Potential regulation of the spectroelectrochemical response of monolayer-protected gold cluster films by electrolyte composition
Potential regulation of the spectroelectrochemical response of monolayer-protected gold cluster films by electrolyte composition
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DOI：
10.1021/jp066304a
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发表时间：
2007-02
影响因子：
3.7
通讯作者：
V. Ruiz;Á. Colina;A. Heras;J. López-Palacios
中科院分区：
文献类型：
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作者：
V. Ruiz;Á. Colina;A. Heras;J. López-Palacios
采用紫外-维斯反射光谱电化学石英晶体微天平研究了金电极上的C6-Au 147原子簇多层膜在含有不同疏水度电解质阴离子（PF 6-、ClO 4-、BF 4-和NO3-）的水溶液中的光谱电化学行为.的多响应技术，使我们能够同时测量电位依赖的反射率和重量的变化，在膜中的C6-Au 147 MPC在不同的电解质介质中的逐步充电。由于C6-Au 147 MPC的量化充电，薄膜反射率的变化被证明对所使用的电解质阴离子的疏水性和浓度非常敏感。因此，充电电流的起始电势以及因此反射衰减随着电解质阴离子的浓度/疏水性的降低而阳极偏移。此外，薄膜的反射率的变化幅度所造成的每一个…
The spectroelectrochemistry of multilayer films of hexanethiolate-protected Au147 clusters (C6-Au147 MPCs) supported on gold electrodes has been investigated by UV−vis reflectance spectroelectrochemical quartz crystal microbalance in aqueous solutions containing electrolyte anions with different degrees of hydrophobicity (PF6-, ClO4-, BF4-, and NO3-). The multiresponse technique has enabled us to measure simultaneously potential-dependent reflectance and gravimetric changes in the film during the stepwise charging of the C6-Au147 MPCs in different electrolytic media. Changes in the film reflectance, due to quantized charging of the C6-Au147 MPCs, proved to be very sensitive to both the hydrophobicity and concentration of the electrolyte anion used. Thus, the onset potential for the charging current and consequently, the reflectance attenuation, shifted anodically with decreasing concentration/hydrophobicity of the electrolyte anion. Moreover, the magnitude of the film reflectance changes resulting from ea...