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240 results on '"Seol, Min A."'

2. Elucidating the influence of residual polymer and gas environment on the electronic structure of a graphene layer using in situ APXPS

Author

Yun, Dong-Jin, Etxebarria, Ane, Lee, Kyung-Jae, Jung, Changhoon, Ko, Dong-Su, Seol, Min-Su, Kim, Hae-ryong, Jeon, Woo-Sung, Lee, Eunha, Chung, JaeGwan, and Crumlin, Ethan J

Subjects
Physical Sciences, Condensed Matter Physics, Graphene, Ambient pressure X-ray photoelectron spectroscopy, Ultraviolet photoelectron spectroscopy, Electronic structure, Work function, Applied Physics
Abstract

We use in situ ambient pressure X-ray photoelectron spectroscopy (APXPS) and ultraviolet photoelectron spectroscopy (UPS) to develop an effective method for studying changes in the graphene (Gr) electronic structure according to certain circumstance. The amount of polymethyl methacrylate (PMMA) residual polymer (RP), inevitably generated during the Gr transfer process, is significantly reduced from Gr surface by thermal annealing. This processed Gr is then sequentially exposed to specific gas environments (Ar, N2, O2, and CO2), and APXPS or UPS is carried out to investigate the variations in the Gr electronic structure including the work function. When the amount of PMMA RP on Gr is reduced, the position of the main carbon peak shifts by >0.4 eV to a higher binding energy (in XPS spectra), and the secondary electron cutoff moves by about 0.2 eV to a lower binding energy (in UPS spectra). These changes are generally caused by a decrease in the Gr work function. On the other hand, exposure to the gas environments at different temperatures that we investigated did not produce significant changes in the work function and chemical states of Gr. These results confirm that the material in contact with Gr should be considered to achieve the desired Gr performance in electronics.

Published
2020

4. A 1.1V 16Gb DDR5 DRAM with Probabilistic-Aggressor Tracking, Refresh-Management Functionality, Per-Row Hammer Tracking, a Multi-Step Precharge, and Core-Bias Modulation for Security and Reliability Enhancement.

Author

Woongrae Kim, Chulmoon Jung, Seong Nyuh Yoo, Duckhwa Hong, Jeongjin Hwang, Jungmin Yoon, Oh-Yong Jung, Joonwoo Choi, Sanga Hyun, Mankeun Kang, Sangho Lee, Dohong Kim, Sanghyun Ku, Donhyun Choi, Nogeun Joo, Sangwoo Yoon, Junseok Noh, Byeongyong Go, Cheolhoe Kim, Sunil Hwang, Mihyun Hwang, Seol-Min Yi, Hyungmin Kim, Sanghyuk Heo, Yeonsu Jang, Kyoungchul Jang, Shinho Chu, Yoonna Oh, Kwidong Kim, Junghyun Kim, Soohwan Kim, Jeongtae Hwang, Sangil Park, Junphyo Lee, In-Chul Jeong, Joohwan Cho, and Jonghwan Kim

Published
2023
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26. A 1.1V 16Gb DDR5 DRAM with Probabilistic-Aggressor Tracking, Refresh-Management Functionality, Per-Row Hammer Tracking, a Multi-Step Precharge, and Core-Bias Modulation for Security and Reliability Enhancement

Author

Kim, Woongrae, primary, Jung, Chulmoon, additional, Yoo, Seongnyuh, additional, Hong, Duckhwa, additional, Hwang, Jeongjin, additional, Yoon, Jungmin, additional, Jung, Ohyong, additional, Choi, Joonwoo, additional, Hyun, Sanga, additional, Kang, Mankeun, additional, Lee, Sangho, additional, Kim, Dohong, additional, Ku, Sanghyun, additional, Choi, Donhyun, additional, Joo, Nogeun, additional, Yoon, Sangwoo, additional, Noh, Junseok, additional, Go, Byeongyong, additional, Kim, Cheolhoe, additional, Hwang, Sunil, additional, Hwang, Mihyun, additional, Yi, Seol-Min, additional, Kim, Hyungmin, additional, Heo, Sanghyuk, additional, Jang, Yeonsu, additional, Jang, Kyoungchul, additional, Chu, Shinho, additional, Oh, Yoonna, additional, Kim, Kwidong, additional, Kim, Junghyun, additional, Kim, Soohwan, additional, Hwang, Jeongtae, additional, Park, Sangil, additional, Lee, Junphyo, additional, Jeong, Inchul, additional, Cho, Joohwan, additional, and Kim, Jonghwan, additional

Published
2023
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48. PEDOT:PSS/Polyacrylamide Nanoweb: Highly Reliable Soft Conductors with Swelling Resistance

Author

Gwang Mook Choi, Yoo-Yong Lee, Young-Joo Lee, Jeong-Yun Sun, Seung-Min Lim, Seol-Min Yi, and Young-Chang Joo

Subjects
Materials science, Polyacrylamide, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Microstructure, 01 natural sciences, 0104 chemical sciences, Polystyrene sulfonate, chemistry.chemical_compound, Hysteresis, PEDOT:PSS, chemistry, Nanofiber, General Materials Science, Deformation (engineering), Composite material, 0210 nano-technology, Electrical conductor
Abstract

According to the recent growth in interest of human-friendly devices, soft conductors, which are conductive materials with an inherent compliance, must have a low electrical strain sensitivity under large deformation conditions, environmental stability in water, and reliability even for complex and repeated deformation, as well as nontoxic characteristics. In this study, we fabricated a poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS)/polyacrylamide nanoweb that satisfies all of the above requirements through a web microstructure with entangled conductive nanofibers. Since the web structure can be deformed through structural alignment, the conductive path is stably maintained during deformation, which makes it highly conductive, electrically stable, and electrically strain insensitive. The tangled nanofibers are composed of PEDOT:PSS as a conductive component and polyacrylamide as a binding material, so it is nontoxic and has the soft properties of the material itself, which can withstand large deformations. Additionally, the material has a good electrical stability against repeated deformation so that the resistance increased by only 13% after a 50% strain was repeated 1000 times. Notably, electrical instabilities such as noise and hysteresis were not evident during the repeated deformations. Finally, the nanoweb has excellent swelling resistance and maintains its mechanical and electrical characteristics in water.

Published
2019

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