Potential-induced adsorption behavior of carboxyl-terminated alkanethiol on Au(111) surfaces

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題名:	Potential-induced adsorption behavior of carboxyl-terminated alkanethiol on Au(111) surfaces
作者:	姚學麟;Liu, Yung-Fang;Chen, Liang-Huei;Yoshimura, Masahiro;Yau, Shueh-Lin;Lee, Yuh-Lang
貢獻者:	理學院化學學系
日期:	2014-01-16
上傳時間:	2026-04-21 14:23:39 (UTC+8)
出版者:	American Chemical Society
摘要:	摘要： The adsorption and self-assembly behaviors of a carboxyl-group-terminated alkanethiol, 11-mercaptoundecanoic acid (MUA), on Au(111) electrodes in an electrochemical system are studied using in situ scanning tunneling microscopy. The effect of applied potential on the phase evolution of the MUA adlayer is investigated and compared with those reported for alkanethiols with various terminal groups. The results show that the MUA molecules initially adsorb in a lie-down orientation, organizing into ordered domains with a stripe structure. With further adsorption of MUA molecules, the alkyl chains lift off from the substrate, forming a more condensed phase with an arrangement of (√3 × √3). This phase evolution is similar to those reported for other alkanethiols. However, the adsorption process of MUA is much slower and a disordered transition phase (γ phase) exists between the stripe and saturation phases. The γ phase converts back to the stripe phase when the electrode potential is shifted from 0.2 to 0.4 V, following which the phase evolution cannot proceed further to the saturation phase. These results are contrary to those observed for other alkanethiols and are attributed to the interaction of the terminal −COOH group with the substrate at positive potentials. Under the electrode potential, the molecules bind to the substrate via both head and end groups, triggering a lie-down orientation and decreasing the mobility of adsorbed molecules. As a result, the adlayer remains in the stripe phase and further phase evolution is inhibited. 其他題名： J. Phys. Chem. C 出版者： American Chemical Society 出版日期： 2014-01-16 出處： Journal of physical chemistry. C, 2014-01, Vol.118 (2), p.989-993 資源來源： American Chemical Society Journals 版權： Copyright © 2013 American Chemical Society 識別號： ISSN: 1932-7447 識別號： EISSN: 1932-7455 識別號： DOI: 10.1021/jp408797t
顯示於類別:	[化學學系] 期刊論文

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