第 44 卷第 4 期 Vol. 44 No. 4 2014 年 8 月 Aug 2014

所属栏目：功能材料 电化学石英晶体微天平研究重氮盐的电还原过程

张青芳1，曾 明1，黄健英2 （1. 长沙医学院 基础医学系， 湖南 长沙 400219； 2. 湖南师范大学 化学化工学院， 湖南 长沙 400081）

摘　要：采用压电电化学石英晶体微天平（EQCM）技术研究了硫酸重氮盐在裸金电极（Au）和多壁碳纳米管（MWCNTs）修饰金电极上的电还原行为，比较了2种电极上电沉积质量和稳定性。结果表明，相同循环伏安扫描条件下，重氮盐在金电极和MWCNTs／Au电极上的工作曲线还原峰电位相同，后者的初始峰电流低于前者，QCM数据显示重氮盐在MWCNTs／Au电极上沉积速度优于金电极，饱和沉积量是金电极上的3倍，表明碳纳米管催化了还原过程并增大了电极的表面积；在磷酸中性缓冲溶液中浸泡7 d后，重氮盐修饰后的MWCNTs／Au电极表面质量变化比金电极小0.28 ng，表明修饰后的MWCNTs／Au电极略稳定。

关键词：重氮盐；电还原；电化学石英晶体微天平

中图分类号：TQ150　　文献标识码：A　　文章编号：1009-9212（2014）04-0055-04

Study on Electro-reduction of Benzenediazonium Sulfate with Electrochemical Quartz Crystal Microbalance

ZHANG Qing-fang1, ZENG Ming1, HUANG Jian-ying2 (1. Department of Chemistry, Faculty of Preclinical Medicine, Changsha Medical University, Changsha 400219, China; 2. College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China)

Abstract：The electrochemical quartz crystal microbalance(EQCM) technique was used to study the adsorption and electro-reduction behavior of benzenediazonium sulfate on bare and multi-walled carbon nanotubes(MWCNTs) modified gold electrodes. Diazonium salt could be similarly adsorbed on the surface of Au electrode and MWCNTs/Au electrode by cyclic voltammetry, the reduction peak potentials were the same and the peak current of the later was lower than that of the former. The adsorption amount of diazonium salts on MWCNTs/Au electrode was three times of that on Au electrode, indicating that the electro-reduction was catalyzed and the electrode surface area was increased by MWCNTs. The mass variation of MWCNTs/Au electrode was 0.28 ng smaller than bare Au electrode after immersed for 7 days in PBS, meaning the film on the former was slightly more stable than on the later.

Key words：diazonium salts; electro-reduction; electrochemical quartz crystal microbalance

基金项目：石英晶体微天平用于碱性磷酸酶标记抗原的电化学酶联免疫分析（院级科研课题）。

作者简介：张青芳（1985-），女，湖南岳阳人，讲师，硕士，研究方向：电化学分析（E-mail：187364593@qq.com）。

收稿日期：2014-03-20