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STM Study of 2-Mercaptoethanol Self-Assembled Monolayer on Au(111)
현문섭,이충균,Hyeon, Mun Seop,Lee, Chung Gyun Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.2
Presented are the STM images of self-assembled monolayer of 2-mercaptoethanol on Au(111). Striped structures of ($6{\times}3_{\frac{1}{2}}$), ($5{\times}3_{\frac{1}{2}}$), ($4{\times}3_{\frac{1}{2}}$) and compact-($5{\times}3_{\frac{1}{2}}$) were observed after annealing at $80^{\circ}C.$ Analysis of the ordered structures revealed that the basic fundamental units of the ordered structures were three crystallographically non-equivalent ($3_{\frac{1}{2}}{\times}3_{\frac{1}{2}}$) $R30^{\circ}$ assemblies, and that the way of combination of the assemblies produced the four different structures. The($6{\times}3_{\frac{1}{2}}$) structure ( $\theta$ = 0.33) was composed of one ($3_{\frac{1}{2}}{\times}3_{\frac{1}{2}}$)$R30^{\circ}$ assembly, while the ($5{\times}3_{\frac{1}{2}}$) ( $\theta$ = 0.30) and ($4{\times}3_{\frac{1}{2}}$) ( $\theta$ = 0.38) structures were consisted of two ($3_{\frac{1}{2}}{\times}3_{\frac{1}{2}}$) $R30^{\circ}$ assemblies, separated by 5a and 4a, respectively. Furthermore, the compact-(5X 3½) structure ( $\theta$ = 0.50) was obtained by overlapping three ($3_{\frac{1}{2}}{\times}3_{\frac{1}{2}}$) $R30^{\circ}$ assemblies. In spite of the diversity in the adsorption structures, all the adsorption sites of 2-mercaptoethanol were fundamentally identical. On the other hand, the unannealed primitive SAM of 2-mercaptoethanol was characterized by two observations: a short-range order keeping the adsorbed molecules at approximately $3_{\frac{1}{2}}$ a and the small domains of the striped structures supporting that the observed surface structures on the annealed surface were the extension of the primitive layer of 2-mercaptoethanol. Comparing these observations with the already published structures of ethanthiol, it was concluded that the interaction between the hydroxyl groups of 2-mercaptoethanol might play a significant role in the adsorption step of 2-mercaptoethanol on Au(111) to organize the adsorption structures different from those of ethanthiol.
일렉트론홀로그래피와 주사정전용량현미경 기술을 이용한 2차원 도펀트 프로파일의 측정
박경우 ( Kyoung Woo Park ),현문섭 ( Moon Seop Hyun ),유정호 ( Jung Ho Yoo ),양준모 ( Jun Mo Yang ),윤순길 ( Soon Gil Yoon ),Ulugbek Shaislamov 대한금속재료학회 ( 구 대한금속학회 ) 2009 대한금속·재료학회지 Vol.47 No.5
2-dimensional (2D) dopant profiling in semiconductor device was carried out by electron holography and scanning capacitance microscopy methods with the same multi-layered p-n junction sample. The dopant profiles obtained from two methods are in good agreement with each other. It demonstrates that reliability of dopant profile measurement can be increased through precise comparison of 2D profiles obtained from various techniques. (Received January 6, 2009)
전계방출 투과전자현미경 분석기술을 이용한 Cu 입자 표면산화층의 정밀평가
이태훈 ( Tae Hun Lee ),유정호 ( Jung Ho Yoo ),현문섭 ( Moon Seop Hyun ),양준모 ( Jun Mo Yang ),성미린 ( Mi Ryn Seong ),권진형 ( Jin Yeong Kwon ),이선영 ( Caroline Sung Yong Lee ),김정선 ( Jeong Sun Kim ),백경호 ( Kyeong Ho Baik 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.1
Nanosized surface structures of Cu powders were investigated at the atomic scale by field-emission transmission electron microscope techniques. The nanoscale surface oxide layer on the Cu powder was analyzed to be the CU2O phase by electron diffraction pattern and electron energy-loss spectroscopy. In addition, it was found from high-resolution transmission electron microscopy study that there are formed no surface oxide layers on the surface of alkanethiol coated Cu powders.