Facile synthesis of large-scale Ag nanosheet-assembled films with sub-10 nm gaps as highly active and homogeneous SERS substrates

Facile synthesis of large-scale Ag nanosheet-assembled films with sub-10 nm gaps as highly active and homogeneous SERS substrates
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轻松合成具有亚 10 nm 间隙的大规模银纳米片组装薄膜作为高活性且均匀的 SERS 基底

DOI:
10.1016/j.apsusc.2012.10.031
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发表时间:
2013
影响因子:
6.7
通讯作者:
Xiaoguang Zhu
Xiaoguang Zhu
中科院分区:
材料科学1区
文献类型:
--
作者:
Guowen Meng;Ting Liang;Zhuo Zhang;Xiaoguang Zhu

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我们报告了一种简单的低成本合成方法,通过原电池反应在Si衬底上的相邻纳米片之间均匀分布在10nm以下的高密度间隙的大规模银纳米片组装膜。通过调整hf蚀刻时间和溶液中柠檬酸的浓度,可以调整银纳米片在衬底上的分布密度。此外,结合传统的光刻技术,可以通过原电池诱导生长在Si衬底上实现具有不同形态的高度均匀的银纳米片组装结构。以罗丹明6G为标准测试分子,制备的大规模银纳米片组装膜具有高活性和均匀的表面增强拉曼散射(SERS)效应,并有望作为快速检测痕量多氯联苯(pcb)的可靠SERS底物。
We report a facile low-cost synthetic approach to large-scale Ag nanosheet-assembled films with a high density of uniformly distributed sub-10nm gaps between the adjacent nanosheets on Si substrates via galvanic cell reactions. The distribution density of Ag nanosheets on substrates could be tailored by tuning the duration of the HF-etching and the concentration of citric acid in the solution. Furthermore, in conjunction with a conventional photolithography, highly uniform patterned Ag nanosheet-assembled structures with different morphologies can be achieved on Si substrates via galvanic-cell-induced growth. By using rhodamine 6G as a standard test molecule, the large-scale Ag nanosheet-assembled films exhibit highly active and homogenous surface-enhanced Raman scattering (SERS) effect and also show promising potentials as reliable SERS substrates for rapid detection of trace polychlorinated biphenyls (PCBs).
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