Silica coating of silver nanoparticles using a modified Stober method
Silica coating of silver nanoparticles using a modified Stober method
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DOI：
10.1016/j.jcis.2004.08.184
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发表时间：
2005-03-15
影响因子：
9.9
通讯作者：
Liz-Marzán, LM
中科院分区：
文献类型：
--
作者：
Kobayashi, Y;Katakami, H;Liz-Marzán, LM
通过硼氢化物还原法制备的银纳米粒子，通过基于 Stober 方法的种子聚合技术直接涂覆二氧化硅。使用各种胺催化剂来初始化 TEOS 的溶胶-凝胶反应，无需事先进行表面改性。发现使用二甲胺（DMA）作为催化剂对于获得合适的涂层是必要的。当 TEOS 浓度为 1-15 mM、11.1 M 水和 0.8 M DMA 时，二氧化硅壳厚度为 28 至 76 nm。核壳银二氧化硅复合颗粒的光谱显示与米氏理论的预测定性一致。 (C) 2004 Elsevier Inc. 保留所有权利。
Silver nanoparticles prepared through a borohydride-reduction method were directly coated with silica by means of a seeded polymerization technique based on the Stober method. Various amine catalysts were used for initialization of a sol-gel reaction of TEOS with no need for a prior surface modification. Use of dimethylamine (DMA) as a catalyst was found to be necessary to obtain a proper coating. The silica shell thickness was varied from 28 to 76 nm for TEOS concentrations of 1-15 mM at 11.1 M water and 0.8 M DMA. The optical spectra of the core-shell silver-silica composite particles show a qualitative agreement with predictions by Mie theory. (C) 2004 Elsevier Inc. All rights reserved.