Cho | Affiliation | Korea University |
Title | Metal Organic Frameworks as Promising Electrochemical CO2 Reduction Reaction Catalyst |
Date & Time |
2021-07-07 11:00 ~ 11:15 |
Place | 207 |
---|---|---|---|
Speaker | Seongbeen Kim | Affiliation | KAIST |
Title | Interaction Mediator Assisted Synthesis of Mesoporous Molybdenum Carbide: Mo-Valence State Adjustment for Optimizing Hydrogen Evolution |
Date & Time |
2021-07-07 11:15 ~ 11:30 |
Place | 207 |
---|---|---|---|
Speaker | Seungkyu Kim | Affiliation | GIST |
Title | Co-catalytic Effect of Bi-based Metal-organic Framework on BiVO4 Photoanodes for Photoelectrochemical Water Splitting |
Date & Time |
2021-07-07 11:30 ~ 11:45 |
Place | 207 |
---|---|---|---|
Speaker | Jeongsu Lee | Affiliation | Gwangju Institute of Science and Technology |
Title | Bendable BiVO4/WO3 Photoanodes on a Metal Substrate with Template Engineering for Solar-driven Water Splitting |
Date & Time |
2021-07-07 11:45 ~ 12:00 |
Place | 207 |
---|---|---|---|
Speaker | Hojoong Choi | Affiliation | Gwangju Institute of Science and Technology |
Title | A record long-term stability of organometal halide perovskite-based photocathode achieved by MoS2/Ti foil encapsulation layer |
Date & Time |
2021-07-08 10:30 ~ 10:45 |
Place | 207 |
---|---|---|---|
Speaker | SU-IL IN | Affiliation | Daegu Gyeongbuk Institute of Science & Technology (DGIST) |
Title | Solar Fuels: Highly Stable and Selective Gas-phase Photocatalytic CO2 Reduction |
Date & Time |
2021-07-08 11:00 ~ 11:15 |
Place | 207 |
---|---|---|---|
Speaker | Woo-Jae Lee | Affiliation | Pusan National University |
Title | Synthesis of Highly Dispersed and Dense Pt catalyst using Fluidized Bed Reactor Atomic Layer Deposition |
Date & Time |
2021-07-08 11:15 ~ 11:30 |
Place | 207 |
---|---|---|---|
Speaker | Min-Ju Choi | Affiliation | Seoul National University |
Title | Enhanced Photoelectrochemical Properties of Fe2O3/BiVO4/WO3 Heterostructure Photoanode by Controlling the Thickness |
Date & Time |
2021-07-08 11:30 ~ 11:45 |
Place | 207 |
---|---|---|---|
Speaker | Dae-Hyun Nam | Affiliation | Daegu Gyeongbuk Institute of Science & Technology (DGIST) |
Title | Metal-Organic Hybrid Materials for Electrochemical CO2 Reduction |
Date & Time |
2021-07-08 11:45 ~ 12:00 |
Place | 207 |
---|---|---|---|
Speaker | Debananda Mohapatra | Affiliation | Yeungnam University |
Title | Novel In-situ Heteroatoms Engineered Carbon Nanostructures and MXenes for Clean Energy Applications |
Date & Time |
2021-07-08 13:30 ~ 13:45 |
Place | 207 |
---|---|---|---|
Speaker | Minkyung Kim | Affiliation | Ulsan National Institute of Science and Technology |
Title | Covalent 0D–2D Heterostructuring of Co9S8–MoS2 for Enhanced Hydrogen Evolution in All pH Electrolytes |
Date & Time |
2021-07-08 13:45 ~ 14:00 |
Place | 207 |
---|---|---|---|
Speaker | Hyo Eun Kim | Affiliation | UNIST |
Title | Strategies to produce ammonia in photoelectrochemical system |
Date & Time |
2021-07-08 14:30 ~ 14:45 |
Place | 207 |
---|---|---|---|
Speaker | Hasmat Khan | Affiliation | Pusan National University |
Title | Nanostructured Metal Oxide Semiconductors for Enhanced Photoelectrochemical Properties |
Date & Time |
2021-07-08 14:45 ~ 15:00 |
Place | 207 |
---|---|---|---|
Speaker | Susanta Bera | Affiliation | Pusan National University |
Title | Impact of Atomic-Layer-Deposited SnO2 for Solar Fuel Production |
Next generation diagnostics /therapeutics using nanotechnolgy
Nanobiotechnology is the application of nanotechnology for advancement in the biotechnology fields. In this session, we will introduce not only the latest nanobiomaterials, in vitro diagnostic technology, organ on a chip, organoid, etc., but also various industrially successful nanobiotechnology.
- Nanobiomaterials
- DNA nanotechnology and its front end
- Biomimetics and future nanomachine
- Nanobiospectroscopy and Nanobioimaging
- Nanobiosensors and biochips for diagnostics and detection
- General topics in nanobiotechnology
- Tissue engineering
Date & Time |
2021-07-08 10:30 ~ 11:00 |
---|---|
Place | 212 |
Speaker | Nam-Joon Cho |
Affiliation | NTU, SINGAPORE |
Title | Lipid Coating Technology: A Potential Solution to Address the Problem of Sticky Containers and Vanishing Drugs |
Lecture Summary
Pharmaceutical drugs and vaccines require the use of material containers for protection, storage, and transportation. Glass and plastic materials are widely used for packaging and a longstanding challenge in the field is the nonspecific adsorption of pharmaceutical drugs to container walls – the so-called “sticky containers, vanishing drugs” problem – that effectively reduces the active drug concentration and can cause drug denaturation. This challenge has been frequently discussed in the case of the anticancer drug, paclitaxel, and the ongoing coronavirus disease 2019 (COVID-19) pandemic has brought renewed attention to this material science challenge in light of the need to scale up COVID-19 vaccine production and to secure sufficient quantities of packaging containers. To reduce nonspecific adsorption on inner container walls, various strategies based on siliconization and thin polymer films have been explored, while it would be advantageous to develop mass-manufacturable, natural material solutions, especially ones involving pharmaceutical grade excipients. Inspired by how liposomal nanoparticles have revolutionized the vaccine field, in this Perspective, we discuss the prospects for developing lipid bilayer coatings to prevent nonspecific adsorption of pharmaceutical drugs and vaccines and how recent advances in lipid bilayer coating fabrication technologies are poised to accelerate progress in the field. We critically discuss recent examples of how lipid bilayer coatings can prevent nonspecific sticking of proteins and vaccines to relevant material surfaces and examine future translational prospects.
Date & Time |
2021-07-08 11:00 ~ 11:30 |
---|---|
Place | Online |
Speaker | Masahiro Takinoue |
Affiliation | Tokyo Tech, JAPAN |
Title | DNA droplet technology for novel soft micromachines and molecular robots |
Lecture Summary
Development of DNA-based molecular machines and robots has attracted much attention due to their promising applications in medical, agricultural, and environmental technologies. DNA nanodevices and nanomachines have been constructed based on DNA sequence design, which enables us to program functions and to control the devices and machines according to the program. It is expected to construct cell-like multifunctional and intelligent molecular robots by extending the DNA nanotechnology. In this presentation, we will introduce our recent progress on DNA droplet technology. Cell-sized functional microdroplets have been constructed with DNA nanostructures, and their dynamical functions and behaviors have been controlled in a programmable manner. Here, we will report two types of DNA-based droplets technology: (i) DNA origami-based emulsion and (ii) DNA liquid droplet.
First, we will report a DNA origami nanoplate-based emulsion with designed nanopore function [1]. We constructed DNA-nanoplate-stabilized emulsion because DNA nanoplate produced by DNA origami method will have the design programmability. Here, we generated hexagonal DNA nanoplate using DNA origami technology. The DNA nanoplates were amphiphilized by the modification of the only one face of the hydrophilic DNA nanoplate with hydrophobic cholesterol groups. An aqueous solution of the amphiphilic DNA nanoplate was put into an oil phase of mineral oil, and then the two-phase solution was emulsified. By the microscopic observation, microemulsion stabilized with the amphiphilic DNA nanoplates was confirmed. Finally, we confirmed the ion transportation between contacted two droplets stabilized with the amphiphilic DNA nanoplates with a nanopore using a microdevice for ion current measurement. This result suggests that the integration of programmed function on DNA origami nanoplate-based emulsion.
Second, we will report a DNA droplet produced through liquid-liquid phase separation of a DNA nanostructure (named DNA Y-motif) solution [2]. In this study, we found that the phase behavior of DNA Y-motif could be controlled based on the sequence design of the terminal sticky end of the branches of DNA Y-motif. Also, we found that the fusion of the liquid-like DNA droplets could be controlled based on the sticky-end sequence and that the autonomous fission of DNA droplet could be achieved with enzymatic reaction. Finally, we demonstrated protein positioning in the DNA droplets based on the sequence. These results show that the condensed soft matter phase of DNA nanostructure can be used as a molecular robot body that has the integration ability of functional molecules such as proteins.
We believe that these technologies will promote the construction of molecular robots with integrated functions. Also, in the future, by the combination with biomembrane technology such as a DNA cytoskeleton [3] and the integration with electrical control device such as a computer-controlled artificial cell reactor [4], the functional molecular robots will be helpful in many fields mentioned above.
[1] Ishikawa, D., et al., Angew. Chem. Int. Ed., 58, 15299-15303 (2019).
[2] Sato, Y., et al., Science Advances, Vol. 6, no. 23, eaba3471, (2020).
[3] Kurokawa, C., et al., Proc. Natl. Acad. Sci. USA, 114(28), 7228-7233 (2017).
[4] Sugiura, H., et al., Nature Commun., 7, 10212 (2016).
Date & Time |
2021-07-08 13:30 ~ 14:00 |
---|---|
Place | 212 |
Speaker | Won Jong Kim |
Affiliation | POSTECH, KOREA |
Title | Smart Nanomaterials for Drug and Nitric Oxide Delivery |
Lecture Summary
In this study, we designed polymeric gene carrier consisting of polymer and drug, and applied it to anti-cancer therapy. We prepared hypoxia-responsive mesoporous silica nanocarrier for an enhanced immunocancer therapy assisted by photodynamic therapy. Nanocarrier was designed as a hypoxia-responsive transforming carrier to improve the intracellular uptake of nanocarriers and the delivery of adjuvants to DCs.
As a cell therapy strategy, we used tumor-homing ability of natural killer (NK) cells for the delivery of drug-loaded polymeric micelle. NK cells are decorated with the immunologican synapse environment-responsive micellar system to ensure the release of payload when they attack cancer cells. Harnessing the intrinsic mechanism for the recognition of abnormal cells and the tumor-homing effect of NK cells limit the adverse systemic effects of chemotherapeutic drugs. The overall design concept, physicochemical properties of polymeric micelles, in vitro behaviour and in vivo tumor-targeting ability will be presented in this presentation.
In this study, we also developed novel nitric oxide (NO) delivery system using catecholamine and diazeniumdiolates. Simple two-step reactions comprising catecholamine and diazeniumdiolates enable virtually any material surfaces to release NO with appreciable storage. The modified surfaces showed the antibacterial activity without cytotoxicity. We also prepared NO-scavenging hydrogel for alleviating inflammatory disease such as rheumatoid arthritis (RA). We developed a NO-responsive macro-sized hydrogel by incorporating an NO-cleavable crosslinker (NOCCL); we further evaluated the effectiveness of the NO-scavenging nano-sized hydrogel for treating RA. The NO-Scv gel reduced inflammation levels by scavenging NO in vitro and significantly suppressed the onset of RA as observed in vivo in a mouse RA model.
Date & Time |
2021-07-08 14:00 ~ 14:30 |
---|---|
Place | 212 |
Speaker | Jung-Hwan Park |
Affiliation | Gachon University, KOREA |
Title | Development of Microneedle Array Patch and Its Medical Applications |
Lecture Summary
A microneedle array patch (MAP) has been studied as a means for delivering drugs or vaccines and has shown superior delivery efficiency compared to the conventional transdermal drug delivery system. Recent advancements in the development of MAPs, is reviewed with a focus on their size, shapes, and materials in preclinical and clinical studies for pharmaceutics and vaccines.
We classified MAPs for drug delivery into four types: coated, dissolving, separable, and swellable. We covered their recent developments in material, fabrication process and geometries in preclinical and clinical studies. We tried to determine how these factors could affect the strategies and efficacy of drug delivery.
As examples of QuadMedicine vaccine MAPs (microneedle array patch), Hepatitis B (HepB)Vaccine MAP, influenza (Flu) virus vaccine MAP and canine influenza virus vaccine MAP were introduced. Vaccine MAPs are effective as intramuscular administration (IM) administration of conventional vaccines. HepB vaccine MAP and Flu vaccine MAP showed comparable efficacy with those by IM administration and they showed improved thermal stability and storage stability than liquid formulation of conventional vaccines. Canine Flu vaccine MAP could induce comparable immune response with that by IM administration. The manufacturing process of QuadMedicine could achieve the dose uniformity and low cost of MAP. QuadMedicine vaccine MAP can provide the innovative platform to eradicate the infectious disease, which threatens public health.
The MAP is an excellent drug delivery system that has provided desirable pharmacokinetics and pharmacodynamics in many studies. Also MAP provides solutions to overcome the previous vaccine formulation and administration method. The design of MAPs needs to be determined based on what properties would be effective for the target diseases and purposes. In addition, in preclinical studies, it is necessary to consider not only the novelty of the formulations, but also the feasibility of clinical application. With these considerations, the microneedle array patch will be a better option for drug delivery.
Date & Time |
2021-07-08 15:00 ~ 15:30 |
---|---|
Place | 212 |
Speaker | Taejong Paik |
Affiliation | Chung-Ang University, KOREA |
Title | Colloidal Synthesis and Applications of Lanthanide-based Upconverting Nanocrystals |
Lecture Summary
The lanthanide-based nanocrystals (NCs) have tremendous potential for designing multimodal imaging probes. The f-block lanthanide elements exhibit unique optical and magnetic properties, including upconversion luminescence and paramagnetic behaviors, which can be further manipulated by control of size, shape, and compositions. First, I will describe novel materials chemistry to synthesize luminescence upconverting metal halide NCs. The synthesis of metal halide NCs is performed via injection-free, heating-up method in the presence of a solvent mixture with a high boiling point. We present synthetic method to systematically tailor structure and composition of phase-pure metal halide NCs and investigate upconverting photoluminescence properties by lanthanide doping. In addition, we represent synthesis of pH-responsive upconverting luminescence via dye-modification. We study the near-IR to visible two-photon upconversion of NCs doped with lanthanide elements. The surface modification of upconverting NCs with pH-sensitive organic probes to tailor their luminescence properties depending on the pH of solution.
Date & Time |
2021-07-08 15:30 ~ 16:00 |
---|---|
Place | Online |
Speaker | Wolfgang Parak |
Affiliation | University of Hamburg, Germany |
Title | Inorganic colloidal nanoparticles - from synthesis and characterization towards applications in biology |
Lecture Summary
Several topics of inorganic nanoparticles intended for applications in biology will be discussed. First, the general issue on how reliable nanoparticle properties can be related to their biological impact will be discussed. References: S. Ashraf, A. H. Said, R. Hartmann, M.-A. Assmann, N. Feliu, P. Lenz, W. J. Parak, "Quantitative Particle Uptake by Cells as Analyzed by Different Methods", Angewandte Chemie 59, 5438-5453 (2020); H. Yan, M. Cacioppo, S. Megahed, F. Arcudi, L. Dordevic, D. Zhu, M. Prato, W. J. Parak, N. Feliu, "Influence of the chirality of carbon nanodots on their interaction with proteins and cells", submitted to Nature Communications, in revision. Second, one application of plasmonic nanoparticles in the direction of photothermal heating will be discussed. This will involve in particular the excitation of intracellular calcium waves. Reference: D. Zhu, L. Feng, N. Feliu, A. H. Guse, W. J. Parak, "Stimulation of local cytosolic calcium release by photothermal heating for studying intra- and inter-cellular calcium waves", Advanced Materials, in press.
Date & Time |
2021-07-07 11:00 ~ 11:15 |
Place | 212 |
---|---|---|---|
Speaker | Sachin Ganpat Chavan | Affiliation | Chung-Ang University |
Title | An Electrochemical Biosensor for Serotonin Detection Based on Dual-Molecule Strategy Recognition |
Date & Time |
2021-07-07 11:15 ~ 11:30 |
Place | 212 |
---|---|---|---|
Speaker | Riddhi Nitin Nagda | Affiliation | Yonsei University |
Title | Noncanonical Head-to-Head Hairpin DNA Dimerization at Interfacial Binding Sites by Orange Emissive Silver Nanoclusters |
Date & Time |
2021-07-07 11:30 ~ 11:45 |
Place | 212 |
---|---|---|---|
Speaker | Wooseok Lee | Affiliation | Seoul National University |
Title | High-Throughput Drug Screening Platform Based on Gene Expression |
Date & Time |
2021-07-07 11:45 ~ 12:00 |
Place | 212 |
---|---|---|---|
Speaker | Hogi Kim | Affiliation | KAIST |
Title | Robust Anti-biofouling surfaces with nanoscale gradient polyampholytes fabricated via initiated chemical vapor deposition |
Date & Time |
2021-07-07 13:45 ~ 14:00 |
Place | 212 |
---|---|---|---|
Speaker | Javier Plou | Affiliation | CIC Biomagune |
Title | Monitoring metabolites in the tumor environment by SERS Substrates coated with thermolabile polymer layers. |
Date & Time |
2021-07-07 14:00 ~ 14:15 |
Place | 212 |
---|---|---|---|
Speaker | Pratik Shah | Affiliation | Yonsei University |
Title | Structural insights into the arrangement of fluorescent Silver Nanoclusters within DNA template and its application in disease diagnostics |
Date & Time |
2021-07-07 14:15 ~ 14:30 |
Place | 212 |
---|---|---|---|
Speaker | Huynh Vu Nguyen | Affiliation | Chung-Ang University |
Title | Quantitative determination of Thyroid hormones by electrochemical based biosensor using PCB gold electrode |
Nanomedicine and Immunotherapy
Recently, immunotherapy becomes main stream in the tretament of cancer patients. To enhance the effect of immunotherapy, nanotechnology has potential role in several fields of immunotherapy including immunogenic therapy, tumor microenvironment, and vaccination. In this session, several outstanding researcheres will share their experience in the field of nanomedicine and immunotherapy.
-Immunogenic cell therapy using nanotechnology
-Therapeutic nanomaterials for Tumor microenvironment Immune modulation
-Photonic or Ultrasonic nanomedicine and immunotherapy
-Nanovaccines and immunotherapy
-General topics in nanomedicine
Date & Time |
2021-07-08 13:00 ~ 13:30 |
---|---|
Place | Online |
Speaker | Liangfang Zhang |
Affiliation | UC San Diego, USA |
Title | Biomimetic Nanoparticles for the Treatment of Infectious Diseases |
Lecture Summary
The global incidence of infections caused by bacteria and viruses has been increasing, which imposes a major threat to public health given the high
morbidity and mortality rates associated with these diseases. Nanoparticle technology has enabled a wide array of improvements in the treatment ofinfectious diseases, ranging from improved efficacy in drug delivery to enhanced immunogenicity of vaccines. Among the different bio-inspired
nanotechnology strategies, utilization of cellular membrane material for nanoparticle preparation presents a unique top-down approach that offers the
advantage of being able to completely replicate the surface antigens and functions of source cells. Herein, I report the biological functionalization of
synthetic nanoparticles with cell membranes derived from natural cells. Specifically, I will focus on the use of these cell-mimicking nanoparticles for
the treatment of bacterial and viral infections including SARS-CoV-2 infection.
Date & Time |
2021-07-08 13:30 ~ 14:00 |
---|---|
Place | Online |
Speaker | James Moon |
Affiliation | Univ. of Michigan, USA |
Title | Engineered Biomaterials for Combination Cancer Immunotherapy |
Lecture Summary
With profound advances in immune-oncology, cancer immunotherapy is now considered the fourth pillar of cancer therapy, joining the ranks of surgery, radiotherapy, and chemotherapy. However, only a small subset of cancer patients responds to cancer immunotherapy. While the combination of multiple immune checkpoint blockers generally improves the clinical responses, this can lead to severe immune-related adverse events that result in clinical manifestations of dermatitis, colitis and hepatitis. Thus, to fully realize the potential of cancer immunotherapy, new approaches are needed to amplify anti-tumour T-cell immune responses, to convert cold tumours into hot tumours, and to sensitize tumours to immunotherapies with minimal off-target toxicity and immune-related adverse events. Here, we present new biomaterial-based strategies for amplifying anti-tumor immune responses and sensitizing tumors to immunotherapies in a safe and effective manner. Briefly, we show that lipid-based nanodiscs can efficiently co-deliver antigen and immunostimulatory molecules to draining lymph nodes and elicit potent CD8+ cytotoxic T lymphocyte responses directed against tumor antigens, leading to substantially enhanced anti-tumor efficacy in multiple murine tumor models, including colon carcinoma, melanoma, and glioblastoma multiforme. We have also demonstrated their efficacy in non-human primates. In a second research thrust, we are developing new biomaterials for in situ modulation of the gut microbiome for regulation of local and systemic immune responses. We will share our latest results showing the therapeutic potential of our gut modulation approach in the context of improving the safety and efficacy of immune checkpoint blockers. Owning to the facile manufacturing process, robust therapeutic efficacy, and good safety profiles, our biomaterial-based approaches may offer powerful and convenient platforms for improving cancer immunotherapy and cancer patient outcomes.
Date & Time |
2021-07-08 14:00 ~ 14:30 |
---|---|
Place | 210 |
Speaker | Yu-Kyoung Oh |
Affiliation | Seoul National Univerysity, KOREA |
Title | Nanomaterials for modulation of tumor immune microenvironments |
Lecture Summary
Nanostructures such as nanosheets, and nanoballs have been studied for delivery of chemical anticancer drugs and oligonucleotides. Although numerous studies have been done, the translation to commercialized products has not been successful. We aimed to design nanosystems which can modulate the immune microenvironment of tumors. For immunotherapy, adjuvant-loaded nanoparticles were modified with immune checkpoint blockade. In tumor-bearing xenograft, the surface-modified nanostructures provided selective activation by cleavage of fibroblast-associated protein at tumor microenvironment, and greater antitumor effect than other comparison groups. Moreover, we designed an adjuvant-entrapped nanoparticle which can assemble with tumor antigens in situ for effective activation of immune cells. The systemic administration of adjuvant-entrapped nanoparticles with near infrared light irradiation increased the activity of immune cell infiltration to the tumor cells, and inhibited tumor growth. In another study, we used nanomaterials for modulating the metabolic features of T cells in the tumor microenvironments. T cell-specific delivery and modulation of lipid metabolism enhanced the capability of T cells to recognize and attack tumor cells. Taken together, these studies suggest the potential of nanomaterials for modulating the immune microenvironments of tumors.
Date & Time |
2021-07-09 13:00 ~ 13:30 |
---|---|
Place | 210 |
Speaker | Jae Hyung Park |
Affiliation | Sungkyunkwan University, KOREA |
Title | Polymeric Nanomedicines for ROS-Mediated Cancer Immunotherapy |
Lecture Summary
Recently, reactive oxygen species (ROS) have been highlighted as one of the key players that underlie the acquisition of the various hallmarks of cancer. As ROS are associated with all stages of cancer, their applications in cancer treatment based on the following concentration‐dependent implications have attracted much attention: (1) low to moderate levels of ROS as key signaling molecules, (2) elevated levels of ROS in cancer cells as one of the unique characteristics of cancer, and (3) excessive levels of ROS as cytotoxic agents.In our group, considering ROS from a different point of view, various cancer nanomedicines have been designed to achieve spatiotemporal control of therapeutic action, the main research focus in this area. The integration of nanomedicine and ROS‐mediated therapy has emerged as the new paradigm in the treatment of cancer, based on promising proof‐of‐concept demonstrations in preclinical studies. Further efforts to ensure clinical translation along with more sophisticated cancer nanomedicines to address relevant challenges are expected to be made in the coming years.
Date & Time |
2021-07-09 13:30 ~ 14:00 |
---|---|
Place | 210 |
Speaker | Ji Ho Park |
Affiliation | KAIST, KOREA |
Title | Nanomedicine for the Treatment of Atherosclerosis |
Lecture Summary
Atherosclerosis is a chronic inflammatory disease that progresses with the accumulation of interrelated cholesterol crystals (CC) and macrophages in the arterial wall. These are not only the main components of atherosclerotic plaques, but also key inflammation-triggering sources that promote their own accumulation. However, existing therapeutics have not achieved effective removal of both CC and macrophages from plaques for the treatment of atherosclerosis. In this talk, I will introduce a new class of nanomedicine that delivers the anti-inflammatory drug to plaques and carries away cholesterol from there at the same time for effective anti-atherosclerosis therapy. In mouse models of atherosclerosis, systemically injected nanomedicine accumulates preferentially in atherosclerotic plaques and significantly reduces the amount of cholesterol crystals and the number of macrophages, thus leading to inhibition of atherosclerotic plaque development and regression of the established plaques. I believe that this nanomedicine offers a powerful therapeutic option for the treatment of atherosclerosis.
Date & Time |
2021-07-09 14:00 ~ 14:30 |
---|---|
Place | 210 |
Speaker | Yong Taik Lim |
Affiliation | Sungkyunkwan University, KOREA |
Title | Nanoengineered synthetic immune niches for the modulation of tumor immunosuppressive microenvironments in cancer immunotherapy |
Lecture Summary
Cancer immunotherapies that harness the body's immune system to combat tumors have received extensive attention and become mainstream strategies for treating cancer. Despite promising results, some problems remain, such as the limited patient response rate and the emergence of severe immune‐related adverse effects. For most patients, the therapeutic efficacy of cancer immunotherapy is mainly limited by the immunosuppressive tumor microenvironment (TME). To overcome such obstacles in the TME, the immunomodulation of immunosuppressive factors and therapeutic immune cells (e.g., T cells and antigen‐presenting cells) should be carefully designed and evaluated. Nanoengineered synthetic immune niches have emerged as highly customizable platforms with a potent capability for reprogramming the immunosuppressive TME.
In this study, nano‐biomaterials that could modulate the immunosuppressive TME in a spatiotemporal manner for enhanced cancer immunotherapy were rationally designed and systematically investigated [1-6]. Local and extended release of immunomodulatory drugs from nanoengineered synthetic immune niches such as immuneCare-DISC and iGel depleted immunosuppressive cells, while inducing immunogenic cell death and increased immunogenicity. When nanoengineered synthetic immune niches were applied as a local postsurgical treatment, both systemic antitumor immunity and a memory T cell response were generated, and the recurrence and metastasis of tumors to lungs and other organs were significantly inhibited. Reshaping of the TME using synthetic immune niches also reverted non-responding groups to checkpoint blockade therapies into responding groups. The nanoengineered synthetic immune niches are expected as an immunotherapeutic platform that can reshape immunosuppressive TMEs and synergize cancer immunotherapy with checkpoint therapies, with minimized systemic toxicity.
Date & Time |
2021-07-08 14:45 ~ 15:00 |
Place | 210 |
---|---|---|---|
Speaker | Hyeong Seop Keum | Affiliation | KAIST |
Title | Bilirubin nanomedicine alleviates psoriatic skin inflammation by reducing oxidative stress and suppressing pathogenic signaling |
Date & Time |
2021-07-08 15:00 ~ 15:15 |
Place | 210 |
---|---|---|---|
Speaker | Da-Sol Kim | Affiliation | Jeonbuk National University Hospital |
Title | Comparison of the ultrasonographic imaging using H2O2 responsive nanoparticle and gas-filled contrast in rat models with various muscle injuries |
Date & Time |
2021-07-08 15:15 ~ 15:30 |
Place | 210 |
---|---|---|---|
Speaker | Hojeong Shin | Affiliation | Seoul National University |
Title | Identification of an antiviral therapeutic using a graphene oxide biosensor for viral genome detection |
Date & Time |
2021-07-08 15:30 ~ 15:45 |
Place | 210 |
---|---|---|---|
Speaker | Mi Yeon Jeon | Affiliation | Seoul National University |
Title | TSPO targeted photodynamic therapy with IR780 conjugated TSPO-binding ligand loaded pH-sensitive liposome |
Date & Time |
2021-07-08 15:45 ~ 16:00 |
Place | 210 |
---|---|---|---|
Speaker | Seungki Baek | Affiliation | Seoul national university |
Title | Enhanced Immunotherapy with PEGylated Macrophage Derived Nanovesicles |
Date & Time |
2021-07-09 14:45 ~ 15:00 |
Place | 210 |
---|---|---|---|
Speaker | Minseok Suh | Affiliation | Seoul National University Hospital |
Title | Development of Micelle-encapsulated ESIONs as a T1 Contrast Imaging Agent : Prolonged Blood Circulation and Enhanced Hepatobiliary Excretion |
Date & Time |
2021-07-09 15:00 ~ 15:15 |
Place | 210 |
---|---|---|---|
Speaker | Ji Yong Park | Affiliation | Seoul National University |
Title | Fate controlling of finely tuned albumin nano-platform using glycosylation for medical uses |
Date & Time |
2021-07-09 15:15 ~ 15:30 |
Place | 210 |
---|---|---|---|
Speaker | Joon Woo Song | Affiliation | Korea University Guro Hospital |
Title | Targeted Activation of Peroxisome Proliferator-activated Receptor γ (PPARγ) Rapidly Suppresses Inflammation through Inhibition of Toll-like Receptor 4/nuclear Factor-κB (TLR4/NF-κB) Pathway and Further Shifts Advanced Atheroma into a Stable Phenotype |
Date & Time |
2021-07-09 15:30 ~ 15:45 |
Place | 210 |
---|---|---|---|
Speaker | Jin Hyuk Kim | Affiliation | Korea University Guro Hospital |
Title | In vitro Photodynamic Effects of the Dectin-1 receptor targeted-photoactivatable Nanoparticles on Atherogenic cells |
Date & Time |
2021-07-09 15:45 ~ 16:00 |
Place | 210 |
---|---|---|---|
Speaker | Kyung Su Kim | Affiliation | Korea university |
Title | Evaluation of ICG guided metastatic lymph node identification. |
Date & Time |
2021-07-09 16:00 ~ 16:15 |
Place | 210 |
---|---|---|---|
Speaker | Hoomin Lee | Affiliation | Inha University |
Title | Hypoxia-responsive nanomedicine for overcoming tumor microenvironment-induced resistance to cancer therapy |
Date & Time |
2021-07-09 16:15 ~ 16:30 |
Place | 210 |
---|---|---|---|
Speaker | Jihoon Han | Affiliation | Pusan National University |
Title | TiO2 nanoparticles for pH-responsive drug delivery system (DDS) and photodynamic therapy (PDT) with poly(acrylic acid)-calcium phosphate (PAA-CaP) shell |
Date & Time |
2021-07-09 16:30 ~ 16:45 |
Place | 210 |
---|---|---|---|
Speaker | Chiwoo Oh | Affiliation | Seoul National University |
Title | Nanocarrier with H2S is novel immune modulator in dextran sulfate sodium induced colitis model |
Date & Time |
2021-07-09 16:45 ~ 17:00 |
Place | 210 |
---|---|---|---|
Speaker | Daehyun Kim | Affiliation | Seoul National University |
Title | PD-L1 Targeting Immune-Microbubble Complex Enhances Therapeutic Index in Murine Colon Cancer Models |
Nanoelectronics for extending computing
In spite of tremendous technical innovations in the conventional silicon semiconductor industry, further physical channel length scaling nearly reaches the fundamental quantum limit. To overcome the main limitations of the conventional silicon devices, new computing methodologies, such as neuromorphic computing and quantum computing, are developed. In the sessions of this theme, various advances in nano materials, structures and devices for electronic applications will be discussed with a focus on their intrinsic properties, operating principles, and implications to advanced silicon technologies and new computing methodologies. The presentations of the state-of-the-art technologies in nanoelectronics will provide an overview and vision for extending computing with innovative technologies.
- Novel materials and devices for advanced logic and memory technologies
- Neuromorphic devices including synapse- and neuron-mimic devices
- Quantum information technology
- Spintronic and valleytronic devices
- Electronic devices based on low-dimensional materials
- Sensors and actuators based on nano-materials and nano-structures
- Organic nano-devices
Date & Time |
2021-07-07 09:00 ~ 09:30 |
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Place | Online |
Speaker | Zheng Liu |
Affiliation | Nanyang Technological Univ., SINGAPORE |
Title | 2D materials for sustainable word: from synthesis to AI |
Lecture Summary
Using green energy or increase energy efficiency is the key to a sustainable world. I will introduce the potentials of 2D materials to build a sustainable world in terms of low-cost H2 generation, low-power-consuming devices, and IA enabled optimization of novel materials. Semiconducting catalysts are great candidates to replace noble metal to make green energy such as H2 due to their low cost. Using 2D materials as the model system, we have revisited the semiconductor-electrolyte interface and unraveled a universal self-gating phenomenon through micro-cell based measurements [1]. We unveiled a surface conductance mechanism that dominates the charge transport in semiconductor electrocatalysts. Based on this, we provided a guideline on how to design high-performance semiconductor electrocatalyst. Apart from the generation of green energy, we are also using 2D materials to build next-generation CMOS architecture, such as negative capacitance field-effect transistors, which may dramatically reduce the consumption of energy [2]. Finally, I will discuss our recent progress on the machine learning guided materials synthesis, as well as the novel design of neural networks hardware based on 2D materials [3].
[1] Yongmin He, et al., Self-gating in semiconductor electrocatalysis, Nature Materials, 2019.
[2] Xiaowei Wang, et al., Van der Waals negative capacitance transistors, Nature Communications 10, 3037, 2019
[3] Bijun Tang, et al., Machine learning-guided synthesis of advanced inorganic materials, Materials Today 2020. DOI: 10.1016/ j.mattod.2020.06.010
Date & Time |
2021-07-07 13:30 ~ 14:00 |
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Place | 306 |
Speaker | Soon-Gil Yoon |
Affiliation | Chungnam Nat'l Univ., KOREA |
Title | High Transparency, Flexibility, Stretchability of Transfer-Free Graphene Electrodes |
Lecture Summary
Herein, we demonstrate theoretical and experimental evidence for 4-inch-scale, high-quality graphene grown directly on 10 nm-thick-Ti-buffered substrates via plasma-assisted thermal chemical vapor deposition (PATCVD) at temperatures below 150 °C. The transfer-free monolayer graphene revealed predominant flexible and stretchable properties with a sheet resistance as low as 80 5.0 □- 1 and a giant average domain size of ~ 380 m. The in-situ 4-layers stacked graphene showed an ultralow resistance of ~ 6 □-1 by a self-p-doping under ambient conditions. Graphene-field effect transistors (FETs) fabricated on polydimethylsiloxane (PDMS) substrates revealed an extraordinary hole mobility of ~ 21,000 cm2V-1s-1 at a gate voltage of - 4V regardless of the channel lengths. They retained ~ 87% of their original mobility at 140% strain parallel to the direction of charge transport and showed a superb mechanical robustness when stretched repeatedly for 5,000 cycles under 120% parallel strain. Monolayer graphene grown on PDMS, which did not undergo plastic deformation, exhibited unprecedented flexibility at a static tensile strain of 15% (radius of curvature: 0.6 mm) and for 3104 bending cycles under a tensile strain of 11% (radius of curvature: 0.9 mm). Large-area, high-quality monolayer graphene synthesized directly at low temperatures could enable the practical development of transparent, flexible, and stretchable electronics.
Date & Time |
2021-07-08 10:00 ~ 10:30 |
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Place | 306 |
Speaker | Seyoung Kim |
Affiliation | POSTECH, KOREA |
Title | Efficient AI Computation using Neuromorphic Devices and Materials |
Lecture Summary
Artificial Intelligence (AI) technology based on artificial neural networks is making a huge business and socioeconomic impact, changing our daily life. With an expectation of achieving a brain-like efficiency and large performance gain, there has been increasing interest to implement artificial neural networks using novel non-volatile memory devices. Novel cross-point array architectures based on resistive memory devices, which can be operated in a massively parallel manner, have shown potential to achieve a large acceleration in AI computation. For realization of such architectures in hardware, the specifications for synaptic devices are revealed to be different in many aspects with those for traditional memory devices, necessitating new material systems and device designs [1] for efficient AI computation. In this talk, I will overview the recent progress and effort to achieve ideal synaptic device characteristics for novel neuromorphic architectures, as exemplified in our recent experimental results on resistive memory devices (RRAM), capacitor-based approach, and 3-terminal ionic switching devices.
Date & Time |
2021-07-08 13:30 ~ 14:00 |
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Place | Online |
Speaker | Hyun Soo Yang |
Affiliation | Nat’l Univ. of Singapore, SINGAPORE |
Title | Topological Spintronics |
Lecture Summary
Layered topological materials such as topological insulators (TIs) and Weyl semimetals are a new class of quantum matters with large spin-orbit coupling. We reveal spin textures of such materials using the bilinear magneto-electric resistance (BMR) and photocurrent mapping. Topological surface states (TSS) dominated spin orbit torques are identified, and magnetization switching at room temperature is demonstrated in a topological material/ferromagnet (FM). Magnon-torque-driven magnetization switching is also demonstrated in the TI/NiO/FM devices at room temperature. In addition, topological materials can provide an alternative for rectification or frequency doubling. Looking towards the future, we hope that these studies will spark more works on harnessing spin currents at topological material/magnet interfaces and energy harvesting applications from topological materials.
Date & Time |
2021-07-08 15:00 ~ 15:30 |
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Place | 306 |
Speaker | Gahyun Choi |
Affiliation | KRISS, KOREA |
Title | Quantum computing system based on superconducting circuit |
Lecture Summary
Quantum computer enables to solve complex problems faster than classical computer using quantum phenomena such as superposition and entanglement. Superconducting circuit is one of the leading platforms for realizing the quantum computer. The superconducting quantum computing systems including qubit can make circuit design with various parameters and are proper to expand to large-scale quantum system. In this talk, I introduce the superconducting quantum computing system in KRISS and present the latest progress on superconducting multi-qubit system. We characterized the qubit in the scalable quantum system and estimated the error rate of quantum gates. Also, we reconstructed various quantum states using single and two qubit gates.
Date & Time |
2021-07-09 10:00 ~ 10:30 |
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Place | Online |
Speaker | Ya-Ping Hsieh |
Affiliation | Academia Sinica, Taiwan |
Title | The promise of atomically thin intercalants to 2D electronics |
Lecture Summary
Intercalation is a century-old process of molecule insertion into layered materials. The advent of single-layered 2D materials has provided new opportunities to understand and apply intercalation processes. In this talk, I will give an overview of the potential of atomically thin intercalants towards future nanoelectronics.
First, I will demonstrate the ordering of intercalants in the graphene van-der-Waals gap and its enabling characteristics for producing novel 2D materials. Through a planarized solid-state chemical reaction of intercalants and a crystal surface, transition-metal monochalcogenides of different compositions could be produced with atomic thickness precision. Thus-produced 2D crystals exhibit commonly unattainable thermodynamic
phases with ultra-large phase transition depression and interesting electronic properties. The presented ability to produce large-scale 2D crystals with high environmental stability was applied to highly sensitive and fast optoelectronic sensors. This intercalation-based approach extends the morphological, compositional, and thermodynamic complexity of 2D materials. Second, the interaction of intercalants with 2D materials junctions was shown to produce a novel selective chemical stabilization effects. The preferential interaction of fluorine with a functionalized graphene layer was shown to provide a unique and virtually perfect etch selectivity of graphene layers in a plasma. The atomic thickness and unprecedented etch stability of 2D materials junctions was applied to ultra-high-resolution fabrication of semiconductors through a facile offset pattering approach yielding atomically-precise nanostructures at large scale for future electronics. Finally, I will demonstrate the 2D material-enabled modification of intercalants and their unique applications to electronics. By nanoelectromechanical confinement of intercalated water between two graphene layers, a 2D ice phase could be formed at room temperature that exhibits a strong and permanent dipole. Our observation represents the first direct
observation of ferroelectric properties of water ice in a 2D phase. Characterization of this permanent polarization with respect to varying water partial pressure and temperature reveals the importance of forming a monolayer of 2D ice for ferroelectric ordering which agrees with theoretical modeling . The observed robust ferroelectric properties of 2D ice enable novel nanoelectromechanical devices that exhibit memristive properties. A unique bipolar mechanical switching behavior was observed where previous charging history controls the transition voltage between low-resistance and high-resistance state. This advance enables the realization of rugged, non-volatile, mechanical memory exhibiting switching ratios of 106, 4bit storage capabilities and no degradation after 10,000 switching cycles.
1. S.H. Chen et al. Adv. Funct. Mater. (2020) DOI: 10.1002/adfm.202004370
2. Chin, HT. et al. npj 2D Mater Appl (2021) DOI: 10.1038/s41699-021-00207-2
Date & Time |
2021-07-09 13:30 ~ 14:00 |
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Place | 306 |
Speaker | Jehyung Kim |
Affiliation | UNIST, KOREA |
Title | Defect qubits in a solid-state system |
Lecture Summary
Optically-active defects in crystals can serve on-demand single photons and coherent spin qubits. Therefore, they provide important hardware for solid-state quantum architectures. However, limitation in optical interface and unwanted interaction in solid-state environment prevents efficient control and readout of the qubits states. Here, we present recent progress for high-resolution and high contrast optical interfaces for defect qubits as well as suppressed phonon interaction in point-planar defect complex in nanowire structures. Our approaches enable us to address defects with higher resolution and sensitivity, and therefore it will pave a new way of exploring solid-state quantum systems.
Date & Time |
2021-07-09 16:00 ~ 16:30 |
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Place | Online |
Speaker | Fedor Jelezko |
Affiliation | Ulm University, Germany |
Title | Diamond spin qubits for quantum sensing |
Lecture Summary
A particularly interesting application of diamond based quantum sensing is the detection of nuclear magnetic resonance on nanometer scales, including the detection of individual nuclear spins or small ensembles of external nuclear spins. Single nitrogen vacancy (NV) color centers in diamond currently have sufficient sensitivity for detecting single external nuclear spins and resolve their position within a few angstroms. The ability to bring the sensor close to biomolecules by implantation of single NV centers and attachment of proteins to the surface of diamond enabled the first proof of principle demonstration of proteins labeled by paramagnetic markers and label-free detection of the signal from a single protein. Single-molecule nuclear magnetic resonance (NMR) experiments open the way towards unraveling dynamics and structure of single biomolecules. However, for that purpose, NV magnetometers must reach spectral resolutions comparable to that of conventional solution state NMR. New techniques for this purpose will be discussed. Most of mentioned above results obtained so far with diamond centers are based on optical detection of single NV color centers. We will also show how photoelectrical detection of NV centers base on spin selective photoionization can provide robust and efficient access to spin state of individual color center.
Date & Time |
2021-07-07 09:30 ~ 09:45 |
Place | 306 |
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Speaker | Seok Joon Yun | Affiliation | Sungkyunkwan university |
Title | Room-temperature ferromagnetism in monolayer WSe2 semiconductor via vanadium dopant |
Date & Time |
2021-07-07 09:45 ~ 10:00 |
Place | 306 |
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Speaker | Soo Ho Choi | Affiliation | Sungkyunkwan University |
Title | Epitaxial Single-Crystal Growth of Transition Metal Dichalcogenide Monolayers via Atomic Sawtooth Au Surface |
Date & Time |
2021-07-07 10:00 ~ 10:15 |
Place | 306 |
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Speaker | Wonjun Shin | Affiliation | Seoul National University |
Title | Effects of oxygen flow rate on the NO2 gas sensing and low-frequency noise characteristics in IGZO gas sensors |
Date & Time |
2021-07-07 10:45 ~ 11:00 |
Place | 306 |
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Speaker | Jung Sun Eo | Affiliation | Korea University KUKIST Graduate School of Convergence |
Title | Molecular selector realized by the molecular heterojunction with two-dimensional semiconductors designed by the molecular dipole moment direction |
Date & Time |
2021-07-07 11:00 ~ 11:15 |
Place | 306 |
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Speaker | Joo Hong Lee | Affiliation | Sungkyunkwan university |
Title | Reliable organic-inorganic perovskite memristors based on van der Waals metal contacts |
Date & Time |
2021-07-07 11:15 ~ 11:30 |
Place | 306 |
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Speaker | Ji-Young Hwang | Affiliation | Korea Carbon Industry Promotion Agency |
Title | Flexible, Conductive Carbon Composites for Wireless Electrocardiogram Devices |
Date & Time |
2021-07-07 11:30 ~ 11:45 |
Place | 306 |
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Speaker | Changwoo Han | Affiliation | Sungkyunkwan University |
Title | Conventional/large-scale operation metrics to do comprehensive analysis on 8T-SRAM bit cells |
Date & Time |
2021-07-07 14:00 ~ 14:15 |
Place | 306 |
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Speaker | Geumhyuck Bang | Affiliation | Dong-eui university |
Title | Highly fast and dense oxide layer deposition and its application in transparent heaters |
Date & Time |
2021-07-07 14:15 ~ 14:30 |
Place | 306 |
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Speaker | Vo Thi Bao Tran | Affiliation | Dong-Eui University |
Title | Thermostable transparent heaters composed of ultrathin planar metallic layers |
Date & Time |
2021-07-08 10:30 ~ 10:45 |
Place | 306 |
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Speaker | Dongseok Kwon | Affiliation | Seoul National University |
Title | Analog Memory Device with an Al2O3/Si3N4 Gate Stack for On-Chip Trainable Hardware-Based Neural Networks |
Date & Time |
2021-07-08 10:45 ~ 11:00 |
Place | 306 |
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Speaker | Gwon Kim | Affiliation | Sungkyunkwan University |
Title | Experimental verification on charge-boosting effect in metal-ferroelectric-metal capacitor |
Date & Time |
2021-07-08 11:00 ~ 11:15 |
Place | 306 |
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Speaker | Jong Ho lee | Affiliation | Seoul National University |
Title | Field Effect Transistor-Type Neuron Device with Al2O3/Si3N4 as a Gate Insulator Stack for Low-Power and High-Density Neuromorphic System |
Date & Time |
2021-07-08 11:15 ~ 11:30 |
Place | 306 |
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Speaker | Joon Hwang | Affiliation | Seoul national University |
Title | Mitigating the effect of quantization error in synaptic conductance of off-chip learning neuromorphic systems |
Date & Time |
2021-07-08 11:30 ~ 11:45 |
Place | 306 |
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Speaker | Donghyun Go | Affiliation | POSTECH |
Title | Electrical Variations of Non-Circular Cell Structure in 3D NAND Flash Memory Using TCAD-Machine Learning Framework |
Date & Time |
2021-07-08 14:00 ~ 14:15 |
Place | 306 |
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Speaker | Taehyeong Lee | Affiliation | Dong-Eui University |
Title | Wettability regulation of metallic layers via surface modification of oxide supports |
Date & Time |
2021-07-08 14:15 ~ 14:30 |
Place | 306 |
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Speaker | Kyungho Hong | Affiliation | Seoul National University |
Title | Analysis on self-compliance and gradual reset characteristics of RRAM with oxygen scavenging layer |
Date & Time |
2021-07-08 15:30 ~ 15:45 |
Place | 306 |
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Speaker | Jiyun Choi | Affiliation | Dong-Eui University |
Title | Transparent heaters having extremely fast thermal response and flexibility achieved with ultra-thin planar Cu layers |
Date & Time |
2021-07-08 15:45 ~ 16:00 |
Place | 306 |
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Speaker | Woojin Park | Affiliation | Chungbuk National University |
Title | Demonstration of PVDF-TrFE/Si ferroelectric synapse device |
Date & Time |
2021-07-09 10:30 ~ 10:45 |
Place | 306 |
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Speaker | Byeonghak Park | Affiliation | Sungkyunkwan University |
Title | Beyond Nanoscale Crack based Sensors: Sensitivity, Durability, Visualization and directionality for physiology detection |
Date & Time |
2021-07-09 10:45 ~ 11:00 |
Place | 306 |
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Speaker | Yubin Son | Affiliation | Yonsei University |
Title | Metal Hydroxide Nanoparticle Deposited Porous Carbon as Electrodes for High Performance Supercapacitor |
Date & Time |
2021-07-09 11:00 ~ 11:15 |
Place | 306 |
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Speaker | Geonho Kim | Affiliation | Yonsei University |
Title | High Performance Separator for Li-S Battery Using Langmuir-Blodgett |
Date & Time |
2021-07-09 11:15 ~ 11:30 |
Place | 306 |
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Speaker | Seo Yeah Oh | Affiliation | Yonsei University |
Title | Hierarchical Core-shell MOF derived Porous Carbon as Lithium-Sulfur Battery Cathodes |
Date & Time |
2021-07-09 11:30 ~ 11:45 |
Place | 306 |
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Speaker | Jihyeon Park | Affiliation | Yonsei university |
Title | A Systematic Correlation between Morphology of Porous Carbon Cathode and Electrolyte in Lithium-Sulfur Battery |
Date & Time |
2021-07-09 14:00 ~ 14:15 |
Place | 306 |
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Speaker | Do Hyeon Kim | Affiliation | GIST |
Title | Ultra-thin and high selective emission by combining lossless layer |
Date & Time |
2021-07-09 14:15 ~ 14:30 |
Place | 306 |
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Speaker | Jae Hyeok Ryu | Affiliation | Yonsei University |
Title | Near-infrared/Visible Light Induced Spatio-temporal Electrical Swtich via Independent Multi-states of Photoresponsive Nanocomposite |
Date & Time |
2021-07-09 14:30 ~ 14:45 |
Place | 306 |
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Speaker | Hyunbin Park | Affiliation | Yonsei University |
Title | Reversible Nanoscale Molecular Communication System |
Date & Time |
2021-07-09 14:45 ~ 15:00 |
Place | 306 |
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Speaker | Hojoong Jung | Affiliation | Korea Institute of Science and Technology |
Title | Diamond photonic crystal micro mirror |
Date & Time |
2021-07-09 15:30 ~ 15:45 |
Place | 306 |
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Speaker | Yeonwoo Kim | Affiliation | Seoul National University |
Title | A Solution for Polarization-Leakage Relationship of Pure-HfO2 Based Laminated Metal-Ferroelectric-Insulator-Semiconductor Stack |
Date & Time |
2021-07-09 15:45 ~ 16:00 |
Place | 306 |
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Speaker | Sungjun Kim | Affiliation | Sungkyunkwan University |
Title | Ferroelectric polymer-based artificial synapse for neuromorphic computing |
Date & Time |
2021-07-09 16:30 ~ 16:45 |
Place | 306 |
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Speaker | So-Yeon Kim | Affiliation | Sungkyunkwan University |
Title | Layered Double Perovskite for High ON/OFF Ratio Memristor |
Date & Time |
2021-07-09 16:45 ~ 17:00 |
Place | 306 |
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Speaker | Kyu-Ho Lee | Affiliation | Seoul National University |
Title | Area-efficient hardware design for neural network using TFT-type synaptic devices |
Advances in Nanophotonics from Imaging Science to Energy Applications
Various approaches have been attempted to overcome the limitations of existing optical techniques based on unique properties of light-matter interactions at the nano-scale. In this session, we will examine recent developments in nanophotonic technologies such as metamaterials, near-field optics, photonic crystals, plasmonics, etc using diverse optical nanostructures that have been applied to address conventional technical limitations and also explore potential application areas in optics and optoelectronics where nanophotonics may directly prove useful. Furthermore, this session will be an opportunity in which we can see emerging possibilities in nanobio technology, communication, energy, and medicine in the future.
The topics for the Nanophotonics session include but are not limited to:
- Integration and applications of nanophotonic devices and systems
- Light-matter interaction on a nanoscale
- Metamaterials
- Nanobiophotonics
- Nanofabrication based on photonic technology
- Nanophotonic devices: nanoscale waveguides, detectors, and lasers
- Nanophotonics for energy harvesting, conversion, ad photocatalysis
- Nanoscale silicon photonics
- Nanostructures for optics and photonics
- Near-field microscopy
- Optofluidics
- Photonic crystals
- Plasmonics and optics with nanoscale metallic structures
- Semiconductor quantum dots
- Ultrafast optics in nanomaterials
Date & Time |
2021-07-08 10:00 ~ 10:30 |
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Place | Online |
Speaker | Renmin Ma |
Affiliation | Peking University, CHINA |
Title | Topological Vortex Lasers Based on Spin-momentum-locked Edge Mode |
Lecture Summary
We report an emerging out-of-plane radiation feature of spin-momentum locking in a non-Hermitian topological photonic system and demonstrate a high performance topological vortex laser based on it. We find that the gain saturation effect lifts the degeneracy of the paired counterpropagating spin-momentum-locked edge modes enabling lasing from a single topological edge mode. The near-field spin and orbital angular momentum of the topological edge mode lasing has a one-to-one far-field radiation correspondence.
Date & Time |
2021-07-08 10:30 ~ 11:00 |
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Place | Online |
Speaker | Takashi Asano |
Affiliation | Kyoto University, JAPAN |
Title | Thermal emission control using photonic crystals |
Lecture Summary
Wavelength-selective thermal emitters, which produce only light in a specific wavelength range when heated, can improve the energy utilization
efficiency in various thermal radiation applications such as spectroscopic analysis, illumination, heating, and energy conversion. By appropriately
designing both the optical absorption spectra of the materials of emitters and the optical resonance spectra of the structures of the emitters, we have
realized wavelength-selective thermal emitters operating at various wavelengths ranging from mid-infrared to near-infrared and visible. In this presentation, we introduce narrow-band thermal emitters in the midinfrared region and their fast modulation. We also introduce wavelengthselective thermal emitters in the near-infrared region and their application to thermophotovoltaic power generation systems.
Date & Time |
2021-07-08 13:00 ~ 13:30 |
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Place | 305 |
Speaker | Seunghoon Han |
Affiliation | Samsung Advanced Institute of Technology, KOREA |
Title | Compact Metasurface Structured-Light Projectors for 3D Sensing |
Lecture Summary
The demand for miniaturizing optical devices is growing as it becomes a critical factor to determine the design and performance of mobile and wearable platforms like smartphones and smartwatches. Metasurface technology is excellent for achieving this in that it provides maximal spatial sampling rates for precisely controlling light suppressing higher-order diffractions of conventional diffractive optical elements. We will present Structured-Light (SL) projectors made of dielectric metasurface optical elements and near-infrared laser diodes. The metasurfaces are composed of amorphous Si pillars sitting on a Quartz substrate. The pillars are fabricated by photolithography and nanofabrication processes arranged with sub-wavelength intervals. The metasurface SL projectors provide simple and compact module solutions for optical 3D sensors. Only a single metasurface element constitutes the projector optics. Also, small module volumes (heights lower than 2mm) are possible. Metasurfaces can minimize various optical devices for next-generation mobile and wearable platforms with simple mass fabrication.
Date & Time |
2021-07-08 13:30 ~ 14:00 |
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Place | 305 |
Speaker | Kyujung Kim |
Affiliation | Pusan National University, KOREA |
Title | Super resolution imaging techniques for various biological events using metastructures |
Lecture Summary
This lecture covers trends of metastructure designs to enhance imaging resolution. Especially, enhanced imaging resolution techniques with metastructures are introduced to understand complex biological system. Among the many approaches, dielectric metastructures in contact with the inside of cells have been reported as a one of useful imaging applications since an observation volume can be confined down to few-tens nanometre theoretically. Here, we introduce the technique to fabricate meta nanoarrays that consist of SiO2 nanopillars terminated with gold nanodisks, allowing extreme light localization. The electromagnetic field profiles of the meta-arrays are obtained through simulations and imaging resolution of cell membrane and biomolecules in living cells are tested. Moreover, we discuss the feasibility of metastructures to unveil unknown biological events under environmental extreme.
Date & Time |
2021-07-09 10:00 ~ 10:30 |
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Place | Online |
Speaker | Prabhat Verma |
Affiliation | Osaka University, JAPAN |
Title | Plasmonically enhanced spectroscopies for nano-Raman imaging and sensing |
Lecture Summary
Plasmonically enhanced spectroscopies, such as the surface-enhanced Raman spectroscopy (SERS) and the tip-enhanced Raman spectroscopy (TERS) have been well utilized for both, sensing tiny amounts of specific molecules, and imaging various samples at the nanoscale. The most important phenomenon in such measurements is the selective enhancement of Raman signal from the nanometric volume of a sample, which makes it possible to study a sample at extremely high spatial resolution, or when the sample may have a very low concentration. A large amount of research has been dedicated to improve the enhancement factor in such plasmonic techniques, and it has been realized that it is very crucial to properly design the plasmonic nanoparticles to achieve desired enhancements. In order to obtain better enhancement in TERS, one needs to match three wavelengths, namely the wavelength of the incident light, the resonance Raman wavelength of the sample and the plasmon resonance wavelength of the nanotip. When the three overlap with each other, both Raman and plasmon resonances simultaneously take place at the excitation wavelength, providing maximum possible enhancement to the scattered signal. For a given sample, one can select a laser with a wavelength that matches the resonance Raman wavelength of the sample, and hence it finally comes down on designing the nanotip in such a way that the plasmon resonance wavelength of the nanotip matches precisely with the other two wavelengths. Here, we will discuss how we design a plasmonic nanotips, where one can tune the plasmon resonance wavelength within the entire visible spectrum. We will show some interesting results on plasmon tuning and optical nanoimaging with high spatial resolution. Further, for the wide-spectrum tunability, we demonstrate the creation of a white-nano-light source at the apex of a plasmonic nano-tip. This new technique enables us not only to achieve wide-range tunability in TERS, but also allows us to do a background-free measurement. We will also demonstrate the selective detection of a possible presence of pesticide molecules on food by tuning the plasmon resonance to match the resonance Raman wavelength of pesticide molecules. We will show that we were able to detect a very tiny amount of pesticide, which was not detectable by conventional techniques.
Date & Time |
2021-07-09 10:30 ~ 11:00 |
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Place | 305 |
Speaker | Jwa Min Nam |
Affiliation | Seoul National Univerysity, KOREA |
Title | Lipid Nanotablets for Smart Biosensing and DNA Computing Applications |
Lecture Summary
I will introduce and discuss about a new molecular computing chip, lipid nanotablet (LNT), that is based on a plasmonic nanoprobe-modified lipid bilayer. The LNT platform allows for reliably tracking and controlling the interactions between plasmonic nanoparticles in situ on a synthetic cell membrane surface. It will be shown that this LNT platform is versatile and powerful in providing a modular, scalable DNA computing platform for building a nanoparticle-based computing architecture and nanoparticle neural networks that can make autonomous logic decisions. The potential for using this LNT platform for next-generation smart biosensing applications will be also discussed.
Date & Time |
2021-07-09 13:00 ~ 13:30 |
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Place | 305 |
Speaker | Young-Jin Kim |
Affiliation | KAIST, KOREA |
Title | Multi-scale Dimensional Metrology with a Frequency Comb: from Sub-nanometers to Kilometers |
Lecture Summary
This presentation will introduce how we have utilized a frequency comb for multi-scale high precision dimensional measurements, ranging from sub-nanometer-scale thermo-plasmonic motions to kilometer-scale inter-satellite-distances. The frequency comb of a femtosecond pulse laser provides a repetitive pulse train in the time domain and millions of evenly spaced optical laser modes in the frequency domain; these features enabled the endowment of Nobel Prize in Physics to frequency comb in 2005. Over the recent two decades, all the fields in precision metrology have benefited from this frequency comb technology; high-precision dimensional metrology was not an exception. In large scales, we reported nanometer-precision time-of-flight measurement for large-scale engineering and future space missions. In medium scales, precision stage positioning and dimensional inspection required in semiconductor and display industries were proven to get precision improvement from the frequency comb. In small scales, we reported that frequency comb can successfully maintain core performances in photon plasmon conversion by exploiting plasmonic extraordinary transmission through a subwavelength plasmonic hole array, so it can be used for high-resolution phase spectroscopy in the field of plasmonics for realizing picometer resolution plasmonic ruler. These series of demonstrations prove that the frequency comb will be the key technology to open the new vista of future precision metrology.
Date & Time |
2021-07-08 11:00 ~ 11:15 |
Place | 305 |
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Speaker | Sunae So | Affiliation | Pohang University of Science and Technology (POSTECH) |
Title | On-demand design of spectrally-sensitive multi-band absorbers using deep learning |
Date & Time |
2021-07-08 11:15 ~ 11:30 |
Place | 305 |
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Speaker | Inyong Hwang | Affiliation | UNIST |
Title | Ultrasensitive Surface-enhanced Infrared Absorption Spectroscopy based on Metamaterial Absorber with Vertical Nanogap |
Date & Time |
2021-07-08 11:30 ~ 11:45 |
Place | 305 |
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Speaker | Young Jin Yoo | Affiliation | Gwangju Institute of Science and Technology |
Title | Virus-coated ultra-thin colorimetric sensors for enhanced chromatic response |
Date & Time |
2021-07-08 14:00 ~ 14:15 |
Place | 305 |
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Speaker | Kyungnam Kang | Affiliation | Yonsei University |
Title | Enhanced bottom-emitting organic light-emitting diodes integrated with nanoslot metasurface |
Date & Time |
2021-07-08 14:15 ~ 14:30 |
Place | 305 |
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Speaker | Hyeongju Chung | Affiliation | UNIST |
Title | Electrically tunable quarter waveplate based on intersubband polaritonic metasurfaces |
Date & Time |
2021-07-08 14:30 ~ 14:45 |
Place | 305 |
---|---|---|---|
Speaker | Young-Ho Jin | Affiliation | KU-KIST Graduate school of Converging Science and Technology |
Title | Transmission Matrix Analysis for Decomposing High-Order Eignenmodes of Subwavelength Nanostructures. |
Date & Time |
2021-07-08 14:45 ~ 15:00 |
Place | 305 |
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Speaker | Jaehyuck Jang | Affiliation | Pohang University of Science and Technology (POSTECH) |
Title | Multifunctional metasurface for vectorial holographic color prints and its application toward optical security |
Date & Time |
2021-07-09 11:00 ~ 11:15 |
Place | 305 |
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Speaker | Vasanthan Devaraj | Affiliation | Pusan National University |
Title | How facets influence plasmonic properties in metallic nanoparticles |
Date & Time |
2021-07-09 11:15 ~ 11:30 |
Place | 305 |
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Speaker | Minkyung Kim | Affiliation | Pohang University of Science and Technology (POSTECH) |
Title | Nanophotonic platforms to control spin Hall effect of light |
Date & Time |
2021-07-09 11:30 ~ 11:45 |
Place | 305 |
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Speaker | Gil Ju Lee | Affiliation | Gwangju Institute of Science and Technology (GIST) |
Title | Hybrid plasmonics of polymer-metal for spectrally and spatially selective emitters in infrared region |
Date & Time |
2021-07-09 11:45 ~ 12:00 |
Place | 305 |
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Speaker | Guhwan Kim | Affiliation | Sungkyunkwan University |
Title | Suppressed transmission of long-range surface plasmon-polariton by TE-induced edge plasmon |
Date & Time |
2021-07-09 13:30 ~ 13:45 |
Place | 305 |
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Speaker | Incheol Jung | Affiliation | Inha University |
Title | Quad-Layered Transmissive Color Filters Creating Pure and Bright RGB Primary Colors |
Date & Time |
2021-07-09 13:45 ~ 14:00 |
Place | 305 |
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Speaker | TaeJun Ahn | Affiliation | Hankyong National University |
Title | Simulation of emissive color shift in DC voltage driven organic light-emitting diodes with a single-cell structure |
Innovating Hybrid Nanomaterials for the Next Generation Science and Technology
Key agenda for the recent progress in fusion nanotechnology and the successful development of the emerging 4th industrial revolution can include energy, environment, nanoelectronic device, sensor, and information. It is noted that hybrid nanomaterials have placed as key elements in such inter-/multi-disciplinary research and development areas. In this session, we first discuss the eye-opening advance on the design, synthesis, analysis and application of next generation hybrid nanomaterials with a focus on multidisciplenary applications, and provide a comprehensive overview on the future outlook.
- Hybrid nanomaterials for the 4th industrial revolution, 5G, IoT, and artificial intelligence
- Alternative materials and devices platform for new energy resources
- Hybrid nanomaterials for environmental nanotechnology
- Next-generation nanomaterials for optics, photonics, and sensors
- Unconventional hybrid nanomaterials with extraordinary configurations and functions
Date & Time |
2021-07-07 09:00 ~ 09:30 |
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Place | Online |
Speaker | Zhiqun Lin |
Affiliation | GeorgiaTech, USA |
Title | Monodisperse Hairy Nanocrystals via Nonlinear Block Copolymer Nanoreactors for Self-Assembly, Solar Cell, Battery and Electrocatalysis |
Lecture Summary
Nanocrystals exhibit a wide range of unique properties that depend sensitively on their size and shape. In this talk, I will elaborate several general and robust strategies for crafting a rich variety of functional 0D, 1D, shish-kebab, and Janus nanocrystals with precisely controlled dimensions, compositions, architectures, and surface chemistry by capitalizing on a set of judiciously designed unimolecular star-like, bottlebrush-like, worm-like, and Janus block copolymers, respectively, as nanoreactors. These strategies are effective and able to produce oil-soluble and water-soluble as well as stimuli-responsive monodisperse nanocrystals, including metallic, ferroelectric, magnetic, luminescent, semiconductor, perovskite, and their core/shell structures. The applications of these functional nanocrystals in self-assembly, control release, and energy conversion and storage (e.g., perovskite solar cells, LEDs, batteries, electrocatalysis, etc.) will also be discussed.
Date & Time |
2021-07-07 10:30 ~ 11:00 |
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Place | 304 |
Speaker | Jeong Ho Cho |
Affiliation | Yonsei University, KOREA |
Title | Vertically Stacked Graphene–Semiconductor Heterostructures for Large-Area Schottky Barrier Transistors |
Lecture Summary
We demonstrate a new device architecture for flexible vertical Schottky barrier (SB) transistors and logic gates based on graphene–semiconductor–metal heterostructures and ion gel gate dielectrics. The vertical SB transistor structure was formed by (i) vertically sandwiching a semiconductor layer between graphene (source) and metal (drain) electrodes and (ii) employing a separate coplanar gate electrode bridged with the vertical channel through an ion gel. Various kinds of semiconductors such as transition mechanically-exfoliated metal dicharcogenides (MoS2 and WSe2), vacuum-deposited organic semiconductors (pentacene and PTCDI-C8), solution-processed indium-gallium-zinc-oxides, and polymer semiconductors were successfully applied as a vertical channel materials. The channel current was controlled by adjusting the SB height at the graphene/semiconductor heterojunction under application of an external gate voltage. The high intrinsic capacitance of the ion-gel gate dielectric facilitated modulation of the SB height at the source/channel heterojunction to around 0.5 eV at a gate voltage lower than 2 V. The resulting vertical SB transistors exhibited a high current density, a high on−off current ratio, and excellent operational and environmental stabilities. The simple structure of the unit transistor enables the successful fabrication of low-power logic gates based on device assemblies, such as the NOT, NAND, and NOR gates, prepared on a flexible substrate. The facile, large-area, and room-temperature deposition of both semiconductors and gate insulators integrates with transparent and flexible graphene opens up new opportunities for realizing graphene-based future electronics.
Date & Time |
2021-07-07 13:30 ~ 14:00 |
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Place | 304 |
Speaker | Ho Seok park |
Affiliation | Sungkyunkwan University, KOREA |
Title | 2D Pseudocapacitive Nanomaterials for High Energy- and High Power-Oriented Applications of Supercapacitors |
Lecture Summary
Supercapacitors (SCs) are an electrochemical energy storage device that can fill the gap between batteries and electrolytic capacitors. However, the widespread applications of commercialized carbonbased SCs are limited by their energy density, arising from their physical charge storage mechanism, which is by far lower than that of batteries. Moreover, the high-power applications of SCs are also limited by the slower kinetics than electrolytic capacitor due to the diffusion and distribution of ions onto the tortuous porous surface.
In this talk, I will introduce our recent progress on the rational design of 2D pseudocapacitive materials for high energy- and high power-oriented SCs applications. Firstly, I will address our contribution to the improvement of pseudocapacitance by the molecular level surface redox sites of 2D pseudocapacitive nanomaterials such as P-doped graphene and black phosphorus. In addition to energy aspect, we will focus on the kinetics feature of 2D MXenes, correlating with the multiscale structure and chemistry for ultrahigh power and high frequency response.
Date & Time |
2021-07-08 10:00 ~ 10:30 |
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Place | 304 |
Speaker | Ki Tae Nam |
Affiliation | Seoul National Univerysity, KOREA |
Title | Chirality Control in Single Gold Nanoparticle |
Lecture Summary
Chiral structure controlled at nanoscale provides a new route to achieve intriguing optical properties such as polarization control and negative refractive index. However, asymmetric structure control with nanometer precision is difficult to accomplish due to limited resolution and complex processes of conventional methods. Here, we demonstrated novel chiral gold nanostructures exploiting chirality transfer between peptide and high-Miller-index gold surfaces. Enantioselective adsorption of peptides results in unequal development of nanoparticle surface and this asymmetric evolution leads to highly twisted chiral element in single nanoparticle making unprecedented 432 helicoid morphology. The synthesized helicoid nanoparticle showed strong optical activity which was substantiated by distinct transmittance color change of helicoid solution under polarized light.
Date & Time |
2021-07-08 11:00 ~ 11:30 |
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Place | Online |
Speaker | Sang-Hyun Oh |
Affiliation | University of Minnesota, USA |
Title | Ultrastrong light-matter interactions via polaritons in 2D materials |
Lecture Summary
We will present new approaches to design and fabricate resonant nano-cavities and manipulate plasmons and phonon-polaritons. First, we will present experimental results on plasmon-phonon ultrastrong coupling in epsilon-near-zero coaxial ring cavities. Next, we will describe a new device structure – ‘image polariton’ resonator – that can be coupled with graphene, boron nitride, or other 2D materials to probe ultraconfined polaritons with high coupling efficiency. Potential applications of these engineered nanocavities include infrared sensing, molecular fingerprinting, photodetection, nonlinear optics, and on-chip waveguide integration.
Date & Time |
2021-07-08 13:30 ~ 14:00 |
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Place | Online |
Speaker | Misawa Hiroaki |
Affiliation | Hokkaido University, JAPAN |
Title | Enhanced water oxidation reaction under strong coupling conditions |
Lecture Summary
Photoanodes that are effective in oxidizing water under visible light play an important role in construction of artificial photosynthesis systems such as overall water splitting, N2 fixation systems and so on.
In particular, gold nanoparticles (Au-NPs) loaded on titanium dioxide (TiO2) semiconductor system has been attracting much attention because it can absorb visible light due to localized surface plasmon resonance (LSPR) of Au-NPs. Such plasmonic Au-NPs not only function as a light-absorbing unit but also promote plasmon-induced hot carriers generation, and the charge separation of those hot carriers takes place at the Au-NPs/TiO2 interface, followed by reduction/oxidation reactions. However, the LSPR of a monolayer Au-NPs on a TiO2 substrate cannot achieve sufficient and broad-band light absorption, and the quantum yield of water oxidation reaction is still low.
Recently, we have developed a novel photoanode that utilized strong coupling between LSPR and Fabry–Pérot (FP) nanocavity to solve the issues of plasmonic water oxidation. In addition to increasing the absorption efficiency and broadening the absorption wavelength range, we also succeeded in improving the quantum yield of water oxidation reaction. The structure of the photoanode that exhibits strong coupling consists of Au-NPs/TiO2 thin film/Au-film (ATA). A component of the photoanode, TiO2 thin film/Au-film, act as a FP nanocavity. Strong coupling is induced when the resonant wavelengths of the nanocavity and the LSPR of Au-NPs match each other closely.
In my talk, the coupling strength of strong coupling system that depends on the number of Au-NPs per unit area will be introduced. In addition, using Au/Ag alloy NPs as a plasmonic component in the strong coupling photoanode to increase the coupling strength and the water oxidation reaction efficiency will also be talked.
Date & Time |
2021-07-08 15:00 ~ 15:30 |
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Place | 304 |
Speaker | Jihyeon Yeom |
Affiliation | KAIST, KOREA |
Title | Chiral Nanomaterials for Next Generation Bio-Science and Technology |
Lecture Summary
Chirality is ubiquitous in nature and is hard-wired into every living biological system. The well-known examples are L-type amino acids and D-type nucleic acids and glycans. Since the chirality of building blocks decides the handedness of assembled structures, proteins such as enzymes and receptors are also chiral. Importantly, their chiral structures are closely related to their biological properties. For example, depending on the chirality of molecules that are consumed or reach the taste buds or olfactory receptors, they taste sweet or bitter, and smell differently. These chiral-sensitive receptors are not just limited to the tongue or nose, but distributed in the stomach, intestine, and pancreas that govern overall physiology. Likewise, chirality is an important architectural consideration to build an effective artificial enzyme. There have been enormous efforts to mimic enzymatic functionalities by developing artificial structures to utilize them under relatively harsher conditions than that in the body. However, due to the limited stability and the lack of high selectivity, it has still remained challenging. Using inorganic materials is a powerful strategy to solve these problems. Due to the thick electron clouds, inorganic materials show high catalytic activity, sensitivity, and stronger interactions with electric, electromagnetic and magnetic fields that amplify the signal. Thus, nanostructures designed with inorganic materials and biomimetic properties will offer efficient signal transition/ amplification, higher chemical and physical tolerance, and multi-functionality. In the talk, I will convey how chiral engineering using inorganic nanostructures will provide “smart” platforms, a new level of control for drug delivery systems, tumor detection markers, biosensors, and other biomaterial based devices.
Date & Time |
2021-07-08 15:30 ~ 16:00 |
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Place | Online |
Speaker | Luis M. Liz-Marzan |
Affiliation | Luis M. Liz-Marzan, SPAIN |
Title | Nanomaterials with Plasmonic Chirality |
Lecture Summary
The field of chirality has seen a strong rejuvenation due to the observation of nanoscale chirality in plasmonic nanoparticles. This lecture will highlight recent advances in the field of plasmonic chirality, including novel methods for the synthesis of optically active plasmonic nanomaterials. The focus will be first directed toward the directed self-assembly of gold nanorods into chiral nanostructures, using amyloid fibers as templates, as well as potential application for such nanomaterials in the diagnosis of neurodegenerative disorders. We will also introduce the chiral synthesis of colloidal nanoparticles with chiral morphology. The self-organization of surfactant micelles on nanoparticle seeds offers a wide range of possibilities, which have been studied in the context of the seeded growth of metal nanoparticles. Through the addition of chiral co-surfactants, quasi-helical micelles are obtained, which wrap around gold nanocrystals and template seeded growth into chiral features. The resulting chiral nanoparticle colloids display optical handedness, which can be tuned through the visible and the near IR. This approach thus provides an appealing method toward the fabrication of nanoparticles with high chiral optical activity.
Date & Time |
2021-07-09 10:00 ~ 10:30 |
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Place | 304 |
Speaker | Joo-Ho Moon |
Affiliation | Yonsei University, KOREA |
Title | Photoelectrochemical water splitting towards efficient solar hydrogen production |
Lecture Summary
To achieve a high solar-to-hydrogen (STH) conversion efficiency, strategies towards high photocurrent together with sufficient onset potential should be developed. Herein, we report a SnS semiconductor as a high-performance photocathode. Utilizing a sulfur precursor with a weak dipole moment generates high-quality dense SnS nanoplates with enlarged favorable crystallographic facets and suppress anisotropic growth. Furthermore, the introducing Ga2O3 layer between SnS and TiO2 in SnS photocathodes efficiently improves the charge transport kinetics without charge trapping. The SnS photocathode reveals the highest photocurrent density of 28 mA cm−2 at 0 V versus the reversible hydrogen electrode. In this study, for the first time, we demonstrated overall solar water splitting by combining an optimized SnS photocathode with a Mo:BiVO4 photoanode, achieving a STH efficiency of 1.7% and long-term stability of 24 h. The high-performance and low-cost SnS photocathode represents a promising new material in the field of photoelectrochemical solar water splitting. Solar water splitting directly converts solar energy into H2 fuel that is suitable for storage and transport. We further develop elaborate strategies yielding a high photocurrent in a tandem configuration along with sufficient photovoltage. Highly efficient solar water splitting devices based on emerging low-cost Sb2Se3 photocathodes coupled with semitransparent perovskite photovoltaics were demonstrated. A state-of-the-art Sb2Se3 photocathode exhibiting efficient long-wavelength photon harvesting enabled by judicious selection of junction layers was employed as a bottom absorber component. The top semitransparent photovoltaic cells, i.e., parallelized nanopillar perovskites using an anodized aluminum oxide scaffold, allowed the transmittance, photocurrent, and photovoltage to be precisely adjusted by changing the filling level of the perovskite layer in the scaffold. The optimum tandem device, in which similar current values were allocated to the top and bottom cells, achieved an STH conversion efficiency exceeding 10% by efficiently utilizing a broad range of photons at wavelength over 1000 nm.
Date & Time |
2021-07-09 10:45 ~ 11:15 |
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Place | 304 |
Speaker | Hyeon-Jin Shin |
Affiliation | Samsung Advanced Institute of Technology, KOREA |
Title | Ultralow-κ dielectrics: Past, Present, and Future |
Lecture Summary
Decrease in processing speed due to increased resistance and capacitance delay is a major obstacle for the down-scaling of interconnects. In this talk, we will introduce 3nm thick amorphous boron nitride (a-BN) films with ultralow-κ (ULK) values of 1.78 at operation frequencies of 100 kHz without pore. The films are mechanically and electrically robust, with a breakdown strength of 7.3 MV/cm, which exceeds requirements. Cross-sectional
imaging reveals that amorphous boron nitride prevents the diffusion of cobalt atoms into silicon under very harsh conditions, in contrast to reference barriers. In addition, we will discuss the past, present, and future of ULK.
Date & Time |
2021-07-09 11:30 ~ 12:00 |
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Place | 304 |
Speaker | Min Seok Jang |
Affiliation | KAIST, KOREA |
Title | Real-space imaging of acoustic plasmons in large-area CVD graphene |
Lecture Summary
An acoustic graphene plasmon (AGP) supported by a heterostructure comprising of a metal, a thin dielectric spacer, and a graphene layer is mostly confined in the dielectric and does not exhibit a cutoff when spacer thickness reduces to a ~1 nm scale. Therefore, AGP provides an unexcelled mode volume confinement factor up to ~1010, outperforming all known polaritonic modes in 2D materials. So far, AGP probing has been demonstrated either in the far-field regime in mid-IR, or via the near-field-mediated photocurrent measurements at THz frequencies.
We report on the first near-field optical imaging of AGP, employing a scattering-type scanning near-field optical microscope (s-SNOM) in the mid-IR. We directly measure the AGP dispersion and propagation loss, and investigate its behavior in a periodic structure. Most importantly, our results reveal a small damping rate of infrared AGP even when unprotected large-area CVD graphene is used at ambient conditions. The probed AGP mode is up to 2.3 times more compressed, yet exhibits a 1.4 times lower damping rate than the graphene surface plasmon under similar conditions. Our results highlight the importance of AGP as a superior plasmonic species as compared to the graphene surface plasmons, and suggest exceptionally promising prospects for creation of large-area graphene-based optoelectronic devices operating in the mid-IR.
Date & Time |
2021-07-07 09:30 ~ 09:45 |
Place | 304 |
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Speaker | Joonho Bang | Affiliation | Sungkyunkwan University |
Title | Interacting magnetic interstitial electrons in ferrimagnetic two-dimensional mixed-cation electride |
Date & Time |
2021-07-07 09:45 ~ 10:00 |
Place | 304 |
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Speaker | Kyungwha Chung | Affiliation | Sungkyunkwan University |
Title | Toward oxidation-free copper nanoparticles in air with excess electrons |
Date & Time |
2021-07-07 11:00 ~ 11:15 |
Place | 304 |
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Speaker | Junseong Song | Affiliation | Sungkyunkwan University |
Title | Design and synthesis of a new layered material by dimensional manipulation of crystal structure |
Date & Time |
2021-07-07 11:15 ~ 11:30 |
Place | 304 |
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Speaker | Jihyun Kim | Affiliation | Sungkyunkwan university |
Title | High-Performance Solution-Processed MoS2 Photodetector for Broadband Sensing via Precursor-Assisted Chemical Welding |
Date & Time |
2021-07-07 14:00 ~ 14:15 |
Place | 304 |
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Speaker | Dohyub Jang | Affiliation | Korea University |
Title | Photothermal and photodynamic Cancer Therapy using NIR-triggered Anisotropic Gold Nanobipyramids/Anatase TiO2 |
Date & Time |
2021-07-07 14:15 ~ 14:30 |
Place | 304 |
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Speaker | Tomoya Oshikiri | Affiliation | Hokkaido University |
Title | Fabrication of gold-nanoparticle/nickel oxide/platinum-film photocathode with modal coupling between plasmon and nanocavity |
Date & Time |
2021-07-08 10:30 ~ 10:45 |
Place | 304 |
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Speaker | Minju Kim | Affiliation | Ewha Womans University |
Title | Enhanced Photoluminescence from Upconversion Nanoparticle-Sensitized Perovskite Quantum Dots in Metal-Insulator-Metal Configuration under NIR Excitation by Gap Plasmonic Effect |
Date & Time |
2021-07-08 10:45 ~ 11:00 |
Place | 304 |
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Speaker | Subin Yu | Affiliation | Ewha Womans University |
Title | Anisotropic Gold Nanostructures Decorated with Upconversion Nanopartice for Cancer Treatment Induced by Plasmon-enhanced Upconversion Emission |
Date & Time |
2021-07-08 14:00 ~ 14:15 |
Place | 304 |
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Speaker | Filipe Marques Mota | Affiliation | Ewha Womans University |
Title | Towards practical CO2-containing Li–O2 Batteries: Assessing the Promise of a Br3–/Br2-based Redox Mediator |
Date & Time |
2021-07-08 14:15 ~ 14:30 |
Place | 304 |
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Speaker | Dorleta Jimenez de Aberasturi | Affiliation | CICbiomaGUNE |
Title | Inorganic-organic hybrid materials for biomedicine |
Date & Time |
2021-07-09 10:30 ~ 10:45 |
Place | 304 |
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Speaker | Da Hwi Gu | Affiliation | UNIST |
Title | Colloidal Suprastructures Self-Organized from Oppositely Charged All-Inorganic Nanoparticles |
Date & Time |
2021-07-09 11:15 ~ 11:30 |
Place | 304 |
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Speaker | Woo Yong Choi | Affiliation | UNIST |
Title | Thiometallate precursors for the synthesis of supported Pt and PtNi nanoparticle electrocatalysts: Size-focusing by S capping |
Implementation of Nanotechnology through Nanofabricaton & Measurements
For the implementation of nanotechnology, nanomaterials and manufacturing processes are key factors. Also, for the solid research of materials, structures, components and modules, the measurement and analysis technology are essential including phsyical, chemical, electrical methods. This session will be an opportunity to present and discuss about the latest research results on nanofabrication and measurements, including various technologies such as synthesis, process, integration and and characterization based on nanotechnology.
- Fabrication process or equipment for nano or multi-scale structures
‑ Manufacturing process for various applications (semiconductor, display, biosensor, energy or optical device, etc)
‑ Integration/assembly process for device or system with nano scale structures or components
‑ Measurement and characterization of nanomaterials, structures, and devices
‑ Emerging fabrication or measurement technologies
Date & Time |
2021-07-07 13:00 ~ 13:30 |
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Place | Online |
Speaker | Emmanuel Debois |
Affiliation | IEMN, FRANCE |
Title | Functional packaging of RF, mmW and photonic functions based on femtosecond laser micromachining |
Lecture Summary
The increasing difficulty to pursue the aggressive objectives of Moore's law (More-Moore) has in parallel favored the emergence of integration solutions grouped under the term More-than-Moore, allowing to enrich silicon technologies by heterogeneous co-integration with new functionalities such as mixed digital/analog/RF/mmW circuits, antennas, sensors, actuators, embedded memory and other various microsystems). Still, it is clear that the performance of electronic systems (SoB - Systemon-Board) is far from having followed the same progression, thus marking a gap with monolithic nanometric CMOS technologies. To bridge this gap, it is now a question of producing gains in functionality, performance and compactness at the system level by heterogeneous integration of components in elemental system building blocks. Sometimes referred to as ‘System Moore’, this approach thus conceives the package not only as a simple encapsulation function but more precisely integrates the package as a functional system block. The dimensional level of functional packaging typically covers the 1-1000 µm range for which the use of microelectronics fabrication techniques are oversized, expensive and unable to efficiently handle thicknesses of a few tens of microns. In this context, laser micromachining is an increasingly used tool for micro/nanostructuring of materials for the packaging of integrated functions in photonics, microelectronics, RF and mmW. In this paper, we will first provide an overview of laser machining techniques in microelectronics and we will detail
the main characteristics of this technique with respect to the laser source and beam conditioning. It will be shown that the use of ultrashort laser processing with pulse width in femtosecond range is advantageous because it can be applied to a virtually unlimited range of materials like metals,
semiconductors, dielectrics, alloys, and ceramics. The range of surface processing is diverse varying from a small scale (a few nm2) to large scale (a few mm2). The unwanted heat affected zone is greatly reduced for ultrashort lasers which allows for enhanced machining quality with low thermal impact of laser radiation on material. In a second step, we detail a selection of laser micromachining applications allowing either to increase the performance of RF and mmW components, or to introduce an innovative and distinctive manufacturing method promoting compactness and cost reduction:
i) The first illustrated application is the fabrication of ultra-thin free standing membranes of SOICMOS RF circuits/functions on Silicon-on-Insulator (SOI) wafers. It will be shown that tremendous performance improvements can be obtained on a range of RF components like integrated inductances and power switches as well as in terms of cross-talk reduction.
ii) The second example describes the packaging of an electro-optical transceiver using a glass electrooptical interposer to connect a silicon photonic chip to a single mode optical fiber.
iii) Finally, the third illustration covers the fabrication of structures integrating mmW waveguides in G and J band [140-220 GHz, 220-320 GHz] with silicon chips and transitions allowing the conversion from coplanar to a guided mode in rectangular waveguides (WR5.1 and WR3.1).
Date & Time |
2021-07-07 13:30 ~ 14:00 |
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Place | 307 |
Speaker | Soon Wook Kim |
Affiliation | Samsung Electronics, KOREA |
Title | Spearheading semiconductor packaging technology as creative destruction |
Lecture Summary
The vacuum tube was the basic electronic component, which made possible new enormous invention such as radio, television, and telephone in the 1940s. The first electronic digital computer, ENIAC was based on this vacuum tube. However, the breakthrough came from the invention of the transistor, which opened the new era of solid-state microelectronics by destructing the previous vacuum tube industry. Even if the transistor was a huge revolution from the previous technology of vacuum tube, this off-chip transistor production was also replaced by the planar type of modern transistor which was evolved as integrated circuits (IC) invented by Jack Kilby and Robert Noyce in 1958/1959. In the solid-state microelectronics history during > 70 years, new products have literally been killing off older products in a process of creative destruction, which is famous concept of Joseph Schumpeter. It means the 2D patterning technology has gradually scaled down to meet the profitably industrial production together with the diameter increase of thin-slice semiconductor wafer size over half century. However, the planar scaling according to Moore’s law retards and faces the physical dimension limitation with the exponential cost increase. In an economical viewpoint, some chipmakers already announced no more investment on the conventional pitch scaling competition. In other words, it is time to start reconsidering the gaming rule not toward 2D shrinkage but 3D compact integration. The vertical device architecture should be most effectively achieved by advanced semiconductor packaging technology. The major candidates as new semiconductor nanofabrication process can be presented and discussed to lead a future semiconductor platform technology
Date & Time |
2021-07-07 14:00 ~ 14:30 |
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Place | 307 |
Speaker | Sanghyeon Kim |
Affiliation | , KOREA |
Title | Monolithic 3D integration for high-frequency applications |
Lecture Summary
Recently, huge demand for the next generation communication has led a megatrend to increase the operating frequency of radio frequency (RF) devices and integrate several functions in a single chip. Recent studies have provided analog-digital mixed-signal system on chip (SoC) based on Si CMOS and advanced packaging technology, but these approaches have several technical challenges. As the Si CMOS technology confronts its scaling limit, it is quite challenging to further improve the RF performance of Si CMOS. Also, a complex design and process are essential to reduce substrate coupled digital noise. Furthermore, the packaging technology has a fundamental drawback of the long interconnect, high loss, and high power consumption. To overcome the limitation of conventional mixed-signal systems, an M3D integrated mixed-signal system is emerging as one of the strongest potential solution. Therefore, in this study, we propose and discuss the InGaAs HEMTs on Si CMOS for the substrate coupling noise-free M3D mixed-signal IC.
Date & Time |
2021-07-08 10:00 ~ 10:30 |
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Place | 307 |
Speaker | Byung Chul Lee |
Affiliation | KIST, |
Title | Elastic Deformation Study of Wafer-scale Nanofabricated Silicon |
Lecture Summary
As the critical backbone material of recent information technology, silicon is extensively used as a structural material in micro- and nano-systems. Although many research studies have reported superior elastic strain in silicon nanostructures such as nanowires, nanomembranes, and nanoribbons, the fabrication techniques on the silicon nanostructures and their related mechanical properties are not fully understood.
In this lecture, whole wafer-scale uniform nano-scale silicon posts using a conventional microfabrication process will be demonstrated. A combined fabrication technique of DRIE and size-reduced RIE could control the sub-micron and nanometer post dimensions. Unlike using the expensive e-beam lithography, this fabrication technique provided cost-effectiveness because a conventional photomask with a minimum feature size of 2.0 μm was used for whole wafer-scale photolithography. Furthermore, we will discuss the measurement method to gain the elastic deformation of the fabricated structures. In-situ nanomechanical tests of the fabricated silicon posts were processed using a pico-indenter monitored under scanning electron microscopy. Also, some measurement issues with this pico-indenter measurement and some suggesting solutions will be addressed. Finally, I will provide potential applications of these nanometer silicon posts for applying to the MEMS-based ultrasonic transducers from the measurement results.
Date & Time |
2021-07-08 10:30 ~ 11:00 |
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Place | 307 |
Speaker | Jeong-Ik Lee |
Affiliation | ETRI, KOREA |
Title | Micrometer Pixel Displays for Digital Reality |
Lecture Summary
Display can be developed as a trend of maximizing realism, diversifying the use environment, and converging with various functions. In order to maximize the sense of realism, efforts to improve image quality such as resolution, color reproduction capability, and contrast ratio of flat panel displays, as well as technology development for space displays which can express three-dimensional images, are steadily progressing. As AR/VR and Metaverse services attract much attentions, high resolution panels to show high quality or 3D images with small form factor are getting more important.
Organic light-emitting diode(OLED) microdisplays have attracted much attention due to self-emission property which can lead to small form factor devices as well as good image quality. In ETRI, we have developed 1280x1034 (SXGA) and 1920x540 (32:9 ratio) resolution OLED microdisplays with the sub pixel size of 3.4 or 3.6 micrometer. The small form factor display can be applied to glass like AR devices. Moreover, 1 micrometer pixel pitch spatial light modulator has been developed, which was applied to digital holography. The micrometer pixel panel could result in a wider field of view (~30 degree) digital hologram than ever before. In this presentation the detailed results on micrometer pixel displays for digital reality will be discussed.
Date & Time |
2021-07-08 13:00 ~ 13:30 |
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Place | Online |
Speaker | Tung-Huei Ke |
Affiliation | IMEC, Belgium |
Title | Scaling and integration of organic and hybrid electronic by advanced photolithography |
Lecture Summary
Organic and hybrid electronics have shown great potentials in applications including large area imager, thin film circuits, and displays in the past few decades. To bring the technology level of organic electronics to a market acceptable status, it is very important to integrate the organic electronics in an industrial compatible process flow. Photolithography is a well-known method to create high resolution patterns with high throughput in semiconductor industry. In this presentation, we will present our OTFT developments for thin film circuits applications, such as microprocessor and RFID. We will also present the latest development in imager for fingerprint sensor applications. Furthermore, we will show our developments in patterning organic semiconductors for OLED applications to realize high resolution OLED pixels side-by-side with high aperture ratio for the future mobile and AR/VR display.
Date & Time |
2021-07-08 13:30 ~ 14:00 |
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Place | 307 |
Speaker | Woosung Park |
Affiliation | Sookmyung Women's University, KOREA |
Title | Thermal Challenges in Semiconducting Devices: from Heat Generation to its Dissipation |
Lecture Summary
With decreasing feature sizes along “Moore’s law” and the associated increase in power density,[1] heat dissipation is arguably the most important problem facing electronic chips today. The thermal conduction within a chip comprises multi-stage challenges from devices into the substrate. The propagation is further impeded by transistors and neighboring interconnects as principles break down at the length scale. To tackle such thermal challenges, for decades, a significant effort has been made from nanoscale thermal characterization to engineering fabrication process. This presentation comprises into three parts: a direct quantification of heat generation due to incident of high energy electrons, thermal transport in nanomaterials, and our approaches to improve thermal transport in an atomic film.
First, I will discuss the origin of heat generation due to electron conduction.[2] To directly capture the heat generation, we specifically design and develop a nanowatt calorimeter, compatible with a transmission electron microscopy. In combination of the calorimeter and electron energy loss spectroscopy, we unveil the origin of heat generation show that the characteristic length scale contributing to heat generation is longer than those for the other inelastic phenomena. The second part of this talk will discuss quasi-ballistic phonon transport in nanostructured materials. I also discuss the modification of phonon transport characteristics from Brownian motion to Levy walk due to increased boundary scattering with large axial angles. The last part will introduce an approach to improve electronic and thermal properties of atomic thin films with the modulation of plasma treatment. In this work, a substrate bias during plasma exposure serves as a temporally selective heat treatment during atomic layer deposition, extending a processing temperature.[3]
References
[1] I. Ferain, C. A. Colinge, J.-P. Colinge, Nature 2011,479, 310.
[2] J. Park, K. Bae, T. R. Kim, C. Perez, A. Sood, M. Asheghi, K. E. Goodson, W. Park, Advanced Science 2021,8, 2002876.
[3] Y. Kim, H. Kwon, H. S. Han, H. J. K. Kim, B. S. Kim, B. C. Lee, J. Lee, M. Asheghi, F. B. Prinz, K. E. Goodson, ACS Applied Materials & Interfaces 2020,12, 44912.
Date & Time |
2021-07-08 11:15 ~ 11:30 |
Place | 307 |
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Speaker | Sumin Lee | Affiliation | Seoul National University |
Title | Transformation of 2D pen drawing into 3D structures |
Date & Time |
2021-07-08 11:30 ~ 11:45 |
Place | 307 |
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Speaker | Hyunwoo Kim | Affiliation | KRICT |
Title | Nanotip Indentation Lithography Fabrication for Plasmonic Nanoparticles |
Date & Time |
2021-07-08 11:45 ~ 12:00 |
Place | 307 |
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Speaker | Jeong-Sik Jo | Affiliation | Dongguk university |
Title | On-demand fabrication of Si nano/microstructures by scanning probe lithography combined with metal-assisted chemical etching |
Date & Time |
2021-07-08 14:00 ~ 14:15 |
Place | 307 |
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Speaker | Sang-Joon Cho | Affiliation | Park Systems Corp. |
Title | The importance of automation and AI in nano metrology and lithography with SPM |
Date & Time |
2021-07-08 14:15 ~ 14:30 |
Place | 307 |
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Speaker | Bu Si Im | Affiliation | SungKyunKwan University |
Title | Fabrication of a transparent and conductive Ag nanoparticle based electrode by electrohydrodynamic jet printing |
Date & Time |
2021-07-08 14:30 ~ 14:45 |
Place | 307 |
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Speaker | Ha Neul Kim | Affiliation | Hanyang university |
Title | Evaluating optical/mechanical properties of single MoSi2 EUV pellicle |
Date & Time |
2021-07-08 14:45 ~ 15:00 |
Place | 307 |
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Speaker | Oh Nyoung Hur | Affiliation | Soongsil University |
Title | Effect of Varying Three-Roll Milling Time on Mechanical and Electrical Properties and Filler Length of Single-Walled Carbon Nanotube/Polymer Composites |
Date & Time |
2021-07-08 15:00 ~ 15:15 |
Place | 307 |
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Speaker | Hyunwoo Kim | Affiliation | Soongsil university |
Title | Influence of aspect ratio on piezo-resistance properties of aligned carbon nanotube polymer composites |
Date & Time |
2021-07-08 15:15 ~ 15:30 |
Place | 307 |
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Speaker | ByungHo Kang | Affiliation | Soongsil University |
Title | EMI shielding effect of exfoliated-NbSe2 via lithium intercalation process |
Date & Time |
2021-07-08 15:30 ~ 15:45 |
Place | 307 |
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Speaker | Dong-Young Kim | Affiliation | Soongsil University |
Title | Piezoresistive Properties of Wide Range Pressure Sensor with Truncated Cone Pattern |
Research and Standardization for Nano EHS
With the recent advancements in nanosciences and nanotechnologies, an increasing number of nanoproducts have been commercialized and introduced in our everyday life. However, as the potential hazards of these novel technologies have not yet been fully understood, concerns on their effects on human health and the environment are mounting. In addition, there is a need to develop solutions using nanotechnology for all environmental issues in situations where serious air pollution and water pollution are due to fine dust and fine plastics. In this session, we will introduce some recent excellent research in the nanosafety, nanostandards, and environmental fields, and provide sessions for discussions that can contribute to the development of safe and sustainable nanotechnologies and the resolution of environmental problems.
- Safety of Nanomaterial and Nanoproducts
- Fate of nanomaterial in Environment
- Standardization of Nanotechnology
- Regulation of Nanotechnology
- ELSI(Ethical, Legal, Societal Implications) of Nanotechnology
Date & Time |
2021-07-07 11:00 ~ 11:30 |
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Place | 209 |
Speaker | Younghun Kim |
Affiliation | Kwangwoon University, KOREA |
Title | Potential release of carbon black nanoparticles from tire-wear particles |
Lecture Summary
With increasing concern about air quality in the government, particulate matter (PM) is considered one of the most problematic pollutants for human health. The major source of PM in urban areas is particles from the exhaust emission of vehicles. As exhaust PM emissions, containing a variety of hydrocarbons, could lead to respiratory disease, the governments have restricted the concentration of vehicular emission via the Environmental Act. Additionally, in order to reduce air pollution, users of vehicles with internal combustion engines have been encouraged to switch to electric vehicles (EVs) by incentivizing purchase subsidies. While exhaust PM emissions will approach zero in EVs, the total emission level of PM by switching to EV may not reduce as expected. The emission factor of PM (3.7-7.2. mg/km) for EVs is almost the same as that for diesel engine vehicles (2.9-6.1. mg/km). Notably, there is another crucial source of PM apart from exhaust derived PM; namely, non-exhaust sources, such as tire-wear, break-wear, road surface wear, and dust resuspension, act as major airborne pollutants.
Major non-exhaust sources including tire-wear and break-wear were related to carbon black (CB) due to their use as reinforcing agents in tire and break-pads. Thus, CB could be considered as the main component of non-exhaust PM. Although several toxicological studies have been reported on lung-inflammation by non-exhaust PM, CB particles released from tire-wear were of no interest to toxicologists as it is considered to be tightly bound in the rubber tire matrices. Similar arguments can be found in government reports; exposure to free-bound CB does not occur during the use of products wherein CB is bound to other matrices, and CB is generally bound within the rubber of a tire. These reports insisted that unbound CB is not generally released into the environment from tire-wear. However, tire-wear particles (TWP) can become fragmented by weathering effects, such as continuous abrasion on the road, resuspension of road dust, and temperature changes. Therefore, additional wear could release the CB tightly bound within the tire rubber into the environment in a free-bound form.
Herein, we investigated the potential release of nano-CB and the formation of unbound CB from TWP through weathering. Ball milling is used as green technology to prepare the free-standing nanoparticles and de-agglomeration of nanoparticles. TWP was obtained through the surface abrasion of commercial passenger car tires using steel graters; the grinding work for the obtained particles was conducted for 14 days using ball milling instruments. Nano-sized particles were obtained from the parent TWP with increasing milling time, and the presence of CB was confirmed by conducting various characterizations of secondary particles. Additionally, the particle size was measured in real time around highways, and the samples collected on the highway were analyzed for the existence of free-bound CB in the environment.
Date & Time |
2021-07-07 13:00 ~ 13:30 |
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Place | 209 |
Speaker | Jae Won Lee |
Affiliation | KCL, KOREA |
Title | Oral Toxicity Study and Skin Sensitization Test of reduced Graphene Oxide |
Lecture Summary
Graphene is a nanomaterial in which carbon atoms are arranged in hexagonal structures, which is recognized as the best novel material among existing materials for its high strength and electron mobility, and competition for technology development is fierce around the world wide. Therefore, graphene can be applied to the diverse industries such as transparent flexible display, airplane, battery, semiconductor, and an ultra-light car; however, safety evaluation data on graphene is currently limited. Here, we performed general toxicity studies of reduced graphene oxide including a single and 4-week repeated dose toxicity test in Sprague-Dawley rats, and a skin sensitization test in guinea pigs following the Organization for Economic Cooperation and Development (OECD) test guidelines 406 and 407 in addition to Good Laboratory Practice.
To investigate the NOAEL and target organs of reduced graphene oxide, Sprague-Dawley rats were allocated to 4 groups: vehicle control (0.5% BSA solution), 35 mg/kg, 70 mg/kg, 140 mg/kg dose test groups and reduced graphene oxide was administered over 4 weeks after single dose in rats based on the results of the single oral administration toxicity study in rats. The results of the study showed that the NOAEL of reduced graphene oxide was 140 mg/kg for both sexes of rats without adverse effects in a 4-week repeated oral toxicity study and there was no skin hypersensitivity reaction in guinea pigs. Therefore, our results reveal the potential for safe application of graphene to various industries.
Date & Time |
2021-07-07 13:30 ~ 14:00 |
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Place | 209 |
Speaker | Tae Hyun Yoon |
Affiliation | Hanyang University, KOREA |
Title | Mass Cytometry and Single-Cell RNA-seq Profiling of the Heterogeneity in Human Peripheral Blood Mononuclear Cells Interacting with Silver Nanoparticles |
Lecture Summary
Understanding the interactions between nanoparticles (NPs) and human immune cells is necessary for justifying their utilization in consumer products and biomedical applications. However, conventional assays may be insufficient in describing the complexity and heterogeneity of cell–NP interactions. Herein, mass cytometry and single-cell RNA-sequencing (scRNA-seq) are complementarily used to investigate the heterogeneous interactions between silver nanoparticles (AgNPs) and primary immune cells. Mass cytometry reveals the heterogeneous biodistribution of the positively charged polyethylenimine-coated AgNPs in various cell types and finds that monocytes and B cells have higher association with the AgNPs than other populations. scRNA-seq data of these two cell types demonstrate that each type has distinct responses to AgNP treatment: NRF2-mediated oxidative stress is confined to B cells, whereas monocytes show Fcγ-mediated phagocytosis. Besides the between-population heterogeneity, analysis of single-cell dose–response relationships further reveals within-population diversity for the B cells and naïve CD4+ T cells. Distinct subsets having different levels of cellular responses with respect to their cellular AgNP doses are found. This study demonstrates that the complementary use of mass cytometry and scRNA-seq is helpful for gaining in-depth knowledge on the heterogeneous interactions between immune cells and NPs and can be incorporated into future toxicity assessments of nanomaterials
Date & Time |
2021-07-07 14:00 ~ 14:30 |
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Place | 209 |
Speaker | Jinsoo Lee |
Affiliation | Korea Institute of Toxicology , KOREA |
Title | Developmental and reproductive toxicities of nanomaterials |
Lecture Summary
Nanomaterial development and research have precipitously increased recently, and engineered nano-related items are continuously introduced to the market. The use of nanomaterials extends to cosmetics, fabrics and clothing, personal care items, cleaning solutions, sporting equipment and electronics as well as toys for children; however, there are limited information of nanomaterials about the potential adverse effects in human health. In particular, potential adverse health effects of nanomaterials in developmental and reproductive function has been relatively less investigated in the nanotoxicology area. In this presentation, I will introduce the general overview of developmental and reproductive toxicities of nanomaterials and our toxicology study results with nanomaterials, including titanium dioxide, cerium oxide, zinc oxide, and silicon dioxide nanoparticles.
Date & Time |
2021-07-08 10:00 ~ 10:30 |
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Place | 209 |
Speaker | Eun-Jung Park |
Affiliation | Kyunghee University, KOREA |
Title | Silica nanoparticle-induced inflammatory response may be depended on types of cell death pathways |
Lecture Summary
In our previous study, we found that 20 nm-silica nanoparticles (SiNPs), but not 50 nm-SiNPs, induced an inflammatory response the lung of mice instilled repeatedly via the trachea for 90 days. To clarify the size-dependent response, we here compared the toxic mechanism of both sizes of SiNPs in vitro and in vivo. Cell viability decreased in cells exposed to both sizes of SiNPs compared with controls. The 20 nm- and 50 nm-SiNPs formed giant and autolysosome-like vacuoles in the cytosol, respectively, and structural damage of organelles, such as mitochondria, the endoplasmic reticulum (ER), lysosomes, and cell membranes, was more pronounced in cells exposed to 20 nm-SiNPs than in those exposed to 50 nm-SiNPs. While intracellular levels of reactive oxygen species were higher in cells exposed to both sizes of SiNPs compared with controls, intracellular calcium ions accumulated only in cells exposed to the smaller SiNPs. The total number of cells and the relative proportion of neutrophils were clearly elevated in the lungs of all mice exposed to 20 nm- and 50 nm-SiNPs compared with those in controls. Meanwhile, the levels of interleukin-6, macrophage inflammatory protein-1 alpha and monocyte chemoattractant protein-1 alpha significantly elevated only in the lungs of mice exposed to 20 nm-SiNPs. We also found that both sizes of SiNPs inhibited differentiation into M1 and M2 macrophages and decreased expression of adhesion molecules. Given that accumulation of giant vacuoles and dilation of the ER and mitochondria are key indicators of paraptosis, we suggest that 20 nm-SiNPs induce paraptosis-like cell death, leading to an inflammatory response.
Date & Time |
2021-07-08 10:30 ~ 11:00 |
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Place | 209 |
Speaker | Sanghun Kim |
Affiliation | Kyungsung University, KOREA |
Title | The Status of K-REACH on Nanomaterials |
Lecture Summary
EU REACH is the strictest law to govern the registration, evaluation, authorization and restriction of substances made available on the EU market. Although the scope of the REACH regulation doesn’t express the reference to nanomaterials, nanomaterials are covered by the definition of ‘substance’. It means only nanomaterials which have been registered according to REACH regulation can be manufactured and placed on the EU market. As of 1 January 2020, explicit legal requirements under REACH apply for companies that manufacture or import nanoforms after lengthy discussions. These reporting obligations address specific information requirements, outlined in revised annexes to the REACH regulation. It is very difficult to define nanomaterials, but nanomaterials are defined as the physical size, the shape and the volume specific surface areas under K-REACH on the aspect of regulation for chemical risk assessment, even though nanomaterials have diverse definitions scientifically. Under K-REACH nanomaterials, which is manufactured or imported over 1000 ton per year should be registered by 2024. But potential registrants are suffered to prepare registration dossier and physicochemical properties because of the lack of recognition on nanomaterials. The objectives of this presentation will show the current status of preparing nanomaterials registration as followings; First, the nomenclature and requirements for substance identification regarding nanomaterials will be compared under REACH and K-REACH. Second, the current status of manufacturing and importing of nanomaterials in Korea will be showed to register according to deadline of K-REACH. Third, the supporting activities by governmental level are introduced for K-REACH compliance to industries.
Date & Time |
2021-07-08 11:00 ~ 11:30 |
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Place | 209 |
Speaker | Jinyoung Jeong |
Affiliation | KRIBB, KOREA |
Title | Development of nanoplastics as reference materials and biosafety study using zebrafish embryos |
Lecture Summary
Plastic waste has been growing issue in environment and public health. There are various plastic depending on the chemical structure such as polyethylene (PE), polypropylene (PP), polystyrene (PS). Among them, PS nanoplastics were mainly used for risk assessment due to its commercial availability. However, PP is widely used plastics for packaging and mask and their risk assessment is rarely investigated due to the lack of reference materials. In this talk, I will present the synthetic methods of PP nano- and microplastics as reference materials and demonstrated their bioaccumulation study using zebrafish embryos. PP nanoplastics were prepared the modified non-solvent induced phase separation and fluorescently labeled by combined swelling-diffusion method. Their size was from hundreds nanometer to tens micrometer with spherical and fragmented shape. The red-fluorescent labeled nanoplastics were treated in zebrafish embroys for bioaccumulation study and found in mainly intestinal region of developing zebrafish with low mortality.
Date & Time |
2021-07-08 11:30 ~ 12:00 |
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Place | 209 |
Speaker | Sung Ik Yang |
Affiliation | Kyunghee University, KOREA |
Title | Assessment of Environmental Exposure of manufactured Nanomaterials in Korea |
Lecture Summary
Republic of Korea has established and promoted 「The Second Comprehensive Plan on Nano Safety Management (’17~’21)」at the governmental level in 2016, based on 「Mid-term plan for Nano Safety Management. In order to investigate the assessment of environmental exposure of nanomaterials in aqueous phase, we carried out following projects.
1. We have investigated the removal and release of NPs (TiO2 and ZnO) from field wastewater treatment plants
2. We have investigated the environmental monitoring of TiO2 NPs released from manufacturer.
3. We have monitored the environmental exposure of TiO2 and ZnO NPs released from cosmetic sunscreen in swimming pools.
Date & Time |
2021-07-08 13:00 ~ 13:30 |
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Place | Online |
Speaker | Flemming Cassee |
Affiliation | RIVM, Netherlands |
Title | Safe-by-design: lessons learned and tools to map the potential toxicity of nanomaterials |
Lecture Summary
As the world expects solutions for a multitude of technological challenges, not least in response to COVID-19, climate change or other future global crises, from increasingly more “clever” or “advanced” nanomaterials, the race is on to discover such novel substances. But how do we address
their safety and what have we learned from the last 15 years of nanosafety research? The early days saw a lot of uncertainty, as is often the case with emerging research fields. This impasse was broken when close collaboration between material scientists and (eco)toxicologists became an essential
feature of meaningful and reproducible laboratory studies. In this paper a number of lessons learned from nanosafety research will be presented that can be used when developing safe (and sustainable) by design strategies.
Date & Time |
2021-07-08 13:30 ~ 14:00 |
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Place | Online |
Speaker | Monique Groenewold |
Affiliation | RIVM, Netherlands |
Title | Effective Risk Governance of nanomaterials |
Lecture Summary
Innovation brings huge potential for economic growth, helps address societal and environmental challenges but also brings uncertainty. This signals a new interest for developing, producing and commercialising products based on or including nanomaterials in a way that strengthens safety, circularity and sustainability, now and in the future. Innovation is leading to a renewed development of nanotechnology, with promising outcome in many domains.
Safe and sustainable exploitation of nanomaterials requires effective risk governance. And yet, very important concerns remain about technical risk assessment, public acceptance and regulatory effectiveness among other aspects.
Risk governance is hampered by uncertainty about risks of (new) nanomaterials, limited cooperation between stakeholders, fragmented risk assessment and regulation, stakeholders lacking oversight of the risk governance landscape and disagreements on data quality and interpretation.
Improvements are needed in how risks to human health and the environment are addressed.
Three EU Horizon2020 Projects - Gov4Nano (meeting the needs of nanotechnology), RiskGONE (Science-based Risk Governance of Nano-Technology) and NANORIGO (Establishing a NANOtechnology RIsk GOvernance Framework)have joined forces to effectively improve risk governance of nanomaterials. In the context of scientific and societal considerations, the projects are collaborating closely to develop tools and a robust policy framework to better understand, assess and govern the risk of nanomaterials, and are therefore also working together to establish a Nano Risk Governance Council (NRGC).
The projects are half way and worked together to develop a possible design and role for a new organisation that would be tasked with governing risks from nano-based products (NRGC). In this presentation the latest developments with respect to development are presented such as the goals that the Council could aim to, and why, the activities and services it could offer. It has been developed in a co-creation approach with key stakeholders and represents the current view of how such a council could be organized. Elements of the council design will be tested coming period and the projects will further engage with key stakeholders in regulation, industry and NGOs to collect their feedback as possible members of the NRGC. This process will be used to refine the design of the NRGC prior to a possible launch in 2022.
Date & Time |
2021-07-08 14:00 ~ 14:30 |
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Place | Online |
Speaker | Wendel Wohlleben |
Affiliation | BASF, Germany |
Title | Advanced nanomaterials: Designed for functionality and safe use |
Lecture Summary
Next generation nanomaterials go beyond the well-known particle-based systems. The include surface structure and internal structures, formed by reactive processes in-situ or by advanced manufacturing techniques. Advanced materials enable novel functionalities, but nanotechnology is only one of several enabling technologies, as evidenced by the recent industry-academia report from the NanoMat network. Unusual and advanced materials are easier to introduce in the market with a safe innovation approach. Safe-and Sustainable-by-Design (“SSbD”) optimisation and assessment is key to make the predicted growth rates environmentally acceptable. As an example, the aerogel insulation market is very dynamic as well, predicted to reach $2.5billion by 2025. If the safe use at construction sites is demonstrated with SSbD tools, then the current niche applications (around $600million in 2018) can grow via multicomponent aerogel insulation structures that are expected to cover 30 million square meters in the EU by 2025, driven by rising awareness of green building materials.
The OECD and national agencies now discuss if certain classes of advanced materials pose specific safety concerns that require adapted testing methods, or potentially adapted regulation. In most cases in the EU, REACH or sector-specific regulations apply, but if not, the customer and consumers will inquire about the conditions safe use. Case studies exemplify innovative materials, and their SSbD development. The EU Green Deal will increase pressure to use SSbD concepts, and may incite industry to adapt this strategy also to polymers potentially releasing microplastics. This is even more relevant considering the already existing regulation of polymers under K-REACH, and the upcoming regulation of polymers in general and of primary microplastics specifically in several global regions, including the EU. Some of the concepts and case studies were supported by BMBF project InnoMat.Life (2019-2021), and a more comprehensive Safe-Innovation-Approach on multicomponent (nano)materials is being developed by H2020 HARMLESS (2021-2024).
Date & Time |
2021-07-08 14:45 ~ 15:15 |
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Place | Online |
Speaker | Eugenia (Eva) Valsami-Jones |
Affiliation | University of Birmingham, UK |
Title | Analytical innovation in nanomaterial characterization to address safety and functionality |
Lecture Summary
Nanomaterial characterization, whether performed to assess the functionality or safety of a substance, is, fundamentally, the same process and requires a common approach. To describe a nanomaterial fully several properties, beyond size and structure, need to be assessed, including, for example, toxicity. The EU Horizon 2020 project ACEnano[1] was conceived to address primarily nanosafety characterization concerns, specifically to introduce confidence, adaptability and clarity into nanomaterial risk assessment by developing a robust tiered approach to nanomaterials physicochemical characterization needs in a simple to adopt and follow way. ACEnano prioritised nanomaterial characterization in complex media and around difficult to measure properties (e.g. hydrophobicity) and also aimed to support industry, especially SMEs, in their need for a clear path to the characterization of their products, ultimately to fulfil legal obligations (REACH).
In my presentation, I will be discussing a range of analytical innovations and developments being carried out by the ACEnano consortium, including miniaturisation, hyphenation, harmonised sample introduction and characterization of complex samples (e.g. particles within cells) or in complex media. Data warehousing and an e-tool to guide characterization have also been developed in order to ensure continuity between datasets, the protocols used to collect them and the optimal characterization methodologies as part of advancing quality control criteria in nanosafety. The panoply of techniques researched within the project may also offer improved understanding of material functionality and address nanomaterials performance, with a view to guide future safe-by-design approaches.
References
1. ACEnano: http://www.acenano-project.eu/
Date & Time |
2021-07-08 15:15 ~ 15:45 |
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Place | Online |
Speaker | Theodore B. Henry |
Affiliation | Heriot-Watt University, UK |
Title | Sorption, bioavailability, and decomposition of toxicants associated with nanoparticles in the aqueous phase |
Lecture Summary
Aqueous-phase behavior of engineered nanoparticles (NPs) is influenced by NP physicochemistry and the biotic and abiotic characteristics of the water in which particles are dispersed. Individual NPs can aggregate tightly together or form larger particle agglomerates that present surfaces upon which sorption of dissolved substances can occur and upon which biofilms can form. Understanding the environmental implications of surface water contamination by NPs requires appreciation of the behavior of NPs in the aqueous phase including processes that influence NP fate and bioavailability, and the influence that NPs have on other substances including toxicants present in the water. This lecture will present results of our investigations on a variety of NPs [metal, metal oxide, and carbon (C60 and single-walled nanotubes)] and nanoplastics in the aqueous phase to clarify relationships between particle physicochemistry, sorption-desorption processes, and formation of decomposition products during these interactions. These investigations employ a variety of techniques to evaluate particle behavior, assess substance bioavailability (e.g., changes in biomarker gene expression and oxidation of biomolecules), and determine outcome of interactions between NPs and dissolved substances (metals and organic molecules) including co-exposure with ultraviolet light. We report that sorption of substances (e.g., dissolved metals) is influenced by NP surface charges and to some extent by substance hydrophobicity (e.g., Log10 Kow, organic substances such as polycyclic aromatic hydrocarbons). Sorbed substances can desorb and become bioavailable presenting concerns for toxicity but frequently do not. Photoactivation of some NPs (e.g., TiO2-NPs) can influence sorption of substances (e.g., PAHs) and induce formation of unexpected decomposition products with different biological activity. Surface waters contain numerous natural particles, including particles in the size range of NPs, and these natural particles are in continuous interactions with substances in the aqueous phase. Improved understanding of the interactions between aqueous-phase NPs and dissolved substances informs on the behavior of natural particles in surface waters and processes that influence sorption, bioavailability, and fate. These processes are critical to understanding toxicology of substances released into surface waters.
Date & Time |
2021-07-07 11:30 ~ 11:45 |
Place | 209 |
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Speaker | Soo-Jin Choi | Affiliation | Seoul Women’s University |
Title | Characterization and fate determination of silica nanoparticles in commercial foods and their cytotoxicity |
Date & Time |
2021-07-07 11:45 ~ 12:00 |
Place | 209 |
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Speaker | Hyun Kil Shin | Affiliation | Korea Institute of Toxicology |
Title | Nanosafety in artificial intelligence era: What have been done and what to be done? |
Date & Time |
2021-07-07 12:00 ~ 12:15 |
Place | 209 |
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Speaker | Sungbaek Seo | Affiliation | Pusan National University |
Title | Removal of microplastics via tannic acid-mediated coagulation and in vitro impact assessment |
From DFT to TCAD: Multiscale Approaches to Nano Device Modeling and Simulations
As the feature size of the transistors shinks to a few nanometers, the first principles based atomistic approach is called for in the modeling and simulations of the nanoscale electronic devices. This should be linked to the continuum-model based TCAD tools which are still the work-horse for the industry. The multiscale approaches bridging the various domains and disciples of density functional theory, tight-binding method, Boltzmann transport and drift-diffusion equations and so on are the main topic of this Session.
- Modeling and simulations of nanoscale devices
- Computational design and simulations of engineered nanomaterials and nanostructures
- Recent progress in the methodology for material/device modeling and simulations
- First principles modeling and simulations of nano materials and devices
- Quantum/Semiclassical/TCAD modeling and simulations of nanoscale electronic devices
- Simulations of electronic, thermal, optical and mechanical properties of nanostructures
- Multiscale and multiphysics approaches to device modeling and simulations
Date & Time |
2021-07-07 13:00 ~ 13:30 |
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Place | Online |
Speaker | Alexandre Rocha |
Affiliation | Universidade Estadual Paulista, BRAZIL |
Title | Atomistic Simulations of Biosensors: combining non-equilibrium Green’s functions and QM/MM methods |
Lecture Summary
Solvated systems apear in a number of applications, from electrochemistry to biosensors. From a theoretical point of view these are complex systems from a number of aspects. In particular the design of all electronic biosensors requires that the device be immersed in – a typically aqueous – solution that involves a large configurational space. Furthermore, biomolecules comprise large complex structures that are not always feasible with state of the art ab initio methods. In this talk I will address a methodology that strikes a balance. Known as QM/MM, we combine it with a non-equilibrium Green’s function formalism to simulate electronic transport in graphene, graphene nanopores and nanogaps as possible platforms for DNA chips, and de novo sequencing. I will address the effects of the solvent on the electronic transport properties of such devices, and how the potential of water molecules, and particularly of charged counter ions completely alter the properties compared to simulations in the “gas phase”.
Date & Time |
2021-07-08 14:00 ~ 14:30 |
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Place | 303 |
Speaker | Young Woo Son |
Affiliation | KIAS, KOREA |
Title | Fast and accurate first-principles computational methods for high-throughput materials researches |
Lecture Summary
For massive database-driven materials research, there are increasing demands for both fast and accurate quantum mechanical computational tools. Contemporary atomistic first-principles methods can be fast, sacrificing their accuracy, or be precise, consuming a significant amount of resources. Here, to overcome such a problem, we present a new first-principles computational method that exploits self-consistent determinations of the on-site and inter-site Hubbard interactions simultaneously and obtain band gaps of diverse materials in the accuracy of the GW method at a standard ab initio computational cost. We also obtain good agreements between computed and measured band gaps of low-dimensional systems, thus meriting this approach for large-scale as well as high-throughput calculations for various bulk and nanoscale materials with a higher accuracy.
Date & Time |
2021-07-08 14:30 ~ 15:00 |
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Place | 303 |
Speaker | Jun Hee Lee |
Affiliation | UNIST, KOREA |
Title | Ultimate-density ferroelectric memories from HfO2 via flat bands |
Lecture Summary
I will introduce you to our recent theory paper published in SCIENCE (“Scale-free ferroelectricity induced by flat phonon bands in HfO2”, Science 369, 1343 (2020)). Due to the collective nature of Gamma polar phonon, ferroelectricity has to weaken or disappear by strong scaling effects in a nano-scale. However, we discovered flat phonon bands from Gamma to zone-boundary exist in HfO2 and they produce ultimately-localized ferroelectric dipole moments. Due to the localized nature, the ferroelectric moments barely decrease all the way down to sub-nm scale. I will explain this striking theory and think of how to break the deleterious scaling effect by employing the flat bands in the commercial ferroelectric HfO2 for the design of ultimate-density ferroelectric memory up to ~500 Tb.
Date & Time |
2021-07-08 15:00 ~ 15:30 |
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Place | Online |
Speaker | David Esseni |
Affiliation | University of Udine, Italy |
Title | Ferroelectric based CMOS devices for energy efficient neuromorphic computing |
Lecture Summary
The slowing down of the CMOS geometrical scaling has steered the research in nanoelectronics to new functionalities for novel computational paradigms, with a great attention to energy efficiency. In particular there is a growing interest for memristors capable of multiple resistance levels, that may be used in crossbar arrays for artificial deep neural networks, as well as in hybrid memristive-CMOS circuits for neuromorphic computing.
Thanks to the field driven polarization switching, ferroelectrics are promising baseline materials for energy efficient memristors. Moreover, the discovery of ferroelectricity in hafnium oxides paved the way towards ferroelectric CMOS devices, that can be also implemented in the Back End Of Line CMOS fabrication steps so as to realize a 3D integration between the synaptic devices and the CMOS circuits. The technological exploitation of ferroelectric materials in CMOS integrated circuits offers new design opportunities, but also significant challenges from an integration, optimization and modelling perspective.
In this presentation we will revisit the work carried in our group and reported in the literature about some fundamental aspects of the ferroelectric switching and thus the operation of CMOS compatible ferroelectric devices. The challenges and opportunities in the design of these devices will be outlooked, with a particular attention to possible applications in neuromorphic computing.
Date & Time |
2021-07-09 10:00 ~ 10:30 |
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Place | 303 |
Speaker | Young Mi Cho |
Affiliation | Samsung Display, KOREA |
Title | Multi-scale simulation and AI for Display device |
Lecture Summary
Display applications have become diverse and materials, device architecture and process should be selected considering resolution and area.
In this presentation, we will introduce multi-scale simulation approach for oxide TFT, OLED, and Quantum-Dot and discuss the key factors to enhance efficiency and reliability incorporating process variables. Additionally, we will introduce machine-learning technology for discovering new materials of OLED.
Date & Time |
2021-07-09 10:30 ~ 11:00 |
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Place | Online |
Speaker | Satoshi Watanabe |
Affiliation | University of Tokyo, JAPAN |
Title | Dynamical behaviors of ions in solids studied via neural network interatomic potentials |
Lecture Summary
Recent development of novel information and energy devices urges us to deepen our understanding on ion dynamics in solids at atomic level. Though density functional theory (DFT) calculation is powerful for this purpose, it is often too heavy in the light of computations. Therefore, interatomic potentials optimized using DFT calculation data and machine-learning technique have attracted much attention recently. In this talk, we will present results of our recent studies on ion dynamics via the high-dimensional neural network potential (HDNNP) method. First, we discuss Li ion diffusion in amorphous Li3PO4. Besides good agreement with DFT calculations on the total energy, the HDNNP trained in a small supercell is successfully applied to calculations in much larger supercells. Moreover, the activation energy for Li diffusion evaluated from the molecular dynamics simulations with HDNNP agrees well with those evaluated from experiments. In addition, to examine the ion dynamics under electric fields, we have also constructed a neural network to predict Born effective charges. Second, we discuss phonon bands and thermal transport properties. We show that the HDNNPs can reproduce the phonon bands and thermal conductivities of Si and wurtzite GaN crystals calculated with DFT. We have also examined the effects of N vacancy on thermal conductivities of GaN.
Date & Time |
2021-07-07 13:30 ~ 13:45 |
Place | 303 |
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Speaker | Stefan Ringe | Affiliation | DGIST |
Title | Computational catalyst design at electrified solid-liquid interfaces |
Date & Time |
2021-07-07 13:45 ~ 14:00 |
Place | 303 |
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Speaker | Hafiz Ghulam Abbas | Affiliation | Daegu Gyeongbuk Institute of Science and Technology |
Title | Arsenic Carbide Allotropes Prediction: An Efficient Platform for Hole-Conductions, Optical and Photoelectrocatalysis Applications |
Date & Time |
2021-07-07 14:00 ~ 14:15 |
Place | 303 |
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Speaker | Heeyuen Koh | Affiliation | SNU |
Title | Twist-bend coupling of dsDNA on its wrapping of gold nanoparticle |
Date & Time |
2021-07-07 14:15 ~ 14:30 |
Place | 303 |
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Speaker | Bokyeom Kim | Affiliation | KAIST |
Title | Bayesian Optimization of 3-nm Node Nanosheet FETs |
Date & Time |
2021-07-08 15:30 ~ 15:45 |
Place | 303 |
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Speaker | Hyeongu Lee | Affiliation | Korea Advanced Institute of Science and Technology |
Title | Effects of the Temperature on the Performance of Doube-Gate Negative Capacitance Field-Effect Transistors |
Date & Time |
2021-07-08 15:45 ~ 16:00 |
Place | 303 |
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Speaker | Seonghyeok Jeon | Affiliation | KAIST |
Title | Comparative study of effective carrier approach and electron only approach: DFT based NEGF simulations |
Date & Time |
2021-07-09 11:00 ~ 11:15 |
Place | 303 |
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Speaker | Sungwoo Kang | Affiliation | Seoul National University |
Title | Fast prediction of crystal structure by machine-learning potential |
Date & Time |
2021-07-09 11:15 ~ 11:30 |
Place | 303 |
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Speaker | Seunghun Jang | Affiliation | Korea Research Institute of Chemical Technology (KRICT) |
Title | An Introduction to ChemAI: Platform for Data-Driven Materials Research |
Date & Time |
2021-07-09 11:30 ~ 11:45 |
Place | 303 |
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Speaker | Sung-Min Hong | Affiliation | GIST |
Title | Automated Extraction and Classification of Region Graphs for Semiconductor Device Structure Files |
NANO KOREA Symposium Committee