One-step fabrication of gold nanoparticles-silica composites with enhanced catalytic activity

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• 作者：Kang Yeol Lee ; Young Wook Lee ; Kihyun Kwon ; Jinhwa Heo ; Jineun Kim ; Sang Woo Han
• 关键词：Genetic algorithm ; Steepest descent method ; Chaotic systems ; Neural network
• 刊名：Chemical Physics Letters
• 出版年：2008
• 期刊代码：7_00092614
• 类别：ph
• 出版时间：20 February 2008
• 卷：453
• 期：1-3
• 页码：77-81
• 文件大小：408 K

摘要

A fast and simple one-step method for the fabrication of stable gold nanoparticles-silica composites by using 1,4,7,10,13,16,21,24-octaazabicyclo[8.8.8]hexacosane(azacryptand) as a molecular anchor between nanoparticles and silica as well as reductant and stabilizer in the formation of the nanoparticles is reported. Gold nanoparticles-coated silica materials can be fabricated by mixing HAuCl₄ aqueous solution with the aqueous mixture of azacryptand and silica materials such as submicrometer silica particles and silica gel. The prepared nanoparticles-coated silica gel can effectively catalyze reduction of 4-nitrophenol by sodium borohydride in aqueous solution.