高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (10): 1779.

• 论文 • 上一篇    下一篇

微电极研究单分子层保护团簇的量子化电容充电

陈玉静, 胡效亚, 王胤, 郭荣   

  1. 扬州大学瘦西湖校区化学化工学院, 扬州 225002
  • 收稿日期:2002-11-27 出版日期:2003-10-24 发布日期:2003-10-24
  • 通讯作者: 胡效亚(1960年出生),男,博士,教授,从事电化学和电分析化学研究.E-mail:hxy@yzcn.net E-mail:hxy@yzcn.net
  • 基金资助:

    国家自然科学基金(批准号:20175023);江苏省自然科学基金(批准号:BK2002045)资助

Studies on Quantized Capacitance Charging of Monolayer-protected Clusters with Microelectrode

CHEN Yu-Jing, HU Xiao-Ya, WANG Cheng-Yin, GOU Rong   

  1. College of Chemistry and Chemical Engineering, Yangzhou University, Shouxihu Campus, Yangzhou 225002, China
  • Received:2002-11-27 Online:2003-10-24 Published:2003-10-24

摘要: 利用微电极在二氯甲烷溶液中研究了单分子层保护金纳米团簇(MPCs)的量子化电容充电效应.用示差脉冲伏安法及循环伏安法获得了明显的5对量子化电容充电峰,并测量出单个MPCs的平均电容.单阶跃计时库仑法的研究表明,每对峰对应于一个电子的充入或放出.求得电荷传递系数α=0.44和反应速率常数k0=1.65×10-2cm/s.与常规铂电极相比,微电极可获得更明显的量子化充电峰.

关键词: 微电极, 单分子保护团簇, 量子化电容充电

Abstract: Measuring the quantized capacitance charge of the C6Au monolayer protected clusters(MPCs) in the dichloromethane solution with the microelectrode was reported.The results from cyclic voltammetry(CV) and differential pulse voltammetry(DPV) showed five pairs of quantized capacitance charging peaks in dichloromethane solution.The average capacitance of single MPCs was obtained from the result of DPV.Single potential step chronocoulometry was used to demonstrate that each pair of the peaks corresponded to one electron transferring across the interface of the MPCs.From the i l,s of the CV of the microelectrode, the charge transfer coefficient α was evaluated.Compared to the conventional Pt electrode, the microelectrode exhibits obvious and well-defined peaks, and is favorable in the study of MPCs in the solution with a high impedance without supporting electrolyte and in the process of high sweep rate.

Key words: Microelectrode, Monolayer-protected clusters, Quantized capacitance charging

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