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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (9): 779-784. 上一篇    下一篇

研究论文

Ag核Au壳双金属复合纳米线的制备及其表面增强拉曼光谱研究

凌丽, 徐敏敏, 顾仁敖, 姚建林*   

  1. (苏州大学独墅湖校区化学化工学院 苏州 215123)
  • 投稿日期:2006-09-13 修回日期:2006-12-01 发布日期:2007-05-14
  • 通讯作者: 姚建林

Preparation of AgcoreAushell Nanowires and Their Surface Enhanced Raman Spectroscopic Studies

LING Li; XU Min-Min; GU Ren-Ao; YAO Jian-Lin*   

  1. (Department of Chemistry, Suzhou University, Suzhou 215123)
  • Received:2006-09-13 Revised:2006-12-01 Published:2007-05-14
  • Contact: YAO Jian-Lin

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采用氧化铝模板结合交流电沉积技术制备纯银纳米线, 然后通过化学还原方法, 并控制加入的金盐的量, 在已制备好的银线表面包裹不同厚度的金壳层, 得到具有核壳结构的Ag核Au壳复合纳米线. 采用电子显微镜(SEM, TEM)和表面增强拉曼光谱对该复合结构纳米线进行相关表征, 纳米线的表面形貌与加入的金盐的量有关. 以苯硫酚(TP)和对巯基苯胺(PATP)为探针分子, 研究了此类复合纳米线的表面增强拉曼散射效应. 并以PATP在金银纳米线表面吸附的表面增强拉曼光谱的差别为探针, 表征了复合纳米线表面金的包裹程度, 结果表明一定厚度的包裹程度可制备无针孔效应的核壳结构金银复合纳米线.

关键词: 模板, 银纳米线, 核壳结构, 表面增强拉曼光谱, 对巯基苯胺

Silver nanowires were prepared by anodic aluminum oxidation (AAO) template combined with AC electrodeposition. By the chemical reduction and controlling the concentration of gold salt, gold shell was covered onto the silver nanowires with different thickness to prepare AgcoreAushell nanowires. The surface morphology was dependent on the amount of gold salt. SEM, TEM and surface enhanced Raman spectroscopy (SERS) were employed to characterize the composite nanowires. Thiophenol (TP) and p-aminothiophenol (PATP) were used as probe molecules to investigate the SERS effect of the core-shell nanowires. The quality of the gold shell was identified by comparing the differences of spectral feature of PATP absorbed onto nanowire surface. The results revealed that AgcoreAushell nanowires were a potential SERS substrate and the pinhole free AgcoreAushell nanowires were obtained by controlling the shell in a certain thickness range.

Key words: template, Ag nanowire, core-shell, surface enhanced Raman spectroscopy, p-aminothiophenol