Pan Liang, Huang Yingzhou, Yang Yanna, Xiong Wen, Chen Guo, Su Xun, Wei Hua, Wang Shuxia, Wen Weijia
Soft Matter and Interdisciplinary Research Center, College of Physics, Chongqing University, Chongqing, 400044, P. R. China.
Department of Applied Physics, College of Physics, Chongqing University, Chongqing, 400044, P.R. China.
Sci Rep. 2015 Nov 25;5:17223. doi: 10.1038/srep17223.
For the novel interpretation of Raman spectrum from molecule at metal surface, the plasmon driven surface catalysis (PDSC) reactions have become an interesting topic in the research field of surface enhanced Raman scattering (SERS). In this work, the selective PDSC reactions of p,p'-dimercaptoazobenzene (DMAB) produced from para-aminothiophenol (PATP) or 4-nitrobenzenethiol (4NBT) were demonstrated in the Ag nanowires dimer-Au film systems. The different SERS spectra collected at individual part and adjacent part of the same nanowire-film system pointed out the importance of the electromagnetic field redistribution induced by image charge on film in this selective surface catalysis, which was confirmed by the simulated electromagnetic simulated electro- magnetic field distributions. Our result indicated this electromagnetic field redistribution induced selective surface catalysis was largely affected by the polarization and wavelength of incident light but slightly by the difference in diameters between two nanowires. Our work provides a further understanding of PDSC reaction in metal nanostructure and could be a deep support for the researches on surface catalysis and surface analysis.
对于金属表面分子拉曼光谱的新颖解释，等离子体驱动的表面催化（PDSC）反应已成为表面增强拉曼散射（SERS）研究领域中一个有趣的话题。在这项工作中，在银纳米线二聚体 - 金膜系统中展示了由对氨基硫酚（PATP）或4 - 硝基苯硫酚（4NBT）产生的对，对'-二巯基偶氮苯（DMAB）的选择性PDSC反应。在同一纳米线 - 膜系统的单个部分和相邻部分收集的不同SERS光谱指出了薄膜上镜像电荷引起的电磁场重新分布在这种选择性表面催化中的重要性，这通过模拟的电磁场分布得到了证实。我们的结果表明，这种电磁场重新分布引起的选择性表面催化在很大程度上受入射光的偏振和波长影响，但受两根纳米线直径差异的影响较小。我们的工作为深入理解金属纳米结构中的PDSC反应提供了进一步的认识，并可为表面催化和表面分析的研究提供有力支持。
