title: Electromagnetic field redistribution induced selective plasmon driven surface catalysis in metal nanowire-film systems.
abstract: 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.
authors.affiliation: Soft Matter and Interdisciplinary Research Center, College of Physics, Chongqing University, Chongqing, 400044, P. R. China.
authors.forename: Liang
authors.initials: L
authors.lastname: Pan
authors.affiliation: Soft Matter and Interdisciplinary Research Center, College of Physics, Chongqing University, Chongqing, 400044, P. R. China.
authors.forename: Yingzhou
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Soft Matter and Interdisciplinary Research Center, College of Physics, Chongqing University, Chongqing, 400044, P. R. China.
authors.forename: Yanna
authors.initials: Y
authors.lastname: Yang
authors.affiliation: Department of Applied Physics, College of Physics, Chongqing University, Chongqing, 400044, P.R. China.
authors.forename: Wen
authors.initials: W
authors.lastname: Xiong
authors.affiliation: Department of Applied Physics, College of Physics, Chongqing University, Chongqing, 400044, P.R. China.
authors.forename: Guo
authors.initials: G
authors.lastname: Chen
authors.affiliation: Department of Applied Physics, College of Physics, Chongqing University, Chongqing, 400044, P.R. China.
authors.forename: Xun
authors.initials: X
authors.lastname: Su
authors.affiliation: Department of Applied Physics, College of Physics, Chongqing University, Chongqing, 400044, P.R. China.
authors.forename: Hua
authors.initials: H
authors.lastname: Wei
authors.affiliation: Department of Applied Physics, College of Physics, Chongqing University, Chongqing, 400044, P.R. China.
authors.forename: Shuxia
authors.initials: S
authors.lastname: Wang
authors.affiliation: Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
authors.forename: Weijia
authors.initials: W
authors.lastname: Wen