膜电阻对自组装膜修饰电极电化学行为的影响

电化学（中英文） ›› 2001, Vol. 7 ›› Issue (3): 270-275.

膜电阻对自组装膜修饰电极电化学行为的影响

崔晓莉,江志裕

复旦大学化学系!上海200433,复旦大学化学系!上海200433

收稿日期:2001-08-28 修回日期:2001-08-28 出版日期:2001-08-28 发布日期:2001-08-28

The Influence of Membrane Resistance on the Electrochemical Behavior of Gold Electrode Modified by Self-assembled Monolayer

CUI Xiao_li,JIANG Zhi_yu *

(Dept. of Chem.,Fudan Univ.,Shanghai, 200433, China

Received:2001-08-28 Revised:2001-08-28 Published:2001-08-28 Online:2001-08-28

摘要/Abstract

摘要： 应用循环伏安和交流阻抗技术研究了 16烷基硫醇自组装膜修饰的金电极在Fe(CN) 63 - /Fe(CN) 64 - 溶液中的电化学行为 .无“针孔”缺陷的自组装膜对溶液与基底间的界面电子转移具有强烈的阻碍作用 ,当过电位较大时 ,In(I/ η)对 η1/2 之间具有良好的线性关系 .通过对Au/SAM /Hg模拟体系的电流———电压曲线进行测定 ,得到了自组装膜膜电阻的特征 .指出由于膜电阻的存在 ,自组装膜修饰电极在Fe(CN) 63 - /Fe(CN) 64 - 溶液中的行为实质上反映了膜自身的电阻特征

关键词: 自组装单分子层膜, 修饰电极, 膜电阻, 电阻极化

Abstract: The electrochemical behavior of gold electrode modified by hexadecanethiol self_assembled monolayer (SAM) in the solution of Fe(CN) 6 3- /Fe(CN) 6 4- was investigated by cyclic voltammetry and ac impedance spectroscopy. The pinhole_free SAM_modified gold electrode has excellent blocking properties to the interfacial electron transfer from redox couple in solution to the substrate. The current increased exponentially with the overpotential at the high potential region. A good linear relationship between ln( I/η ) and η 1/2 was observed. A model system Au/SAM/Hg was constructed and its I～V curve was measured. Similar phenomena were observed. There was also a linear relationship between ln( I/V ) and V 1/2 at high voltage region. It is proposed that the characteristic of pinhole_free SAM_modified gold electrode in solution of Fe(CN) 6 3- /Fe(CN) 6 4- mainly belongs to the resistance of the self_assembled monolayer itself.

Key words: Self_assembled monolayers, Modified electrode, Resistance of membrane, Resistance polarization

中图分类号:

O646

崔晓莉,江志裕. 膜电阻对自组装膜修饰电极电化学行为的影响[J]. 电化学（中英文）, 2001, 7(3): 270-275.

CUI Xiao_li,JIANG Zhi_yu * . The Influence of Membrane Resistance on the Electrochemical Behavior of Gold Electrode Modified by Self-assembled Monolayer[J]. Journal of Electrochemistry, 2001, 7(3): 270-275.

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链接本文: https://electrochem.xmu.edu.cn/CN/

https://electrochem.xmu.edu.cn/CN/Y2001/V7/I3/270

参考文献

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