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2,147 results on '"Park, Jun Young"'

151. A missense variant in SHARPIN mediates Alzheimer’s disease-specific brain damages

Author

Park, Jun Young, Lee, Dongsoo, Lee, Jang Jae, Gim, Jungsoo, Gunasekaran, Tamil Iniyan, Choi, Kyu Yeong, Kang, Sarang, Do, Ah Ra, Jo, Jinyeon, Park, Juhong, Park, Kyungtaek, Li, Donghe, Lee, Sanghun, Kim, Hoowon, Dhanasingh, Immanuel, Ghosh, Suparna, Keum, Seula, Choi, Jee Hye, Song, Gyun Jee, Sael, Lee, Rhee, Sangmyung, Lovestone, Simon, Kim, Eunae, Moon, Seung Hwan, Kim, Byeong C., Kim, SangYun, Saykin, Andrew J., Nho, Kwangsik, Lee, Sung Haeng, Farrer, Lindsay A., Jun, Gyungah R., Won, Sungho, and Lee, Kun Ho

Published
2021
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161. High‐Performance Self‐Powered Deep Ultraviolet Photodetector Based on NiO/β‐Ga2O3 Heterojunction with High Responsivity and Selectivity.

Author

Woo, Sola, Lee, Taeeun, Song, Chang Woo, Park, Jun Young, Jung, Yusup, Hong, Jeongsoo, and Kyoung, Sinsu

Subjects
CARRIER density, METALLIC films, PHOTODETECTORS, ENERGY bands, HETEROJUNCTIONS
Abstract

A high‐performance self‐powered deep ultraviolet (DUV) photodetector based on the NiO/β‐Ga2O3 heterojunction is fabricated and analyzed. The NiO/β‐Ga2O3 heterojunction photodetectors are fabricated both with and without a post‐annealing process following NiO film deposition. Each photodetector structure is investigated through technology computer‐aided design simulations, including energy band diagram, trap density, and carrier concentration. The pristine self‐powered NiO/β‐Ga2O3 photodetector, lacking a post‐annealing process, exhibits partial Schottky contact formation between metal and NiO film, leading to performance degradation, including reduced responsivity, detectivity, and response time. On the other hand, the post‐annealed self‐powered NiO/β‐Ga2O3 photodetector demonstrates high performance such as a responsivity of 592.0 mA W−1, a detectivity of 4.30 × 1012 Jones, and response times of 30.93 ms and 72.32 ms, respectively. Therefore, the fabricated NiO/β‐Ga2O3 photodetector shows a promising potential for various applications requiring DUV detection without an external voltage bias. [ABSTRACT FROM AUTHOR]

Published
2024
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162. 2-Mercaptoethanesulfonic Acid as an Effective Free-Radical Scavenger in Perfluorosulfonic Acid Membrane-Based Polymer Electrolyte Membrane Fuel Cells.

Author

Barik, Bapun, Singh, Bhupendra, Namgung, Yeon, Islam, Md Shoriful, Han, Mi-Kyung, Park, Jun-Young, and Song, Sun-Ju

Subjects
PROTON exchange membrane fuel cells, COMPOSITE membranes (Chemistry), CERIUM oxides, PROTON conductivity, SOLID state proton conductors
Abstract

Ceria nanoparticle-based free-radical scavengers for the mitigation of oxidative damage in perfluorosulfonic acid (PFSA)-based polymer electrolyte membrane fuel cells (PEMFCs) suffer from the drawbacks of lowered protonic conductivity and leaching in the acidic environment of a PEMFC. As an alternative to ceria, here we demonstrate that oxidative damage can be mitigated by functionalization of Nafion with 2-Mercaptoethanesulfonic acid (MESA) in different (0.1–1.0 wt%) ratio. The spectroscopic investigation indicated successful functionalization of MESA over the Nafion chain and resulting Nafion-MESA composite membranes displayed improved hydration and swelling behavior, and thermal and mechanical properties. At ≤60 °C (95% relative humidity), the protonic conductivity of composite membranes was higher than/equivalent to that of pristine Nafion membrane; however, at ≥70 °C it was ∼6%–8% lower. At 80 °C, conductivity of Nafion-MESA-0.1 wt%, Nafion-MESA-0.25 wt%, pristine Nafion, and state-of-the-art Nafion-CeO2−1wt% membranes were 1.72 × 10−1, 1.67 × 10−1, 1.8 × 10−1, and 1.6 × 10−1 S∙cm−1, respectively. The fluoride emission rate value for the same membranes were 0.30, 0.17, 1.39, and 0.27 mg∙g−1, respectively, thus indicating that Nafion-MESA membranes can substitute the ceria-based membranes as a chemically stable membrane electrolyte in PEMFCs. [ABSTRACT FROM AUTHOR]

Published
2024
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