Au Hierarchical Micro/Nanotower Arrays and Their Improved SERS Effect by Ag Nanoparticle Decoration
Au Hierarchical Micro/Nanotower Arrays and Their Improved SERS Effect by Ag Nanoparticle Decoration
复制标题
Au分层微/纳米塔阵列及其通过Ag纳米颗粒修饰改进的SERS效应
DOI：
10.1021/cg101266d
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发表时间：
2011-01
期刊：
影响因子：
--
通讯作者：
Chu, Zhaoqin
中科院分区：
文献类型：
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作者：
Zhu, Chuhong;Meng, Guowen;Huang, Qing;Huang, Zhulin;Chu, Zhaoqin
在合适的电沉积条件下，通过电化学沉积在PVP和HAuCl4的混合水溶液中，在镀金的硅平面衬底上实现了金层叠微纳米塔阵列。由于纳米塔尖尖和纳米塔间隙附近的局部电磁场增强，金层叠微/纳米塔阵列表现出明显的表面增强拉曼散射效应。更重要的是，由于银纳米粒子本身的热点以及银纳米粒子与金微纳米塔之间的界面处形成的热点，通过在金微纳米塔表面装饰银纳米粒子进一步显著提高了SERS效应。这些银纳米粒子修饰的金层次化微/纳米塔阵列在监测环境污染物方面具有潜在的应用前景，如3,3 ',4,4 ' -四氯甲烷等。
Arrays of Au hierarchical micro/nanotowers have been achieved on Au-coated silicon planar substrate, via electrochemical deposition in a mixed aqueous solution of PVP and HAuCl4 under appropriate electrodeposition conditions. The Au hierarchical micro/nanotower arrays have exhibited distinct surface-enhanced Raman scattering (SERS) effect due to the enhanced local electromagnetic field in the vicinity of the sharp nanotips of the towers and the gaps between the neighboring nanotowers. More importantly, the SERS effect has been further improved significantly via decorating Ag nanoparticles on the surfaces of the Au hierarchical micro/nanotowers due to the Ag nanoparticle hot spots themselves and the hot spots formed at the interfaces between the Ag nanoparticles and the Au micro/nanotowers. These Ag-nanoparticle-decorated Au hierarchical micro/nanotower arrays have shown potential applications as sensitive and robust SERS substrates in monitoring environmental pollutants, such as 3,3′,4,4′-tetrachlorobiphe...