Plasmon-driven reaction controlled by the number of graphene layers and localized surface plasmon distribution during optical excitation  

作　　者：Zhi-gao Dai Xiang-heng Xiao Wei Wu Yu-peng Zhang Lei Liao Shi-shang Guo Jian-jian Ying Chong-xin Shan Meng-tao Sun Chang-zhong Jiang 

机构地区：[1]Department of Physics and Key Laboratory of Artificial Micro-and Nano-structures of the Ministry of Education,Hubei Nuclear Solid Physics Key Laboratory,Wuhan University,Wuhan 430072,China [2]Laboratory of Functional Nanomaterials and Printed Electronics,School of Printing and Packaging,Wuhan University,Wuhan 430072,China [3]State Key Laboratory of Luminescence and Applications,Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China [4]School of Physical Engineering,Zhengzhou University,Zhengzhou 450052,China [5]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Light(Science & Applications)》2015年第1期137-143,共7页光（科学与应用)（英文版）

基　　金：This work was partially supported by the NSFC(51171132,U1260102,51371131,11375134,11374353,and 91436102),NCET(12-0418);Hubei Provincial Natural Science Foundation(2011CDB270,2012FFA042);Jiangsu Provincial Natural Science Foundation(BK20141217);Wuhan Planning Project of Science and Technology(2014010101010019);the Wuhan University Experiment Technology Project Funding,the Fundamental Research Funds for the Central Universities(2042015kf1012,2042015gf0016)

摘　　要：Graphene-plasmonic hybrid platforms have attracted an enormous amount of interest in surface-enhanced Raman scattering(SERS);however,the mechanism of employing graphene is still ambiguous,so clarification about the complex interaction among molecules,graphene,and plasmon processes is urgently needed.We report that the number of graphene layers controlled the plasmon-driven,surface-catalyzed reaction that converts para-aminothiophenol(PATP)-to-p,p'-dimercaptoazobenzene(DMAB)on chemically inert,graphene-coated,silver bowtie nanoantenna arrays.The catalytic reaction was monitored by SERS,which revealed that the catalytic reaction occurred on the chemical inertness monolayer graphene(1G)-coated silver nanostructures.The introduction of 1G enhances the plasmon-driven surface-catalyzed reaction of the conversion of PATP-to-p,p'-DMAB.The chemical reaction is suppressed by bilayer graphene.In the process of the catalytic reaction,the electron transfer from the PATP molecule to 1G-coated silver nanostructures.Subsequently,the transferred electrons on the graphene recombine with the hot-hole produced by the localized surface plasmon resonance of silver nanostructures.Then,a couple of PATP molecules lost electrons are catalyzed into the p,p'-DMAB molecule on the graphene surface.The experimental results were further supported by the finite-difference time-domain method and quantum chemical calculations.

关 键 词：GRAPHENE graphene-mediated SERS plasmon-driven reaction SERS 

分 类 号：O64[理学—物理化学]