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纳米SiO2／Au复合粒子的制备及其性质表征

ISSN号：0258-7076
期刊名称：《稀有金属》
时间：0
分类：O614.123[理学—无机化学;理学—化学]
作者机构：[1]暨南大学纳米化学研究所,广东广州510632
相关基金：国家自然科学基金（20671042,50872045）和广东省自然科学基金团队项目（05200555）资助

关键词：纳米复合粒子, 核-壳粒子, 二氧化硅粒子, composite nanoparticles, core-shell particles, silica particles

中文摘要：

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Stoeber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100nm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SiO2／Au复合粒子表层光滑，完整，没有团聚现象。SiO2／Au-3的光学共振峰比SiO2／Au-1和SiO2／Au-2有红移。傅立叶红外光谱研究表明形成Si02／Au核一壳结构后，Si-O-Si和Si-OH的键会明显减弱。

英文摘要：

Gold nanolayer-encapsulated silica nanocomposite particles were synthesized by improved methods. Silica and gold nanoparticles were synthesized, respectively, through the Stoeber method and chemical reduction method. The particles showed a distribution of monodispersed spheroids, the size of particles was about 300 nm（SiO2） and 100 nm（Au） through SEM observation. The composite particles were characterized and investigated by transmission electron microscopy （ TEM）, UV-Visible-Near-IR ab-sorption spectra and FTIR. The results showed that the gold nanoshells of SiOJAu composite particles were smooth, integrity and no aggregation of sodium citrate and Potassium borohydride reduction. The absorption of SiO2/Au-3 in the optical resonance had red-shift compared with SiO2/Au-1 and SiO2/Au-2. Fourier transform infrared spectroscopy showed that Si- O-Si and Si-OH peaks would be reduced significantly when SiO2/Au formed.

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