材料科学
拉曼散射
纳米结构
罗丹明6G
基质(水族馆)
纳米棒
拉曼光谱
纳米技术
纳米片
氧化锡
溅射沉积
纳米颗粒
兴奋剂
光电子学
溅射
薄膜
分子
光学
物理
地质学
海洋学
有机化学
化学
作者
Yanfen Wang,Shuai Ma,Hai Yu,Yin Liu,Juan Gao,Lei Yang,Miao Zhang,Gang He,Zhaoqi Sun
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2020-11-26
卷期号:32 (7): 075708-075708
被引量:12
标识
DOI:10.1088/1361-6528/abc5f4
摘要
Ag/TiO2 nanostructure arrays were constructed on fluorine-doped tin oxide (FTO) via a controllable hydrothermal route and a magnetron sputtering method with a variety of TiO2 arrays decorated by Ag nanoparticles. Effects of different TiO2 arrays on the microstructure, composition, and optical properties of the samples were revealed. As surface enhanced Raman scattering (SERS) active substrates, we discussed the sensitivity and reproducibility of Ag/TiO2 nanostructure arrays for Rhodamine 6G (R6G) molecule detection. It was found that TiO2 nanosheet (TiO2(S)) array as a supporting made Ag nanoparticles have a uniform and continuous distribution, which achieved much higher SERS signals. The obtained Ag/TiO2(S) substrate had an improved enhancement factor of 4.31 × 105 compared with the other Ag/TiO2 nanostructure arrays of nanorods, nanotubes, and nanotrees. Furthermore, Ag/TiO2(S) active substrate showed good reproducibility with low relative standard deviation values. Such a remarkable SERS activity could be due to the synergistic effect of electromagnetic enhancement and charge transfer enhancement. Moreover, the TiO2(S) array with high-exposed {101} facets provided a large adhesion area and generated a strong interaction with external atoms, which would produce high-density 'hot spots' of SERS.
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