Surface-Enhanced Raman Scattering from Synergistic Contribution of Metal and Semiconductor in TiO2/MBA/Ag(Au) and Ag(Au)/MBA/TiO2 Assemblies
Surface-Enhanced Raman Scattering from Synergistic Contribution of Metal and Semiconductor in TiO2/MBA/Ag(Au) and Ag(Au)/MBA/TiO2 Assemblies
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TiO2/MBA/Ag(Au) 和 Ag(Au)/MBA/TiO2 组件中金属和半导体协同作用的表面增强拉曼散射
DOI：
10.1021/jp302139e
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发表时间：
2012-07-12
影响因子：
3.7
通讯作者：
Zhao, Bing
中科院分区：
文献类型：
--
作者：
Jiang, Xin;Li, Xiuling;Zhao, Bing
将传统的金属SERS活性基底（Ag或Au）和新型的半导体SERS活性基底（TiO 2）结合成复合体系，利用它们对Sers的协同贡献。采用自组装方法制备了一系列4-巯基苯甲酸（4-MBA）分子、TiO 2和/或Ag（Au）纳米粒子（NPs）的组装体。在TiO 2/MBA/Ag（Au）和Ag（Au）/MBA/TiO 2两种三明治结构组装体中，4-MBA分子的Sers信号与TiO 2/MBA组装体中的Sers信号相比，无论是强度还是拉曼频率都有明显的差异，这归因于金属的引入及其与TiO 2纳米粒子的相互作用/协同作用。4-MBA分子的Sers增强行为强烈依赖于金属和4-MBA分子的性质，这会影响TiO 2分子与分子之间的电荷转移以及由此产生的附加电磁场效应。本文的工作对表面增强Sers技术的理论发展和实际应用都具有重要意义。
Traditional metal SERS-active substrate (Ag or Au) and novel semiconductor SERS-active substrate (TiO2) are combined into the composite system for their synergetic contribution to SERS. A series of assemblies with 4-mercaptobenzoic acid (4-MBA) molecule, TiO2, and/or Ag (Au) nanoparticles (NPs) have been fabricated by a self-assembly method. In the sandwich structure assemblies (TiO2/MBA/Ag(Au) and Ag(Au)/MBA/TiO2), the SERS signals of 4-MBA molecule exhibit obvious difference in not only the intensity but also Raman frequency as compared with that SERS enhancement in the TiO2/MBA, which is attributed to the introduce of metals and its interaction/synergistic action with TiO2 NPs. SERS enhancement behaviors of 4-MBA in the sandwich-structure assemblies strongly depend on the natures of metals and 4-MBA molecule, which can result in a influence on the TiO2-to-molecule charge transfer and consequent additional EM field effect. This work would like to be interesting and of considerable value for both theory development and practice application of SERS technology.