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356 results on '"Shim, Wooyoung"'

7. Revealing the Substrate Constraint Effect on the Thermodynamic Behaviour of the Pd–H through Capacitive‐Based Hydrogen‐Sorption Measurement

Author

Kim, Gwangmook, primary, Lee, Soomin, additional, Lee, Sang‐kil, additional, Yu, Han Jun, additional, Cho, Hunyoung, additional, Chung, Youngjun, additional, Park, Tae‐Eon, additional, Lee, Hyun‐Sook, additional, Shim, Wooyoung, additional, Lee, Kyu Hyoung, additional, Park, Jeong Young, additional, Kim, Yu Jin, additional, Chun, Dong Won, additional, and Lee, Wooyoung, additional

Published
2024
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8. Radio frequency cantilever-free scanning probe microscopy.

Author

Kim, Gwangmook, Cho, YoungJun, Cho, Min-Kyun, Kim, Dohun, and Shim, Wooyoung

Subjects
SCANNING probe microscopy, IMAGING systems, RADIO frequency, ATOMIC force microscopy, REFLECTOMETRY, OPTICAL time-domain reflectometry, CARBON composites
Abstract

Cantilever-free scanning probe microscopy has enormous potential for high-throughput topography imaging using parallel probe arrays. However, the current imaging mechanism of the cantilever-free tip architecture hardly considers the efficiency of the detection method regarding precision and bandwidth, which could be a bottleneck to expanding the application of this measurement system. In this communication, we present a contact resistance-based cantilever-free imaging system using radio frequency (RF) reflectometry. RF reflectometry measurements provide sensitive detection of the contact resistance with a wide bandwidth, enabling sub-micrometer-scale topography imaging. We demonstrated our imaging system using a carbon black-polydimethylsiloxane composite tip with a custom-built RF reflectometry setup. The proof-of-concept system achieved a resolution of 230 nm and a bandwidth of the detection system of approximately 8.5 MHz, validating the feasibility of the imaging technique for potential high-throughput cantilever-free scanning probe microscopy. [ABSTRACT FROM AUTHOR]

Published
2023
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11. Self‐Powered Sweat‐Responsive Structural Color Display.

Author

Kim, Taebin, Park, Tae Hyun, Lee, Jae Won, Lee, Dongwook, Mun, Seungsoo, Kim, Gwangmook, Kim, Yeonji, Kim, Gwanho, Park, Jong Woong, Lee, Kyuho, Lee, Seung Won, Jeon, Seungbae, Ryu, Du Yeol, Shim, Wooyoung, Kim, Jayoung, and Park, Cheolmin

Subjects
STRUCTURAL colors, PHOTONIC crystals, PERSPIRATION, ANIONS
Abstract

Despite the remarkable progress in the development of sweat sensors, self‐powered sweat‐responsive sensing displays that detect sweat in electric signals with simultaneous and direct visualization of the sweat is rarely demonstrated. Here, a self‐powered sweat‐responsive structural color (SC) display enabled by ionomer‐doped block copolymer (BCP) photonic crystals (PCs) is presented. The sweat‐responsive BCP PC is developed by employing a cross‐linking single‐mobile ionomer (SMI) with mobile anions anchored to immobile polycations to a 1‐D BCP PC. The hydrophobic SMI‐doped BCP PC is mechanically robust as well as water and temperature‐resistive, exhibiting ionomer concentration‐dependent full visible SCs. Moreover, the mobile anions periodically confined in the SMI‐doped BCP PC harvest triboelectric energy, giving rise to a high‐power density of ≈0.774 Mw cm−2. Cation‐sensitive SC variation is observed in the SMI‐doped BCP PC, allowing the visualization of sweat containing various cations. A skin‐patchable self‐powered sweat‐responsive display is demonstrated in which kirigami‐patterned SMI‐doped BCP PC incorporated in the display can withstand up to 50% strain during exercise. Sweat from the exercise is visualized via SC display and measured using both ionic resistance changes and triboelectric signals. In addition, the integration of sweat sensing membrane into SMI‐doped BCP PC enables the quantification of sweat. [ABSTRACT FROM AUTHOR]

Published
2024
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31. Extreme Ion Transport Inorganic 2D Membranes for Nanofluidic Applications

Author

Kim, Sungsoon, primary, Choi, Hong, additional, Kim, Bokyeong, additional, Lim, Geonwoo, additional, Kim, Taehoon, additional, Lee, Minwoo, additional, Ra, Hansol, additional, Yeom, Jihun, additional, Kim, Minjun, additional, Kim, Eohjin, additional, Hwang, Jiyoung, additional, Lee, Joo Sung, additional, and Shim, Wooyoung, additional

Published
2022
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36. Bulk Metamaterials Exhibiting Chemically Tunable Hyperbolic Responses

Author

Lee, Myeongjeong, primary, Lee, Eunsil, additional, So, Sunae, additional, Byun, Sejin, additional, Son, Jaeseok, additional, Ge, Bangzhi, additional, Lee, Hyungseok, additional, Park, Hyun Sung, additional, Shim, Wooyoung, additional, Pee, Jae Hwan, additional, Min, Bumki, additional, Cho, Sung-Pyo, additional, Shi, Zhongqi, additional, Noh, Tae Won, additional, Rho, Junsuk, additional, Kim, Jong-Young, additional, and Chung, In, additional

Published
2021
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41. Enhancing Li Ion Battery Performance by Mechanical Resonance

Author

Jin, Dana, primary, Kang, Hyeonsoo, additional, Do, Hyung Wan, additional, Kim, Gwangmook, additional, Kim, Taehoon, additional, Kim, Sungsoon, additional, Choi, Sangjin, additional, Won, Jongbum, additional, Park, Inchul, additional, Jung, Keeyoung, additional, and Shim, Wooyoung, additional

Published
2021
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42. Tandem Interactive Sensing Displays: Tandem Interactive Sensing Display De‐Convoluting Dynamic Pressure and Temperature (Adv. Funct. Mater. 23/2021)

Author

Jin, Wookyoung, primary, Kim, Eui Hyuk, additional, Lee, Seokyeong, additional, Yu, Seunggun, additional, Han, Hyowon, additional, Kim, Gwangmook, additional, Lee, Seung Won, additional, Jang, Jihye, additional, Lee, Chang Eun, additional, Shim, Wooyoung, additional, and Park, Cheolmin, additional

Published
2021
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43. Kinetic 2D Crystals via Topochemical Approach

Author

Bae, Jihong, primary, Kim, Minjung, additional, Kang, Hyeonsoo, additional, Kim, Taeyoung, additional, Choi, Hong, additional, Kim, Bokyeong, additional, Do, Hyung Wan, additional, and Shim, Wooyoung, additional

Published
2021
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46. Hard-tip, soft-spring lithography

Author

Shim, Wooyoung, Braunschweig, Adam B., Liao, Xing, Chai, Jinan, Lim, Jong Kuk, Gengfeng, Zheng, and Mirkin, Chad A.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Nanofabrication strategies are becoming increasingly expensive and equipment-intensive, and consequently less accessible to researchers. As an alternative, scanning probe lithography has become a popular means of preparing nanoscale structures, in part owing to its relatively low cost and high resolution, and a registration accuracy that exceeds most existing technologies (1-6). However, increasing the throughput of cantilever-based scanning probe systems while maintaining their resolution and registration advantages has from the outset been a significant challenge (7-17). Even with impressive recent advances in cantilever array design, such arrays tend to be highly specialized for a given application, expensive, and often difficult to implement. It is therefore difficult to imagine commercially viable production methods based on scanning probe systems that rely on conventional cantilevers. Here we describe a low-cost and scalable cantilever-free tip-based nanopatterning method that uses an array of hard silicon tips mounted onto an elastomeric backing. This method--which we term hard-tip, soft-spring lithography--overcomes the throughput problems of cantilever-based scanning probe systems and the resolution limits imposed by the use of elastomeric stamps and tips: it is capable of delivering materials or energy to a surface to create arbitrary patterns of features with sub-50-nm resolution over centimetre-scale areas. We argue that hard-tip, soft-spring lithography is a versatile nanolithography strategy that should be widely adopted by academic and industrial researchers for rapid prototyping applications., Molecular printing capabilities (1), where molecules and materials can be directly delivered to a surface in the form of nanometre-scale features, have been dramatically accelerated through the invention of micro-contact [...]

Published
2011
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48. Study of SiO2coating and carboxylic surface-modification on Mg-based inorganic fiber by one-step reflux reaction

Author

Park, Minsol, Choi, Areum, Kim, Seiki, Shim, Wooyoung, and Kim, YooJin

Abstract

Magnesium hydroxide sulfate hydrate (5 Mg(OH)2·MgSO4·3H2O abbreviated 513MHSH) whiskers using for fiber reinforcements and fillers are synthesized via a reflux reaction by using MgO and H2SO4as reactants. In general, the 513MHSH whiskers have hydrophilic surface and heat resistant property with crystal water molecules. In this work, surface modification and SiO2coating technique were employed for various application by coating with organic and silica layer on 513MHSH whisker surface. Also, SiO2coating system is important for preventing aggregation and enhancing thermal stability [J Kor Ceram Soc 55:618, 2018; J Nanosci Nanotechnol 10:380, 2010]. Controlling pH value acts as important factor for establish one-step process that synthesis and surface modification/SiO2coating process simultaneously to improve the efficiency in terms of the time and process. The morphology and phase of synthesized 513MHSH whiskers are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Surface modified whiskers were characterized by Fourier transform infrared spectroscopy (FTIR) and the thermal stability of SiO2coated whiskers were evaluated by thermogravimetric analysis (TGA).

Published
2022
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