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Electrochemical oxidative adsorption and reductive desorption of a self-assembled monolayer of decanethiol on the Au(111) surface in KOH+ethanol solution

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タイトル: Electrochemical oxidative adsorption and reductive desorption of a self-assembled monolayer of decanethiol on the Au(111) surface in KOH+ethanol solution
著者: Sumi, Takayoshi 著作を一覧する
Wano, Hiromi 著作を一覧する
Uosaki, Kohei 著作を一覧する
キーワード: Self-assembled monolayer
Thiol
Electrochemical formation
Reductive desorption
発行日: 2003年 7月17日
出版者: Elsevier
誌名: Journal of Electroanalytical Chemistry
巻: 550-551
開始ページ: 321
終了ページ: 325
出版社 DOI: 10.1016/S0022-0728(03)00141-4
抄録: The electrochemical characteristics of an Au(111) electrode were investigated in 0.1 M KOH ethanol solutions containing various concentrations of decanethiol. Anodic and cathodic peaks corresponding to the oxidative adsorption and reductive desorption, respectively, of a self-assembled monolayer (SAM) of decanethiol were observed. Both peaks shifted negatively with an increase in the thiol concentration by ca. 57 mV/decade, showing that the redox process is a one-electron process. The adsorbed amount determined from the charge corresponding to the reductive desorption increased with an increase in the decanethiol concentration but never reached the saturated amount as long as the cyclic voltammograms were recorded continuously with a sweep rate of 10–200 mV s−1. The adsorption increased with the holding time at +0.1 V, which was much more positive than the anodic peak potential, and reached the saturated amount in ca. 10 min in a 10 μM thiol solution. The reductive peak potential also shifted negatively with the holding time but over a longer period. It continued to shift for ca. 60 min in the 10 μM thiol solution, which was much longer than the time taken for the adsorbed amount to reach the saturated value. These results suggest that the formation of a highly ordered SAM requires a much longer time than the adsorption of the thiol.
Relation (URI): http://www.sciencedirect.com/science/journal/00220728
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/20568
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 魚崎 浩平

 

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