Electrochemical quantized capacitance charging of surface ensembles of gold nanoparticles
Electrochemical quantized capacitance charging of surface ensembles of gold nanoparticles
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DOI：
10.1021/jp992681u
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发表时间：
1999-11-11
影响因子：
3.3
通讯作者：
Murray, RW
中科院分区：
文献类型：
--
作者：
Chen, SW;Murray, RW
对固定在宏观金电极上的纳米级单分子层保护金团簇(Au MPC)的单分子层进行了量子化的双层电容充电。星团有两种固定方式。一种方法包括将覆盖有丁硫醇单分子膜的MPC与Au表面预制的4，4‘-硫代二苯硫醇(TBBT)自组装单分子膜进行配位交换结合。在第二种方法中，制备了具有混合的TBBT/正庚硫醇单分子膜的MPC；这种表面反应的团簇将自身锚定在金电极表面。这些MPC单分子膜的差示脉冲伏安法(DPV)显示出一系列电流峰，其电位轴上的规则间距与相同的非锚定MPC溶液的DPV中的电流峰相似。MPC单分子膜的交流阻抗测量显示，电容波动反映了DPV的结果。
Quantized double layer capacitance charging is observed for monolayers of nanometer-sized monolayer protected gold clusters (Au MPCs) anchored to macroscopic gold electrodes. The clusters were anchored in two ways. One method involves ligand place-exchange binding of an MPC covered with a butanethiolate monolayer to a preformed, self-assembled monolayer of 4,4'-thiobisbenzenethiol (TBBT) on Au. In the second method, an MPC with a mixed TBBT/heptanethiolate monolayer is prepared; this surface-reactive cluster anchors itself onto a gold electrode surface. Differential pulse voltammetry (DPV) of these MPC monolayers displays a succession of current peaks whose regular spacing on the potential axis is similar to that in DPV of solutions of the same, nonanchored MPCs. AC impedance measurements of the MPC monolayers show capacitance undulations that mirror the DPV results.