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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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Title: Electrochemical oxidative adsorption and reductive desorption of a self-assembled monolayer of decanethiol on the Au(111) surface in KOH+ethanol solution
Authors: Sumi, Takayoshi Browse this author
Wano, Hiromi Browse this author
Uosaki, Kohei Browse this author
Keywords: Self-assembled monolayer
Thiol
Electrochemical formation
Reductive desorption
Issue Date: 17-Jul-2003
Publisher: Elsevier
Journal Title: Journal of Electroanalytical Chemistry
Volume: 550-551
Start Page: 321
End Page: 325
Publisher DOI: 10.1016/S0022-0728(03)00141-4
Abstract: 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: http://www.sciencedirect.com/science/journal/00220728
Type: article (author version)
URI: http://hdl.handle.net/2115/20568
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 魚崎 浩平

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