Preparation Of Tungsten Oxide Nanomaterials And Its Application In SERS

Since Fleischmann et al.and Van Duyne et al.discovered the surface-enhanced Raman scattering(SERS)effect.SERS has become an extremely important analytical technique,and has been widely used in trace analysis,biological tissue imaging,monitoring catalytic reaction,and in other fields.Noble metal nanomaterials(such as Au and Ag)with strong localized surface plasmon resonance(LSPR)are the most common SERS substrates.However,the high price limits the large-scale application of Au-based SERS to a certain extent.Semiconductor substrates have attracted more and more attention due to their adjustable bandgap,nonmetallic LSPR,and low cost.Tungsten oxide is an important semiconductor material,which is widely used in the preparation of photocatalysts,electrochromic devices,gas sensors,and in other fields.In this paper,the photoelectric properties of tungsten oxide were studied by loading noble metal or introducing oxygen vacancy to make it have surface enhancement effect.1?Synthesis of Ag@WO3 nano-flowers and study on their surface-enhanced RamanWO3·H2O nanometer flower was synthesized by simple hydrothermal method,and WO3 was obtained by annealing at 400? for 2h.Then the silver nanoparticles were modified on the surface of WO3 by magnetron sputtering technology.The Ag@WO3 nanoflowers were characterized by XRD,ultraviolet-visible absorption,SEM and Raman spectrometers.The enhancement effect of Ag@WO3 on Raman spectrum of R6G was studied.2.Synthesis of WO3-x and study on its surface enhanced Raman performance.The oxygen-deficient WO3-x was synthesized by hydrothermal method.XRD,XPS and TEM were used to characterize the valence state and crystal shape of WO3-x,so as to confirm the successful synthesis of oxygen deficient WO3-x.The enhancement effect of WO3-x on Raman spectrum of R6G was studied.In this paper,some photoelectric properties of WO3 were changed by modifying precious metal particles on the surface of WO3 or introducing oxygen vacancy,which greatly improved its SERS performance.This method of manipulating semiconductor materials may be used to enhance the surface performance of other semiconductor substrates.