采用浸渍技术,分别以新鲜和老化两组硅纳米孔柱阵列(Si-NPA)衬底为模板制备了不同形貌特征的Au/Si-NPA.结果表明:造成两组衬底上形成的Au/Si-NPA形貌上的巨大差异主要是由于两组Si-NPA衬底表面氧含量的分布不同所致.进一步分析发现,Si-NPA在Au/Si-NPA的形成过程中既起到了模板作用,又起到了还原的双重作用.由于Si-NPA具有规则的阵列结构,从而使得金在Si-NPA表面上的沉积速率产生选择性,最终可以形成准周期的、规则的金纳米复合薄膜.
The Au/Si-NPA samples with different morphologies were fabricated experimentally by immersion technique using fresh and aged silicon nanoporous pillar array (Si-NPA)substrates as template. The results show that the differences between morphologies of the Au/Si-NPAs which were prepared on two kinds of substrates are due to the differences of oxygen quantities distributing on the surface of the Si-NPA substrates. The further studies show that the Si-NPA present two functionalities during fabricating of the Au/Si-NPA. One is as the reductant and another the template. The Si-NPA regular array structure leads to the velocity dependence of Au deposition on the local geometrical features of the Si-NPA surface. Finally, the quasi-periodical, regular Au nanocomposite thin film has been formed.
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