球形SiO2表面Ag纳米粒子生长及其拉曼增强效应

Preparation of SiO2/Ag Nanocomposite Material and Its Surface Enhanced Raman Scattering Property

摘要:

以聚乙烯吡咯烷酮 (PVP) 作为还原剂和稳定剂制备SiO2/Ag纳米复合材料，分析银氨络离子的浓度对银纳米粒子的影响，采用透射电镜(TEM)、扫描电镜(SEM)对SiO2/Ag复合材料进行表征，并研究以SiO2/Ag为基底的表面拉曼散射增强。结果表明，银纳米颗粒以多晶形式沉积在球形二氧化硅表面，通过调节银氨络离子的浓度可以改变Ag纳米颗粒的大小及其在SiO2上的沉积量；当银的沉积量增加时，表面拉曼散射也随之增强

Abstract:

SiO2/Ag composite material was synthesized with polyvinylpyrrolidone (PVP) as both the reductant and stabilizing agent. The particle size and quantity of silver nanoparticles on silica spheres could be changed with [Ag(NH3)2]+ ions of different concentrations. Transmission electron microscope (TEM) and scanning electron microscope (SEM) analysis were used to characterize the SiO2/Ag composite material. Results show that the silver is deposited on silica spheres as polycrystalline nanoparticles. Raman spectrometer measurement shows that surface enhanced Raman scattering (SERS) performance is improved by increasing the quantity of silver deposition on silica.