微电极研究单分子层保护团簇的量子化电容充电  

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

作　　者：陈玉静[1] 胡效亚[1] 王胤 郭荣[1] 

机构地区：[1]扬州大学瘦西湖校区化学化工学院,扬州225002

出　　处：《高等学校化学学报》2003年第10期1779-1783,共5页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :2 0 175 0 2 3 );江苏省自然科学基金 (批准号 :BK2 0 0 2 0 45 )资助

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× 1 0 -2 cm/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 .Measuring the quantized capacitance charge of the C 6Au 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.

关 键 词：微电极 单分子层保护团簇 量子化电容充电 金纳米团簇 电化学 

分 类 号：O614.123[理学—无机化学] O657.1[理学—化学]