Electrocatalytic response of dopamine at a thiolactic acid self-assembled gold electrode

被引：57
作者：
Wang, Q [1 ]
Jiang, N [1 ]
Li, NQ [1 ]
机构：
[1] Peking Univ, Dept Chem, Beijing 100871, Peoples R China
来源：
MICROCHEMICAL JOURNAL | 2001年 / 68卷 / 01期
基金：
中国国家自然科学基金;
关键词：
electrocatalysis; dopamine; self-assembled electrode; cyclic voltammetry; X-ray photoelectron spectroscopy;
D O I：
10.1016/S0026-265X(00)00178-8
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The thiolactic acid (TLA) self-assembled monolayer modified gold electrode (TLA/Au) is demonstrated to catalyze the electrochemical response of dopamine (DA) by cyclic voltammetry. A pair of well-defined redox waves were obtained and the calculated standard rate constant (ks) is 0.525 cm/s at the sell-assembled electrode. The electrode reaction is a reversible process. The oxidation peak of DA can be used to determine the concentration of DA. The peak current and the concentration of DA have a linear relationship in the range of 4.0 x 10(-5)-8.0 x 10(-4) mol/l. The detection limit is 3.0 x 10(-6) mol/l. The TLA-SAM was characterized with X-ray photoelectron spectroscopy (XPS) and a contact angle goniometer. (C) 2001 Elsevier Science B.V. All rights reserved.
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页码：77 / 85
页数：9
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