In Situ Probing of Dynamic Nanostructural Change of Electrodeposits in the Course of Oscillatory Growth Using SERS
In Situ Probing of Dynamic Nanostructural Change of Electrodeposits in the Course of Oscillatory Growth Using SERS
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DOI：
10.1021/jp0684776
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发表时间：
2007-02
影响因子：
3.7
通讯作者：
Kazuhiro Fukami;Shuji Nakanishi;Y. Sawai;K. Sonoda;K. Murakoshi;Y. Nakato
中科院分区：
文献类型：
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作者：
Kazuhiro Fukami;Shuji Nakanishi;Y. Sawai;K. Sonoda;K. Murakoshi;Y. Nakato
采用表面增强拉曼散射（Sers）技术，原位研究了振荡电沉积法在液/气界面上制备的金（Au）薄膜的纳米结构动态变化。Au膜的振荡形成被解释为考虑到，在扩散限制条件下进行的电沉积时，电位在振荡过程中向正移动，而在反应限制条件下进行的负电位移动。在振荡条件下形成的沉积物的非原位SEM检查显示，每个电位偏移都伴随着针状纳米晶体的生长和通过纳米针的增厚和聚结分别形成连续膜。当电位从振荡的负端移动到正端时，Sers强度较高，而当电位从正端移动到负端时，SERS强度变得较低，清楚地表明Sers探测了在振荡电沉积过程中从纳米针到沉积物的连续膜的动态纳米结构变化。
Dynamic nanostructural change of a gold (Au) thin film formed at a liquid/air interface by oscillatory electrodeposition was probed by surface-enhanced Raman scattering (SERS) under in situ condition. The oscillatory formation of the Au film was explained by taking into account that the electrodeposition proceeded under diffusion-limited conditions when the potential shifts to the positive during the potential oscillation, whereas it proceeded under reaction-limited conditions during the negative potential shift. Ex situ SEM inspections of the deposits formed under the oscillatory conditions revealed that each potential shift is accompanied by growth of needle-like nanocrystals and formation of a continuous film via the thickening and coalescing of the nanoneedles, respectively. The SERS intensity was high when the potential moves from the negative end to the positive end of the oscillation, whereas it became lower when the potential moves from the positive to the negative end, clearly indicating that the SERS probes the dynamic nanostructural change from the nanoneedles into a continuous film of the deposits in the course of the oscillatory electrodeposition.