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3. Mechano-thermo-chromic device with supersaturated salt hydrate crystal phase change.

Author

Cho, Hyunmin, Kwon, Jinhyeong, Ha, Inho, Jung, Jinwook, Rho, Yoonsoo, Lee, Habeom, Han, Seungyong, Hong, Sukjoon, Grigoropoulos, Costas P, and Ko, Seung Hwan

Abstract

Active control of transparency/color is the key to many functional optoelectric devices. Applying an electric field to an electrochromic or liquid crystal material is the typical approach for optical property control. In contrast to the conventional electrochromic method, we developed a new concept of smart glass using new driving mechanisms (based on mechanical stimulus and thermal energy) to control optical properties. This mechano-thermo-chromic smart glass device with an integrated transparent microheater uses a sodium acetate solution, which shows a unique marked optical property change under mechanical impact (mechanochromic) and heat (thermochromic). Such mechano-thermo-chromic devices may provide a useful approach in future smart window applications that could be operated by external environment conditions.

Published
2019

12. Reconfigurable Multilevel Optical PUF by Spatiotemporally Programmed Crystallization of Supersaturated Solution

Author

Kim, Youngchan, primary, Lim, Jaemook, additional, Lim, Ji Hwan, additional, Hwang, Eunseung, additional, Lee, Hyunkoo, additional, Kim, Minwoo, additional, Ha, Inho, additional, Cho, Hyunmin, additional, Kwon, Jinhyeong, additional, Oh, Junho, additional, Ko, Seung Hwan, additional, Pan, Heng, additional, and Hong, Sukjoon, additional

Published
2023
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14. Optical Intensity Predistortion for Inter-Dimensional Interference Mitigation in Multidimensional QAM-PIRFSK-MDPSK Optical Access Transmission

Author

Lee, Joungmoon, Ha, Inho, Park, Jinwoo, and Han, Sang-Kook

Abstract

We propose a novel predistortion technique for multidimensional quadrature amplitude modulation and polarized intensity rotational frequency shift keying based on M-ary differential phase shift keying (QAM-PIRFSK-MDPSK) optical modulation with a direct detection system. While the QAM-PIRFSK-MDPSK optical modulation is one of the most spectral efficient modulation techniques, inter-dimensional interference (IDI) limits the modulation order so that it is difficult to further increase the spectral efficiency. Therefore, it is very important to mitigate the IDI. Because most of the IDI in QAM-PIRFSK-MDPSK is caused by the intensity fluctuation due to the quadrature component of QAM, the quadrature component of QAM is suppressed by the bipolar non-return-to-zero signal addition. We verified the performance enhancement with the symbol error rate curve through simulations and experiments. With the proposed technique, a significant improvement in signal-to-noise ratio gain in QAM-PIRFSK-MDPSK was experimentally demonstrated.

Published
2023
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21. Digital selective transformation and patterning of highly conductive hydrogel bioelectronics by laser-induced phase separation

Author

Won, Daeyeon, primary, Kim, Jin, additional, Choi, Joonhwa, additional, Kim, HyeongJun, additional, Han, Seonggeun, additional, Ha, Inho, additional, Bang, Junhyuk, additional, Kim, Kyun Kyu, additional, Lee, Youngseok, additional, Kim, Taek-Soo, additional, Park, Jae-Hak, additional, Kim, C-Yoon, additional, and Ko, Seung Hwan, additional

Published
2022
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24. Transparent Air Filters with Active Thermal Sterilization

Author

Han, Seonggeun, primary, Kim, Jaewon, additional, Lee, Youngseok, additional, Bang, Junhyuk, additional, Kim, Cheol Gyun, additional, Choi, Junhwa, additional, Min, Jinki, additional, Ha, Inho, additional, Yoon, Yeosang, additional, Yun, Cheol-Heui, additional, Cruz, Mutya, additional, Wiley, Benjamin J., additional, and Ko, Seung Hwan, additional

Published
2021
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31. Artificial Thermal Sensation: Stretchable Skin‐Like Cooling/Heating Device for Reconstruction of Artificial Thermal Sensation in Virtual Reality (Adv. Funct. Mater. 29/2020)

Author

Lee, Jinwoo, primary, Sul, Heayoun, additional, Lee, Wonha, additional, Pyun, Kyung Rok, additional, Ha, Inho, additional, Kim, Dongkwan, additional, Park, Hyojoon, additional, Eom, Hyeonjin, additional, Yoon, Yeosang, additional, Jung, Jinwook, additional, Lee, Dongjun, additional, and Ko, Seung Hwan, additional

Published
2020
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34. Highly stretchable and oxidation-resistive Cu nanowire heater for replication of the feeling of heat in a virtual world

Author

Kim, Dongkwan, primary, Bang, Junhyuk, additional, Lee, Wonha, additional, Ha, Inho, additional, Lee, Jinwoo, additional, Eom, Hyeonjin, additional, Kim, Myungsin, additional, Park, Jungjae, additional, Choi, Joonhwa, additional, Kwon, Jinhyung, additional, Han, Seungyong, additional, Park, Hyojoon, additional, Lee, Dongjun, additional, and Ko, Seung Hwan, additional

Published
2020
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36. Directional Shape Morphing Transparent Walking Soft Robot

Author

Lee, Habeom, primary, Kim, Hyeonseok, additional, Ha, Inho, additional, Jung, Jinwook, additional, Won, Phillip, additional, Cho, Hyunmin, additional, Yeo, Junyeob, additional, Hong, Sukjoon, additional, Han, Seungyong, additional, Kwon, Jinhyeong, additional, Cho, Kyu-Jin, additional, and Ko, Seung Hwan, additional

Published
2019
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41. Transparent Air Filters with Active Thermal Sterilization

Author

Han, Seonggeun, Kim, Jaewon, Lee, Youngseok, Bang, Junhyuk, Kim, Cheol Gyun, Choi, Junhwa, Min, Jinki, Ha, Inho, Yoon, Yeosang, Yun, Cheol-Heui, Cruz, Mutya, Wiley, Benjamin J., and Ko, Seung Hwan

Abstract

The worldwide proliferation of COVID-19 poses the urgent need for sterilizable and transparent air filters to inhibit virus transmission while retaining ease of communication. Here, we introduce copper nanowires to fabricate transparent and self-sterilizable air filters. Copper nanowire air filter (CNAF) allowed visible light penetration, thereby can exhibit facial expressions, helpful for better communication. CNAF effectively captured particulate matter (PM) by mechanical and electrostatic filtration mechanisms. The temperature of CNAF could be controlled by Joule-heating up to 100 °C with thermal stability. CNAF successfully inhibited the growth of E. colibecause of the oligodynamic effect of copper. With heat sterilization, the antibacterial efficiency against G. anodireducenswas greatly improved up to 99.3% within 10 min. CNAF showed high reusability with stable filtration efficiency and thermal antibacterial efficacy after five repeated uses. Our result suggests an alternative form of active antimicrobial air filter in preparation for the current and future pandemic situations.

Published
2022
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43. Color-Changing Soft Actuators: Biomimetic Color Changing Anisotropic Soft Actuators with Integrated Metal Nanowire Percolation Network Transparent Heaters for Soft Robotics (Adv. Funct. Mater. 32/2018)

Author

Kim, Hyeonseok, primary, Lee, Habeom, additional, Ha, Inho, additional, Jung, Jinwook, additional, Won, Phillip, additional, Cho, Hyunmin, additional, Yeo, Junyeob, additional, Hong, Sukjoon, additional, Han, Seungyong, additional, Kwon, Jinhyeong, additional, Cho, Kyu-Jin, additional, and Ko, Seung Hwan, additional

Published
2018
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44. Biomimetic Color Changing Anisotropic Soft Actuators with Integrated Metal Nanowire Percolation Network Transparent Heaters for Soft Robotics

Author

Kim, Hyeonseok, primary, Lee, Habeom, additional, Ha, Inho, additional, Jung, Jinwook, additional, Won, Phillip, additional, Cho, Hyunmin, additional, Yeo, Junyeob, additional, Hong, Sukjoon, additional, Han, Seungyong, additional, Kwon, Jinhyeong, additional, Cho, Kyu‐Jin, additional, and Ko, Seung Hwan, additional

Published
2018
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50. Stretchable and Transparent Kirigami Conductor of Nanowire Percolation Network for Electronic Skin Applications

Author

Won, Phillip, Park, Jung Jae, Lee, Taemin, Ha, Inho, Han, Seonggeun, Choi, Mansoo, Lee, Jinhwan, Hong, Sukjoon, Cho, Kyu-Jin, and Ko, Seung Hwan

Abstract

Recent research progress of relieving discomfort between electronics and human body involves serpentine designs, ultrathin films, and extraordinary properties of nanomaterials. However, these strategies addressed thus far each face own limitation for achieving desired form of electronic-skin applications. Evenly matched mechanical properties anywhere on the body and imperceptibility of electronics are two essentially required characteristics for future electronic-skin (E-skin) devices. Yet accomplishing these two main properties simultaneously is still very challenging. Hence, we propose a novel fabrication method to introduce kirigami approach to pattern a highly conductive and transparent electrode into diverse shapes of stretchable electronics with multivariable configurability for E-skin applications. These kirigami engineered patterns impart tunable elasticity to the electrodes, which can be designed to intentionally limit strain or grant ultrastretchability depending on applications over the range of 0 to over 400% tensile strain with strain-invariant electrical property and show excellent strain reversibility even after 10 000 cycles stretching while exhibiting high optical transparency (>80%). The versatility of this work is demonstrated by ultrastretchable transparent kirigami heater for personal thermal management and conformal transparent kirigami electrophysiology sensor for continuous health monitoring of human body conditions. Finally, by integrating E-skin sensors with quadrotor drones, we have successfully demonstrated human-machine-interface using our stretchable transparent kirigami electrodes.

Published
2024
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