硅表面沉积均匀的银纳米粒子阵列制备及其在非食用色素SERS特征图谱中的应用研究OACSTPCD

A ethanol-assisted chemical Ag plating technique was proposed in this paper to prepare a distribution of uniformly dispersed Ag nanoparticle arrays with an average particle size of 39 nm on a silicon wafer surface.Compared to conventional chemical Ag plating techniques,the introduction of high concentrations of ethanol in the Ag plating solution reduced the relative standard deviation of the Ag nanoparticle size from 60%to 28%.The prepared uniformly deposited Ag nanoparticle arrays exhibited the surface plasmon polariton effect and the strong surface enhanced Raman scattering(SERS)activity.Using Rhodamine 6G as the probing molecule,the Ag nanoparticle array SERS substrate demonstrated good reproducibility,with a relative standard deviation of the peak intensity of the strongest characteristic peak at 13.1%.Furthermore,based on the substrate of Ag nanoparticle arrays,the SERS fingerprint spectra of seven kinds of non-edible pigments,including Sudan Red I,Basic Orange Ⅱ,Acid Orange Ⅱ,Rose Red B,Basic Auramine O,Malachite Green,and Crystal Violet were established,the impact of different food matrices on the SERS spectra of the non-edible pigments above was tested.This study provides a new approach for the rapid identification of non-edible pigments in food.