Electrochemical desorption of a self-assembled monolayer of alkanethiol in ionic liquids
Electrochemical desorption of a self-assembled monolayer of alkanethiol in ionic liquids
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DOI：
10.1016/j.jelechem.2007.12.003
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发表时间：
2008-04-15
影响因子：
4.5
通讯作者：
Kuwabata, Susumu
中科院分区：
文献类型：
--
作者：
Oyamatsu, Daisuke;Fujita, Takeshi;Kuwabata, Susumu
研究了正烷硫醇自组装单层（SAM）在四种离子液体中的电化学解吸。线性电位扫描伏安法首次发现，即使在离子液体中，也会发生SAM的还原解吸。随着烷烃硫醇SAM的烷基链长度的增加，其电位峰发生了负移，这与SAM在水溶液中还原性脱附的情况类似。然而，阴极波随着链长的增加而变宽，尽管在水溶液中测量时其宽度变窄。通过对比实验得到的伏安图和数值模拟的伏安图，讨论了还原脱附在所有离子液体和所有水溶液中的相反行为。根据得到的结果，我们提出了一种合理的反应方案，其中阳离子主要作为生成的烷硫代酸酯的电荷补偿剂，阴离子作为溶剂。(C) 2007 Elsevier B.V.版权所有
Electrochemical desorption of a self-assembled monolayer (SAM) of n-alkanethiols was investigated in four kinds of ionic liquids. It was found for the first time by linear potential sweep voltammetry that reductive desorption of the SAM took place even in ionic liquids. The potential peak was negatively shifted with an increase in the alkyl chain length of the alkanethiol SAM in a manner similar to that for the case of reductive desorption of the SAM in an aqueous solution. However, the cathodic wave broadened with an increase in chain length, although its width became narrow in the case of measurements in an aqueous solution. The contrary behaviors of reductive desorption in all ionic liquid and in all aqueous solution were discussed by comparing the experimentally obtained voltammograms with numerically simulated ones. Based on the results obtained, we propose a plausible reaction scheme in which cations work mainly as charge compensators for generated alkanethiolates and anions work as a solvent. (C) 2007 Elsevier B.V. All rights reserved.