Performance Optimization And Application Of Trace Detection Of Noble Metal Nanocomposites

Surface enhanced Raman spectroscopy(SERS)is a promising research tool with ultrahigh surface sensitivity,which can be used for the study of individual molecules.Among the three most commonly used SERS noble metal substrates(Ag,Au),the surface plasma efficiency of Ag was higher than that of Au.In this paper,the advantages of noble metal nanocomposites as SERS substrate were utilized to optimize the structural properties of the composites and apply in organic matter degradation and biomass detection.First,HA/Ag nanocomposites with porous structure were prepared by using a pot of hot sol method and used as SERS substrate to detect their activities as a SERS substrate.Rhodamine B Raman signals were detected,proving that HA/Ag nanocomposites had high activities as a SERS substrate and high sensitivity to Rhodamine B detection.HA/Ag nanocomposites were used as catalysts to further demonstrate their excellent catalytic properties for the degradation of organic compounds.Furthermore,the core-shell structure Au@Ag NPs was synthesized by seed growth.At the same p H,Au@Ag NPs not only exhibited peroxidase-like activities,but also GOx-like activities.Therefore,Au@Ag NPs can be called "tandem enzyme".In addition,the advantage of tandem enzyme-like activities can be maximized at p H 4.0 and 60?.On this basis,a SERS strategy without label,without natural enzyme and one-pot method was developed to detect glucose.