Preparation And SERS Properties Of Semiconductor And Doped Semiconductors

Surface-enhanced Raman Scattering?SERS?spectroscopy has always been a very important analytical tool.However,SERS applications are limited due to lack of activity enhancing substrates.Therefore,the study of semiconductor materials as a SERS active substrate not only solves the problem of lack of SERS active substrate,but also promotes the research on SERS enhancement mechanism.Zirconium dioxide?ZrO₂?and different metal ion-doped zirconium dioxide?ZrO₂?nanoparticles were prepared by sol-gel method as the active substrate of SERS,and the enhancement mechanism was studied.Some innovative results were obtained.Below are key research findings:Preparation of ZrO₂ Nanoparticles by Sol-Gel Method and Its Application in SERSThis paper reports for the first time that sol-gel method is used to prepare ZrO₂nanoparticles with different sizes as SERS active substrates.By X-ray diffractometry?XRD?,Transmission electron microscopy?TEM?,Ultraviolet-visible diffuse reflectance spectroscopy?UV-Vis DRS?,Ultraviolet photoelectron spectroscopy?UPS?,Raman spectroscopy?Raman?,different sizes of synthesized The ZrO₂ nanoparticles were characterized.The results show that the particle sizes of ZrO₂ nanoparticles with different calcination temperatures were 8.1,10.5,11.1,15.5 and 17.6 nm,respectively,and the size of the nanoparticles was enhanced by SERS.The effect of different probe molecules?4-mercaptobenzoic acid?4-MBA?,tetradecylpyridine?4-MPY?,p-nonylphenol?PATP??adsorbed on the ZrO₂ semiconductor active substrate SERS,the charge transfer direction was determined by comparing the experimental test results with the Gaussian simulation.It was found that 4-MBA has the best SERS signal when it is adsorbed on a ZrO₂semiconductor active substrate having a calcination temperature of 500°C and a nanoparticle size of 10.5 nm.Preparation of Zn-doped ZrO₂ Nanoparticles and Its Application in SERSIn order to further explore the enhancement effect of ZrO₂ nanoparticles as SERS active substrates,the Zn-doped ZrO₂ nanoparticles synthesized in this paper were studied as SERS active substrates to study the effects of different doping Zn ions on ZrO₂ active substrates.It was found that an appropriate amount of doping concentration can promote SERS signal enhancement.The best SERS enhancement effect is obtained when the Zn ion doping amount is 1%compared to the pure ZrO₂ semiconductor active substrate.This is because the doping of Zn ions affects the surface defect concentration of ZrO₂,which in turn affects the SERS signal.3.Preparation of Fe-doped ZrO₂ Nanoparticles and Its Application in SERSIn order to further explore the enhancement effect of ZrO₂ nanoparticles as SERS active substrate,the Fe-doped ZrO₂ nanoparticles synthesized in this paper were studied as SERS active substrates in order to study the effect of different doping amounts of Fe ions on ZrO₂ active substrates.This paper finds that an appropriate amount of doping concentration can promote SERS signal enhancement.The best SERS enhancement is obtained when the Fe ion doping amount is 1%compared to the pure ZrO₂ semiconductor active substrate.This is because the doping of Fe ions affects the surface defect concentration of ZrO₂,which in turn affects the SERS signal.