胶体
材料科学
纳米颗粒
折射率
溶剂
化学工程
图层(电子)
胶体二氧化硅
芯(光纤)
硅烷
水溶液
胶体金
壳体(结构)
表面改性
化学
高分子化学
纳米技术
复合材料
有机化学
涂层
光电子学
工程类
作者
Luis M. Liz‐Marzán,Michael Giersig,Paul Mulvaney
出处
期刊:Langmuir
[American Chemical Society]
日期:1996-01-01
卷期号:12 (18): 4329-4335
被引量:1742
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 Stöber 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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