纳米SiO_2/Au复合粒子的制备及其性质表征

通过改进的方法制备了金壳包覆二氧化硅纳米复合粒子. 二氧化硅和金纳米粒子分别通过Stober法和化学还原法制备. SEM分析表明, 都呈现出单分散的球状分布, 粒径为300和100 nm左右. 制备的纳米复合粒子通过TEM, UV-Vis-Near-IR, FTIR来表征和研究, 结果表明结合柠檬酸钠与硼氢化钾还原法制备所得到的SiO_2/Au复合粒子表层光滑, 完整, 没有团聚现象. SiO_2/Au-3的光学共振峰比SiO_2/Au-1和SiO_2/Au-2有红移. 傅立叶红外光谱研究表明形成SiO_2/Au核-壳结构后, Si-O-Si和Si-OH的键会明显减弱.

Preparation and Characterization of SiO_2/Au Nano-Composite Particles

Gold nanolayer-encapsulated silica nano-composite particles were synthesized by improved methods. Silica and gold nanoparticles were synthesized, respectively, through the Stber method and chemical reduction method. The particles showed a distribution of monodispersed spheroids, the size of particles was about 300 nm(SiO_2) and 100 nm(Au) through SEM observation. The composite particles were characterized and investigated by transmission electron microscopy (TEM), UV-Visible-Near-IR absorption spectra and FTIR. The results showed that the gold nanoshells of SiO_2/Au composite particles were smooth, integrity and no aggregation of sodium citrate and Potassium borohydride reduction. The absorption of SiO_2/Au-3 in the optical resonance had red-shift compared with SiO_2/Au-1 and SiO_2/Au-2. Fourier transform infrared spectroscopy showed that Si-O-Si and Si-OH peaks would be reduced significantly when SiO_2/Au formed.