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In situ thickness control of black phosphorus field-effect transistors via ozone treatment

Nano Research 2016年第10期9卷 3056-3065页

作者： Suhyun Kim younghun jung Jong-Young Lee Gwan-Hyoung Lee Jihyun Kim Department of Chemical and Biological Engineering Korea University Seou102841 Republic of Korea Department of Materials Science and Engineering Yonsei University Seou103722 Republic of Korea

A simple and reproducible method to control the thickness of black phosphorus flakes in real time using a UV/ozone treatment is demonstrated. Back-gated black phosphorus field-effect transistors （FETs） were fabricated using thick black phosphorus flakes obtained by thinning of black phosphorus, as oxygen radicals generated by UV irradiation formed phosphorus oxides on the surface. In order to monitor the thickness effect on the electrical properties, the fabricated FETs were loaded in the UV/ozone chamber, where both the optical （micro-Raman spectroscopy and optical microscopy） and electrical properties （current-voltage characteristics） were monitored in situ. We observed an intensity decrease of the Raman modes of black phosphorus while the field-effect mobility and on/off ratio increased by 48% and 6,800%, respectively. The instability in ambient air limits the investigation and implementation of ultra-thin black phosphorus. However, the method reported in this study allowed us to start with thick black phosphorous flakes, providing a reliable approach for optimizing the electrical performance of black phosphorus-based electronic devices. We believe that these results can motivate further studies using mono- and few-layer black phosphorus.

关键词： black phosphorus in situ thinning UV/ozone treatment

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Osteoblasts dictate B lymphocyte commitment and differentiation

Osteoblasts dictate B lymphocyte commitment and differentiat...

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中国遗传学会“发育、遗传和疾病”研讨会

作者： younghun jung Nacksung Kim Gerard J.Joe Russell Taichman Stephen G.Emerson Department of Periodontics Prevention & Geriatrics University of Michigan School of Dentistry Ann Arbor MI 48109-1078. Abramson Cancer Center University of Pennsylvania School of Medicine Philadelphia PA 19104 Departments of Medicine and Pediatrics University of Pennsylvania School of Medicine Philadelphia PA 19104 Department of Periodontics Prevention & Geriatrics University of Michigan School of Dentistry Ann Arbor MI 48109-1078. Departments of Medicine and Pediatrics and Abramson Cancer Center University of Pennsylvania School of Medicine Philadelphia PA 19104.

It has long been hypothesized that early B lymphopoiesis in mammals is induced within the bone marrow(BM)microenvironment,but which cells specifically constitute this B cell niche is not known. Previous studies identified the osteoblast as an essential component of the BM niche for hematopoietic stem cells(HSCs)1,*** we show that selective depletion of endosteal osteoblasts in Col2.3Δ-TK transgenic mice leads to the acute loss of pre-pro-B and pro-B cells from BM,preceding a decline in HSCs. Conversely,purified osteoblasts support the differentiation of early B cell precursors from Lin-Sca-1+ primitive BM cells in vitro,inducing their development into IgM+ immature B ***-induced B lymphopoiesis is mediated via VCAM-1,SDF-1 and IL-7 signaling,which is stimulated by administration of parathyroid hormone(PTH).Thus,osteoblasts are necessary and sufficient for murine B cell commitment and maturation,and thereby constitute the cellular homologue of the avian Bursa of Fabricious.

关键词： Osteoblasts dictate B lymphocyte commitment and differentiation

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E2E-BPF microscope:extended depth-of-field microscopy using learning-based implementation of binary phase filter and image deconvolution

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Light(Science & Applications) 2023年第12期12卷 2610-2623页

作者： Baekcheon Seong Woovin Kim younghun Kim Kyung-A Hyun Hyo-Il jung Jong-Seok Lee Jeonghoon Yoo Chulmin Joo Department of Mechanical Engineering Yonsei UniversitySeoul 03722Republic of Korea The DABOM Inc Seoul 03722Republic of Korea School of Integrated Technology Yonsei UniversityIncheon 21983Republic of Korea

Several image-based biomedical diagnoses require high-resolution imaging capabilities at large spatial ***,conventional microscopes exhibit an inherent trade-off between depth-of-field(DoF)and spatial resolution,and thus require objects to be refocused at each lateral location,which is time ***,we present a computational imaging platform,termed E2E-BPF microscope,which enables large-area,high-resolution imaging of large-scale objects without serial *** method involves a physics-incorporated,deep-learned design of binary phase filter(BPF)and jointly optimized deconvolution neural network,which altogether produces high-resolution,high-contrast images over extended depth *** demonstrate the method through numerical simulations and experiments with fluorescently labeled beads,cells and tissue section,and present high-resolution imaging capability over a 15.5-fold larger DoF than the conventional *** method provides highly effective and scalable strategy for DoF-extended optical imaging system,and is expected to find numerous applications in rapid image-based diagnosis,optical vision,and metrology.

关键词： image diagnosis binary

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紫外线/臭氧处理对喷墨印刷铜图文和聚酰亚胺基材间相互作用的影响

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中国印刷与包装研究 2013年第1期5卷 71-75页

作者： LEE Young-In GOO Yong-Sung LEE Kun-Jae HWANG Yun-Gu BYUN younghun PARK Hee jung PARK Deok-Yong MYUNG Nosang V CHOA Yong-Ho 何文 Department of Fine Chemical Engineering Hanyang University Ansan 426 -791 Republic of Korea Advanced MaterialsLaboratory Samsung Advanced Institute of Technology Yongin 446-712 Republic of Korea Materials Research Laboratory AdvancedInstitute of Technology Yongin 446 - 712 Republic of Korea Department of Applied Materials Engineering Hanbat National University Daejeon 305 -719 Republic of Korea Department of Chemical and Environmental Engineering and Center forNanoscale Science and Engineering Univcrsity of California-Riverside Riverside CA 92521 USA 不详

摘译近年来,喷墨印刷电子技术得到了迅速发展,因为相对于传统光刻技术需要通过真空处理、化学沉积和蚀刻来制作电路图案,喷墨印刷更简单、经济。目前,喷墨印刷已用于制作各种灵巧的电子器件,如薄膜晶体管、射频识别标签、印刷电路板等。

关键词：喷墨印刷相互作用聚酰亚胺紫外线印刷电路板基材图文臭氧

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