物理化学学报 >> 2004, Vol. 20 >> Issue (02): 207-210.doi: 10.3866/PKU.WHXB20040221

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L-半胱氨酸自组装膜修饰金电极的电化学特性

傅崇岗;苏昌华;单瑞峰   

  1. 聊城大学化学化工学院,聊城 252059
  • 收稿日期:2003-07-25 修回日期:2003-09-18 发布日期:2004-02-15
  • 通讯作者: 傅崇岗 E-mail:cgfu@lctu.edu.cn

Electrochemical Properties of L-cysteine Self-assembled Membrane Modified Gold Electrode

Fu Chong-Gang;Su Chang-Hua;Shan Rui-Feng   

  1. School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059
  • Received:2003-07-25 Revised:2003-09-18 Published:2004-02-15
  • Contact: Fu Chong-Gang E-mail:cgfu@lctu.edu.cn

摘要: 采用电化学石英晶体微天平(EQCM)和循环伏安法(CV)研究了L-半胱氨酸在金电极表面形成自组装膜的机理及其电化学性质.结果表明, L-半胱氨酸分子在金电极表面有特性吸附,而且在等电点pH附近因静电引力和氢键作用形成分子对,从而自组装形成双层膜.该膜电极在0.2 mol•L-1的醋酸缓冲溶液中,于-0.2~0.5 V(vs SCE)间CV扫描出现了一对稳定的氧化还原峰,并对抗坏血酸的氧化有良好的催化作用.

关键词: L-半胱氨酸, 自组装双层膜, 电化学石英晶体微天平, 循环伏安, 电化学行为

Abstract: Electrochemical quartz crystal microbalance and cyclic voltammetry were employed for studying the formation mechanism and electrochemical properties of the self-assembled membrane formed on the surface of the gold electrode. Experimental results show that specific interaction exists between L-cysteine and the gold electrode surface, additionally, the L-cysteine molecular pairs were formed due to the existence of electrostatic attraction and hydrogen bond between themselves in the solution with the pH around isoelectric point. Consequently, an L-cysteine self-assembled bilayer could be formed on the gold electrode surface. A pair of stable redox peaks were observed with the self-assembled bilayer modified gold electrode when potential scanning in 0.2 mol•L-1 Hac-NaAc buffer solution in the range of -0.2~0.5 V (vs SCE). It was also found that the modified electrode has an obvious electrocatalytic effect on the electrooxidation of ascorbic acid.

Key words: L-cysteine, Self-assembled bilayer, Electrochemical quartz crystal microbalance, Cyclic voltammetry, Electrochemical characteristics