Label-Free SERS Monitoring of Hydride Reduction Catalyzed by Multi-Branched Au Nanoparticles
Surface-enhanced Raman scattering(SERS)technology,as a highly promising molecular spec-troscopy technique,is leading the in-depth study of precious metal nanoparticles in catalytic chemical reac-tions.In particular,gold nanoparticles(AuNP)exhibit exceptional catalytic performance in hydrogenation reactions as catalysts.In this study,4-nitrothiophenol(4-NTP)molecules are chemically adsorbed onto the surface of AuNPs.By employing three different types of branched gold nanoparticles(short-branch nanostars,long-branch nanostars,and nano-raspberries),the efficient catalytic conversion of 4-nitrothio-phenol to 4-aminothiophenol(4-ATP)is achieved.SERS technology is used to monitor the reaction process,capture changes in molecular structure at the interface between the metal nanostars and the solu-tion,and study the kinetics of the Au nanoparticle interface reaction.The results indicate that the catalytic activity of AuNP is closely related to the sharpness of their tips and the number of branches.These find-ings provide valuable information for understanding and optimizing catalytic mechanisms at the molecular level.
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