Electrochemical scanning tunneling microscopy examination of the structures of benzenethiol molecules adsorbed on Au(100) and Pt(100) electrodes

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	Electrochemical scanning tunneling microscopy examination of the structures of benzenethiol molecules adsorbed on Au(100) and Pt(100) electrodes
	G. Z. Liu ; L. Y. O. Yang ; C. H. Shue ; H. I. Ma ; S. L. Yau ; S. H. Chen
刊名	Surface Science
	2007
卷号	601 期号:1 页码:247-254
关键词	scanning tunneling microscope adsorption benzenethiol Au(100) Pt(100) solid-liquid interface self-assembled monolayers au(111) adsorption surfaces butanethiol pt(111) gold reconstruction methanethiol transitions
ISSN号	0039-6028
中文摘要	In situ electrochemical scanning tunneling microscopy (STM) has been used to examine the structures of benzenethiol adlayers on Au(100) and Pt(100) electrodes in 0.1 M HClO4, revealing the formation of well-ordered adlattices of Au(100)-(root 2x root 5) between 0.2 and 0.9 V and Pt(100)-(root 2 x root 2)R45 degrees between 0 and 0.5 V (versus reversible hydrogen electrode), respectively. The coverage of Au(100)-(root 2 x root 5) is 0.33, which is identical to those observed for upright alkanethiol admolecules on Au(111). In comparison, the coverage of Pt(100)-(root 2 x root 2)R45 degrees - benzenethiol is 0.5, much higher than those of thiol molecules on gold surfaces. This result suggests that berizenethiol admolecules on Pt(100) could stand even more upright than those on Au(100). All benzenethiol admolecules were imaged by the STM as protrusions with equal corrugation heights, suggesting identical molecular registries on Au(100) and Pt(100) electrodes, respectively. Modulation of the potential of a benzenethiol-coated Au(100) electrode resulted in irreversible desorption of admolecules at E <= 0.1 V (vs. reversible hydrogen electrode) and oxidation of admolecules at E >= 0.9 V. In contrast, benzenethiol admolecule was not desorbed from Pt(100) at potentials its negative as the onset of hydrogen evolution. Raising the potential tendered deposition of more benzenethiol molecules before oxidation of admolecules commenced at E > 0.9 V. (c) 2006 Elsevier B.V. All rights reserved.
原文出处	://WOS:000243655000030
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/33702]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	G. Z. Liu,L. Y. O. Yang,C. H. Shue,et al. Electrochemical scanning tunneling microscopy examination of the structures of benzenethiol molecules adsorbed on Au(100) and Pt(100) electrodes[J]. Surface Science,2007,601(1):247-254.
APA	G. Z. Liu,L. Y. O. Yang,C. H. Shue,H. I. Ma,S. L. Yau,&S. H. Chen.(2007).Electrochemical scanning tunneling microscopy examination of the structures of benzenethiol molecules adsorbed on Au(100) and Pt(100) electrodes.Surface Science,601(1),247-254.
MLA	G. Z. Liu,et al."Electrochemical scanning tunneling microscopy examination of the structures of benzenethiol molecules adsorbed on Au(100) and Pt(100) electrodes".Surface Science 601.1(2007):247-254.