Electrochemical behavior of Au colloidal electrode through layer-by-layer self-assembly

被引:62
作者
Lu, M [1 ]
Li, XH [1 ]
Yu, BZ [1 ]
Li, HL [1 ]
机构
[1] Lanzhou Univ, Dept Chem, Lanzhou 730000, Peoples R China
基金
中国国家自然科学基金;
关键词
self-assembling; nanoparticles; cyclic voltammetry; electrochemical impedance spectroscopy;
D O I
10.1006/jcis.2002.8238
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Electrodes formed by Au colloidal nanoparticles have been obtained by layer-by-layer self-assembly using 1,6-hexanedithiol as cross-linkers. Cyclic voltammograms show that the peak-to-peak separation decreases as the number of Au colloidal layers increases. After seven layers of Au colloidal particles have been deposited, the multilayer electrodes have the electrochemical properties of metallic Au and show ideal microelectrode behavior. An equivalent circuit for the electrochemical impedance spectroscopy was established to model the working electrode. It is evident that by increasing the layer number of Au colloidals, the interfacial electron transfer is promoted, implying the electron-transfer process changes from a kinetically limited process to a diffusionaIly limited process. (C) 2002 Elsevier Science (USA).
引用
收藏
页码:376 / 382
页数:7
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