Surface Plasmon-assisted Catalytic Coupling Reaction Based On SERS Monitoring

Surface-enhanced Raman scattering(SERS)in spectroscopy is a recently emerging and highly regarded emerging discipline.With the development of nanomaterials synthesis technology,processing technology,and high-precision measurement and characterization technology,the discipline has been applied to many fields such as chemistry,biology,and physics,and surface-enhanced Raman scattering technology has also been used in high-precision chemical reaction control,this extremely important application prospect has become a hot topic at home and abroad.As far as its research trend is concerned,the unique measurement advantage of surface-enhanced Raman scattering has been widely applied to the detection of material quality and surface plasmon-assisted chemical reactions,so applying it to the detection of complex substances and tracking chemical reactions has become an inevitable trend of research.Therefore,this paper is based on the basic theory of surface-enhanced Raman spectroscopy processing technology,the combination of theory and experiment,especially for surface-enhanced Raman scattering technology to monitor surface plasmon-assisted chemical reactions.(1)Based on SERS study of plasmon(electron-hole)assisted catalytic model reaction,ie,p-nitrothiophenol(PNTP)to generate 4,4'-dimercaptoazobenzene(DMAB),surface plasmon-assisted catalyzed chemical reactions and traditional organic chemical reactions were compared.By comparison we found that the plasmon-assisted catalytic coupling reactions occurring on the metal surface are not the same as the traditional organic chemical mechanisms.At the same time,through the analysis of the necessary conditions for the reaction,the first regulatory strategy was proposed for such reactions,namely,the effective regulation of the reaction through the nature of the acid added in the system.(2)The SERS technique was used to study another regulation strategy of coupling reaction of PNTP to DMAB.This strategy further studies the capture effect of organic alkalines on holes by evaluating the effect of hot electron-hole pairs on the reaction.It was found that the reaction was affected by the compatibility of organic alkalines and Ag NPs.Finally,a comprehensive analysis of the different SERS signals collected shows that organic alkaline hydrolysis products can capture holes to ensure the integrity of the SERS substrate.The work of this topic not only helps us to clarify the reason for the signal enhancement after the target molecule is adsorbed on the metal surface,but also provides us with a new control strategy for the plasmon-assisted catalytic reaction.In addition,the study of azobenzene can further help us to apply azobenzene to actual optical molecular switches.