Preparation of gold-silica heterogeneous nanocomposite particles by alcohol-reduction method
- 作者：Tae-Hyun Kim ; Dae-Wook Kim ; Jong-Min Lee ; Yong-Geun Lee ; Seong-Geun Oh
- 关键词：A. Composites ; A. Metals ; A. Nanostructures ; B. Chemical synthesis ; D. Surface properties
- 刊名：Materials Research Bulletin
- 出版年：2008
- 期刊代码：60_00255408
- 类别：ms
- 出版时间：6 May 2008
- 卷：43
- 期：5
- 页码：1126-1134
- 文件大小：802 K
摘要
Au-silica heterogeneous nanocomposite particles were prepared by novel preparation strategy involving alcohol-reduction method using 3-aminopropyltrimethoxysilane (APTMS) as a binder between silica surface and Au nanoparticles, and using PVP as a stabilizer for Au nanoparticles. The evolution of morphology of composite particles was investigated with increasing reaction time at different Au precursor concentrations of 100 ppm and 250 ppm using UV–vis spectrophotometer and TEM. It is shown that the size of immobilized Au particles on silica surface can be controlled with the variation of reaction rate via adjusting Au precursor concentration and reaction time, but the high concentration of Au precursor hinders the immobilization of well-defined Au nanoparticles due to the slow reduction rate of Au precursor. On the basis of experimental results, the role of APTMS and PVP on the formation of composite particles and the effect of Au precursor concentration on the morphological evolution of composite particles are briefly discussed.