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103. Cover Image.

Author

Choi, Myungwoo, Lee, Geonhee, Lee, Yea‐Lee, Lee, Hyejeong, Yang, Jin‐Hoon, Jang, Hanhwi, Han, Hyeonseok, Kang, MinSoung, Yoo, Seonggwang, Jang, A‐Rang, Oh, Yong Suk, Park, Inkyu, Oh, Min‐Wook, Shin, Hosun, Jeon, Seokwoo, Lee, Jeong‐O, and Cho, Donghwi

Subjects
ENERGY harvesting
Abstract

This work features a thin, flexible thermoelectric membrane in a multifunctional wearable device, highlighting its advanced energy harvesting capabilities. [ABSTRACT FROM AUTHOR]

Published
2024
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104. Boosting bifunctional oxygen electrocatalysis of graphitic C3N4 using non-covalently functionalized non-oxidized graphene aerogels as catalyst supports.

Author

Kim, Jin, Tiwari, Anand P., Choi, Myungwoo, Chen, Qiang, Lee, Jinho, Novak, Travis G., Park, Minsu, Kim, Kisun, An, Ki-Seok, and Jeon, Seokwoo

Abstract

The doping state of graphene can regulate electron donation and acceptance with the supported active material during electrocatalytic reactions. Effectively doping graphene is thus crucial for inducing ideal electron transfer for the desired reaction. Functionalization of graphene with non-covalent adsorbents can accurately modulate its electronic state by providing an ideal doping configuration without damaging the basal plane. Herein, graphitic carbon-nitride (g-C3N4) is embedded on non-oxidized graphene aerogel (NOGA) with non-covalent adsorbents (polyvinylpyrrolidone for n-type and pyrenebutyric acid for p-type) to promote either the oxygen reduction or evolution reaction (ORR or OER). As a result, the embedded g-C3N4 showed catalytic performance comparable to those of noble metals, such as a low overpotential of 0.79 V vs. RHE on ORR activity, or 1.42 V vs. RHE at 10 mA cm−2 on the OER, and on n-type or p-type NOGA, respectively. This work may provide insights into the design of an effective conductive support for utilizing catalysts for multifunctional purposes. [ABSTRACT FROM AUTHOR]

Published
2022
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105. Flexible Protective Film: Ultrahard, Yet Flexible Hybrid Nanocomposite Reinforced by 3D Inorganic Nanoshell Structures

Author

Bae, Gwangmin, primary, Choi, Gwang‐Mun, additional, Ahn, Changui, additional, Kim, Sang‐Min, additional, Kim, Wonsik, additional, Choi, Youngjun, additional, Park, Dawon, additional, Jang, Dongchan, additional, Hong, Jung‐Wuk, additional, Han, Seung Min, additional, Bae, Byeong‐Soo, additional, and Jeon, Seokwoo, additional

Published
2021
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107. Light‐Activated Gas Sensors: Optically Activated 3D Thin‐Shell TiO 2 for Super‐Sensitive Chemoresistive Responses: Toward Visible Light Activation (Adv. Sci. 3/2021)

Author

Cho, Donghwi, primary, Suh, Jun Min, additional, Nam, Sang‐Hyeon, additional, Park, Seo Yun, additional, Park, Minsu, additional, Lee, Tae Hyung, additional, Choi, Kyoung Soon, additional, Lee, Jinho, additional, Ahn, Changui, additional, Jang, Ho Won, additional, Shim, Young‐Seok, additional, and Jeon, Seokwoo, additional

Published
2021
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113. Optically Activated 3D Thin‐Shell TiO 2 for Super‐Sensitive Chemoresistive Responses: Toward Visible Light Activation

Author

Cho, Donghwi, primary, Suh, Jun Min, additional, Nam, Sang‐Hyeon, additional, Park, Seo Yun, additional, Park, Minsu, additional, Lee, Tae Hyung, additional, Choi, Kyoung Soon, additional, Lee, Jinho, additional, Ahn, Changui, additional, Jang, Ho Won, additional, Shim, Young‐Seok, additional, and Jeon, Seokwoo, additional

Published
2020
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125. Contributors

Author

Hyunsu Cho, Nam Sung Cho, Yong Seok Choi, Won Kook Choi, Jun-Han Han, Amirhossein Hasani, Byung Hee Hong, Yoon Hyewon, Hong Hee Kim, Soo Young Kim, Sung-Joo Kwon, Byoung-Hwa Kwon, Tae-Woo Lee, Jeong-Ik Lee, Nan Liu, Park Minsu, Jaehyun Moon, Shuyan Qi, Wencai Ren, Jeon Seokwoo, Jin-Wook Shin, Quyet Van Le, and Je Min Yoo

Published
2020
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126. Graphene-based quantum dot emitters for light-emitting diodes

Author

Yoon Hyewon, Jeon Seokwoo, and Park Minsu

Subjects
Materials science, Photoluminescence, law, Graphene, Flexible display, Quantum dot, Nanotechnology, Light-emitting diode, law.invention
Abstract

In this chapter, we describe recent progresses on graphene quantum dots (GQDs) for light-emitting devices (LEDs). We start with a general definition of GQDs and provide the mechanism of intrinsic photoluminescence (PL) of GQDs, which is originated from confined sp2 carbon clusters, namely subdomain. Next, we introduce the various synthetic strategies of GQDs mainly by top-down and bottom-up approaches with the importance of oxidation control. The ways to realize highly efficient PL from GQDs are also discussed. With some important features of state-of-the-art GQD-based LED applications, a brief perspective is presented, aiming for the next-generation flexible displays.

Published
2020
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128. Human skin-inspired integrated multidimensional sensors based on highly anisotropic structures

Author

Chen, Haomin, Jing, Ying, Lee, Jeng-hun, Liu, Dan, Kim, Jungmo, Chen, Shusheng, Huang, Kan, Shen, Xi, Zheng, Qingbin, Yang, Jinglei, Jeon, Seokwoo, Kim, Jang Kyo, Chen, Haomin, Jing, Ying, Lee, Jeng-hun, Liu, Dan, Kim, Jungmo, Chen, Shusheng, Huang, Kan, Shen, Xi, Zheng, Qingbin, Yang, Jinglei, Jeon, Seokwoo, and Kim, Jang Kyo

Abstract

Stretchable sensors capable of detecting various mechanical stimuli are essential in wearable applications involving multiaxial motions. Previous wearable sensors are designed for sensing only single-axis deformation or multidimensional strains in a two-dimensional plane. Given the three-dimensional (3D) nature of multiaxial stimuli in practical applications, discriminating multidimensional strains in 3D space is critical and requires an integration of different anisotropic sensors for high sensitivity and selectivity. In this study, a skin-inspired multidimensional sensor capable of sensing 3D stimuli is developed by rationally integrating three sub-sensors, which simultaneously and selectively measure strains in three orthogonal axes. The 3D anisotropic sensing characteristics of the sub-sensors arising from their highly anisotropic structures enable the differentiation of 3D stimuli including in-plane tension, normal pressure and shear, and the distinction of in-plane strain directions with an unprecedented selectivity of 3.68 among existing stretchable sensors. With a remarkable gauge factor of 168 for in-plane strains and high sensitivity of 0.62 kPa−1 for normal pressure, the sensor is used in a smart sport assistant that can evaluate sport performance and provide feedback in real-time. The findings in this work provide a new anisotropic design of multidimensional sensors for emerging applications, such as smart electronics and humanoid robots.

Published
2020

129. Blue emission at atomically sharp 1D heterojunctions between graphene and h-BN

Author

National Research Foundation of Korea, Japan Society for the Promotion of Science, Ministry of Science, ICT and Future Planning (South Korea), European Commission, Generalitat de Catalunya, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Universidad Nacional Autónoma de México, Ministerio de Economía y Competitividad (España), Kim, Gwangwoo, Ma, Kyung Yeol, Park, Minsu, Kim, Minsu, Jeon, Jonghyuk, Song, Jinouk, Barrios Vargas, José Eduardo, Sato, Yuta, Lin, Yung-Chang, Suenaga, Kazu, Roche, Stephan, Yoo, Seunghyup, Sohn, Byeong-Hyeok, Jeon, Seokwoo, Shin, Hyeon Suk, National Research Foundation of Korea, Japan Society for the Promotion of Science, Ministry of Science, ICT and Future Planning (South Korea), European Commission, Generalitat de Catalunya, Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), Universidad Nacional Autónoma de México, Ministerio de Economía y Competitividad (España), Kim, Gwangwoo, Ma, Kyung Yeol, Park, Minsu, Kim, Minsu, Jeon, Jonghyuk, Song, Jinouk, Barrios Vargas, José Eduardo, Sato, Yuta, Lin, Yung-Chang, Suenaga, Kazu, Roche, Stephan, Yoo, Seunghyup, Sohn, Byeong-Hyeok, Jeon, Seokwoo, and Shin, Hyeon Suk

Abstract

Atomically sharp heterojunctions in lateral two-dimensional heterostructures can provide the narrowest one-dimensional functionalities driven by unusual interfacial electronic states. For instance, the highly controlled growth of patchworks of graphene and hexagonal boron nitride (h-BN) would be a potential platform to explore unknown electronic, thermal, spin or optoelectronic property. However, to date, the possible emergence of physical properties and functionalities monitored by the interfaces between metallic graphene and insulating h-BN remains largely unexplored. Here, we demonstrate a blue emitting atomic-resolved heterojunction between graphene and h-BN. Such emission is tentatively attributed to localized energy states formed at the disordered boundaries of h-BN and graphene. The weak blue emission at the heterojunctions in simple in-plane heterostructures of h-BN and graphene can be enhanced by increasing the density of the interface in graphene quantum dots array embedded in the h-BN monolayer. This work suggests that the narrowest, atomically resolved heterojunctions of in-plane two-dimensional heterostructures provides a future playground for optoelectronics.

Published
2020

131. Rational Design of All Resistive Multifunctional Sensors with Stimulus Discriminability.

Author

Lee, Jeng‐Hun, Kim, Eunyoung, Zhang, Heng, Chen, Haomin, Venkatesan, Harun, Chan, Kit‐Ying, Yang, Jie, Shen, Xi, Yang, Jinglei, Jeon, Seokwoo, and Kim, Jang‐Kyo

Subjects
STIMULUS & response (Psychology), DETECTORS, PRESSURE sensors, STRENGTH of materials
Abstract

A rational approach is proposed to design soft multifunctional sensors capable of detection and discrimination of different physical stimuli. Herein, a flexible multifunctional sensor concurrently detecting and distinguishing minute temperature and pressure stimuli in real time is developed using electrospun carbon nanofiber (CNF) films as the sole sensing material and electrical resistance as the only output signal. The stimuli sensitivity and discriminability are coordinated by tailoring the atomic‐ and device‐level structures of CNF films to deliver outstanding pressure and temperature sensitivities of −0.96 kPa−1 and −2.44% °C−1, respectively, enabling mutually exclusive sensing performance without signal cross‐interference. The CNF multifunctional sensor is considered the first of its kind to accomplish the stimulus discriminability using only the electrical resistance as the output signal, which is most convenient to monitor and process for device applications. As such, it has distinct advantages over other reported sensors in its simple, cost‐effective fabrication and readout system. It also possesses other invaluable traits, including good bending stability, fast response time, and long‐term durability. Importantly, the ability to simultaneously detect and decouple temperature and pressure stimuli is demonstrated through novel applications as a skin‐mountable device and a flexible game controller. [ABSTRACT FROM AUTHOR]

Published
2022
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132. Rationally Designed TiO2 Nanostructures of Continuous Pore Network for Fast‐Responding and Highly Sensitive Acetone Sensor.

Author

Suh, Jun Min, Cho, Donghwi, Lee, Sangmin, Lee, Tae Hyung, Jung, Jae‐Wook, Lee, Jinho, Cho, Sung Hwan, Eom, Tae Hoon, Hong, Jung‐Wuk, Shim, Young‐Seok, Jeon, Seokwoo, and Jang, Ho Won

Subjects
AIR quality monitoring, INDOOR air quality, NANOSTRUCTURES, GAS detectors, CHEMORECEPTORS, ACETONE, VOLATILE organic compounds
Abstract

For the last several years, indoor air quality monitoring has been a significant issue due to the increasing time portion of indoor human activities. Especially, the early detection of volatile organic compounds potentially harmful to the human body by the prolonged exposure is the primary concern for public human health, and such technology is imperatively desired. In this study, highly porous and periodic 3D TiO2 nanostructures are designed and studied for this concern. Specifically, extremely high gas molecule accessibility throughout the whole nanostructures and precisely controlled internecks of 3D TiO2 nanostructures can achieve an unprecedented gas response of 299 to 50 ppm CH3COCH3 with an extremely fast response time of less than 1s. The systematic approach to utilize the whole inner and outer surfaces of the gas sensing materials and periodically formed internecks to localize the current paths in this study can provide highly promising perspectives to advance the development of chemoresistive gas sensors using metal oxide nanostructures for the Internet of Everything application. [ABSTRACT FROM AUTHOR]

Published
2021
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136. Understanding the Origin of Ultrasharp Sub-bandgap Luminescence from Zero-Dimensional Inorganic Perovskite Cs4PbBr6

Author

Shin, Mingue, primary, Nam, Sung-Wook, additional, Sadhanala, Aditya, additional, Shivanna, Ravichandran, additional, Anaya, Miguel, additional, Jiménez-Solano, Alberto, additional, Yoon, Hyewon, additional, Jeon, Seokwoo, additional, Stranks, Samuel D., additional, Hoye, Robert L. Z., additional, and Shin, Byungha, additional

Published
2019
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137. Simultaneous Enhancement of Thermopower and Electrical Conductivity through Isovalent Substitution of Cerium in Bismuth Selenide Thermoelectric Materials

Author

Musah, Jamal-Deen, primary, Yanjun, Xiao, additional, Ilyas, A. M., additional, Novak, Travis G., additional, Jeon, Seokwoo, additional, Arava, Clement, additional, Novikov, S. V., additional, Nikulin, D. S., additional, Xu, Wei, additional, Liu, Liyao, additional, Md, Asaduzzaman, additional, Lam, Kwok-Ho, additional, Chen, Xianfeng, additional, Wu, Chi-Man Lawrence, additional, and Roy, Vellaisamy A. L., additional

Published
2019
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146. High-performance functional nanocomposites using 3D ordered and continuous nanostructures generated from proximity-field nanopatterning

Author

Ahn, Changui, primary, Park, Junyong, additional, Cho, Donghwi, additional, Hyun, Gayea, additional, Ham, Youngjin, additional, Kim, Kisun, additional, Nam, Sang-Hyeon, additional, Bae, Gwangmin, additional, Lee, Kisung, additional, Shim, Young-Seok, additional, Ang, Jade Nadine S, additional, and Jeon, Seokwoo, additional

Published
2019
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149. CO 2 Reduction: Continuous 3D Titanium Nitride Nanoshell Structure for Solar‐Driven Unbiased Biocatalytic CO 2 Reduction (Adv. Energy Mater. 25/2019)

Author

Kuk, Su Keun, primary, Ham, Youngjin, additional, Gopinath, Krishnasamy, additional, Boonmongkolras, Passarut, additional, Lee, Youngjun, additional, Lee, Yang Woo, additional, Kondaveeti, Sanath, additional, Ahn, Changui, additional, Shin, Byungha, additional, Lee, Jung‐Kul, additional, Jeon, Seokwoo, additional, and Park, Chan Beum, additional

Published
2019
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150. Precious‐Metal‐Free Electrocatalysts for Activation of Hydrogen Evolution with Nonmetallic Electron Donor: Chemical Composition Controllable Phosphorous Doped Vanadium Carbide MXene

Author

Yoon, Yeoheung, primary, Tiwari, Anand P., additional, Choi, Min, additional, Novak, Travis G., additional, Song, Wooseok, additional, Chang, Hyunju, additional, Zyung, Taehyoung, additional, Lee, Sun Sook, additional, Jeon, Seokwoo, additional, and An, Ki‐Seok, additional

Published
2019
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