材料科学
纳米颗粒
化学工程
芯(光纤)
胶体金
壳体(结构)
粒子(生态学)
粒径
化学
纳米技术
分散性
复合材料
工程类
作者
Luis M. Liz-Marzán,and Michael Giersig,Paul Mulvaney
出处
期刊:Langmuir
[American Chemical Society]
日期:1996-09-04
卷期号:12 (18): 4329-4335
被引量:1638
摘要
Gold colloids have been homogeneously coated with silica using the silane coupling agent (3-aminopropyl)trimethoxysilane as a primer to render the gold surface vitreophilic. After the formation of a thin silica layer in aqueous solution, the particles can be transferred into ethanol for further growth using the Stober method. The thickness of the silica layer can be completely controlled, and (after surface modification) the particles can be transferred into practically any solvent. Varying the silica shell thickness and the refractive index of the solvent allows control over the optical properties of the dispersions. The optical spectra of the coated particles are in good agreement with calculations using Mie's theory for core−shell particles.
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