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- 저자 : 곽현태(H. T. Kwak) (검색결과 3 건)
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The Effects of Defect Sites on the Dissociation of NO on Pt(111) Surface
부진효(J. H. Boo),강용철(Y. C. Kang),송명철(M. C. Song),박종윤(C. Y. Park),곽현태(H. T. Kwak),이순보(S. B. Lee) 한국진공학회(ASCT) 1993 Applied Science and Convergence Technology Vol.2 No.4
열탈착 분광법과 Auger 전자분광법을 이용하여 Ar-이온에 스퍼터링된 Pt(111) 표면에 NO의 흡착이 연구되었다. Pt(111) 표면에 Ar-이온에 의해서 생성된 결함자리들은 NO의 해리를 촉진시켰으며 이러한 해리는 결함자리에 흡착되는 NO(β-상태)의 선구상태를 거쳐서 일어났다. 그리고 이들 상태에 흡착된 NO는 이전에 보고된 굽힘진동을 하는 화학종이라고 규정하였다. NO의 낮은 덮힘율에서는 흡착되는 NO의 대부분이 해리되며, 덮힘율이 증가함에 따라 해리되는 분율은 약 80%로 일정하였다. Adsorption of nitric oxide on the Pt(Ⅲ) surface sputtered by Ar-ion has been studied using thermal desorption spectroscopy and Auger electron spectroscopy. Ar-ion sputtering creates defect sites on the Pt(111) surface to promote dissociation of NO. Dissociation of NO occurs through a precursor state of NO (β state) adsorbed at defect sites. The precursor state is characterized by the terminal bent species. At low coverage most of adsorbed NO dissociates. And as increasing the coverage, the fraction of dissociation remains about 80%.
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AES-LEED 장치의 설계 및 제작과 Ni / Pt(111)계에 관한 연구
이순보(S. B. Lee),부진효(J. H. Boo),이성용(S. Y. Lee),박종윤(C. Y. Park),곽현태(H. T. Kwak) 한국진공학회(ASCT) 1993 Applied Science and Convergence Technology Vol.2 No.2
본 연구에서는 표면 분석 장비에 필요한 초고진공 용기를 설계 제작하였으며, LEED optics를 이용한 AES와 LEED 제어 장비를 설계하여 제작하였다. 제작된 일련의 장비들을 이용하여 LEED optics의 전자에너지 분해능을 측정하고, Pt(111) 표면에 증착된 Ni의 성장양식을 단분자층과 단분자층의 형성모델을 가정하여 증착된 Ni의 두께를 Auger signal의 비로부터 구하였다. Ultra High Vacuum chamber for surface analysis and a series of AES-LEED controllers for LEED optics was designed and constructed. Electron energy resolution of LEED optics was tested. On the basis of the layer by layer mode, thickness of evaporated Ni on Pt(111) was calculated from the Auger signal ratio.
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이경희,한현석,윤효근,부진효,이순보,곽현태 성균관대학교 기초과학연구소 1998 論文集 Vol.49 No.-
The coadsorption of CO and O₂ on W(110) surface was studied by LEED, TDS, and photoelectron spectroscopy. In the TDS for the coadsorption of CO at RT on O₂ precovered W(110) surface, two CO desorption states were observed at about 400 and 1150 K, called α and β , respectively. The β-CO spectra with second order desorption kinetics were shifted to lower desorption temperature as increasing the amount of preadsorbed atomic oxygen on the W(110). Moreover, the β-CO spectra were gradually increased with increasing the amount of preadsorbed oxygen to 0.5 ML. Even though a (2 x 1) LEED pattern appeared during oxygen adsorption at RT and 1-3 L oxygen exposures, we didn't observe any new pattern induced by CO in this study. Only the structure of c(11 x 5) was obtained at temperature in the range of 800-1100 K. These results indicated that there were interaction between CO and O and thereby the β-CO might riot be dissociated even at the higher temperature than 800 K. By using the XPS and UPS, it was also confirmed that the coadsorbed β-CO at 900 K doesn't dissociate as the experimental results of the adsorption of pure CO on W(110) surface at the same temperature. According to the valence band spectra, two CO peaks at near -10.7 eV (4σ) and -7.0 eV (5σ+1π) were observed, indicating molecular CO adsorption on the oxygen preadsorbed surface at RT. Even heating the coadsorbed surface to 900 K, we could also detect the CO 4σ peak which can be an important factor for identifying a contribution of the CO 4σ molecular orbital to the CO-metal bond. To our best knowledge, this is the first report and quite contradictory result to that reported previously.
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