引用本文:
傅崇岗, 苏昌华, 单瑞峰. L-半胱氨酸自组装膜修饰金电极的电化学特性[J]. 物理化学学报,
2004, 20(02): 207-210.
doi:
10.3866/PKU.WHXB20040221
Citation: Fu Chong-Gang, Su Chang-Hua, Shan Rui-Feng. Electrochemical Properties of L-cysteine Self-assembled Membrane Modified ld Electrode[J]. Acta Physico-Chimica Sinica, 2004, 20(02): 207-210. doi: 10.3866/PKU.WHXB20040221
Citation: Fu Chong-Gang, Su Chang-Hua, Shan Rui-Feng. Electrochemical Properties of L-cysteine Self-assembled Membrane Modified ld Electrode[J]. Acta Physico-Chimica Sinica, 2004, 20(02): 207-210. doi: 10.3866/PKU.WHXB20040221
L-半胱氨酸自组装膜修饰金电极的电化学特性
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.
English
Electrochemical Properties of L-cysteine Self-assembled Membrane Modified ld Electrode
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 ld electrode. Experimental results show that specific interaction exists between L-cysteine and the ld 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 ld electrode surface. A pair of stable redox peaks were observed with the self-assembled bilayer modified ld 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.
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