纳米树枝状银的电化学制备及其光学性质

Preparation of silver dendritic nanostructure using electrochemical deposition and their optical properties

采用化学电沉积的方法在导电玻璃表面制备了银的二维纳米树枝状结构。通过调节沉积电压可以得到不同形貌和尺寸的树枝状银结构。研究发现，在一定范围内，沉积电压越高，制备的树枝状结构密度和尺寸越小。在银树枝表面沉积绝缘薄膜，将它与未沉积绝缘薄膜的银树枝组合成“三明治”结构，测试了它的光透过率。实验表明，由0．9V沉积电压下制备的树枝状银组成的“三明治”复合结构在360～800nm范围内对多种频率的光有吸收，光透射曲线呈锯齿状，这种特殊的光透射行为可能是光波在“三明治”结构间电磁响应引起的。

In this paper, two-dimensional silver dendriticlike nanostructure with controllable shape and size was prepared on the surface of ITO conductive glass using electrochemical deposition method. It is shown that voltage is essential to control figure size of the dendritic structure. Insulated film was supported on the silver dendritic structure by electrochemical method and combined with the nondepositional structure aspectantly to form ＂sandwich＂ configuration. We found that the sample prepared at 0.9V can absorb different light wave between 360nm and 800nm, and the transmission curves present a serration. This special behavior of transmission is likely as the result of electromagnetic respondence.