• 文献标题:   Graphene-coupled nanowire hybrid plasmonic gap mode-driven catalytic reaction revealed by surface-enhanced Raman scattering
  • 文献类型:   Article
  • 作  者:   LI Z, PAN Y, YOU QZ, ZHANG LS, ZHANG D, FANG Y, WANG PJ
  • 作者关键词:   graphene, nanowire, plasmonic gap mode, plasmondriven catalytic reaction, surface enhancement raman scattering sers
  • 出版物名称:   NANOPHOTONICS
  • ISSN:   2192-8606 EI 2192-8614
  • 通讯作者地址:   Capital Normal Univ
  • 被引频次:   0
  • DOI:   10.1515/nanoph-2020-0319
  • 出版年:   2020

▎ 摘  要

The single-layer graphene (SLG)-coupled nanowire (NW) hybrid plasmonic gap mode (PGM)-driven molecular catalytic reaction was investigated experimentally and theoretically. First, an SLG-coupled NW was constructed, then the surface-enhanced Raman scattering (SERS) effect of graphene in the hybrid plasmonic gap was studied via the normal and oblique incidence of excitation light. The SERS peaks of the D and G of graphene are more intensely enhanced by oblique incidence than by normal incidence. Furthermore, the catalytic reaction of the dimerization of the 4-nitrobenzenethiol molecule to p,p'-dimercaptoazobenzene molecule driven by PGM was carried out by SERS. It was demonstrated that the efficiency of the PGM-driven catalytic reaction is much higher for oblique incidence than that for normal incidence. The mechanism of the PGM-driven catalytic reaction was studied by a finite-difference time-domain numerical simulation. When the PGM is excited by oblique incidence with theta = 30 degrees, the coupling between the NW and SLG/SiO2 substrate increases to the maximum value. This is clearly evidenced by the excitation of a vertical bonding dipolar plasmon mode under the dipole approximation. The theoretical and experimental results were consistent with each other. This research may open up a pathway toward controlling PGM-driven catalytic reactions through polarization changes in excitation laser incidence on single anisotropic nanostructures.