Direct Fabrication of Silica-Coated Gold Nanoparticles and Gold Nanoparticle-Deposited Silica Spheres in Aqueous Media

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  • SAKAI Toshio
    International Young Researchers Empowerment Center, Shinshu University
  • ENOMOTO Hiroto
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science
  • SAKAI Hideki
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science Research Institute for Science and Technology, Tokyo University of Science
  • ABE Masahiko
    Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science Research Institute for Science and Technology, Tokyo University of Science

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  • 水系におけるシリカ被覆金ナノ粒子・金ナノ粒子担持シリカ粒子の直接合成

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Direct coating of silica on naked-gold nanoparticles (AuNP@SiO2) and direct deposition of naked-gold nanoparticles on silica spheres (SiO2@AuNP) were achieved utilizing 3-mercaptopropyl trimethoxysilane (MPTMS) as in tandem a surface modifier and a silica precursor in an aqueous solution in the absence of any surface pre-treatment of the naked-AuNPs and SiO2 spheres using coupling agents and amphiphiles. The AuNP@SiO2 was prepared with the addition of an ammonia solution prior to a MPTMS aqueous solution into a naked-AuNP dispersion pre-prepared from sonochemical reduction of [AuCl4]− in an aqueous solution. We found that the addition of ammonia prior to MPTMS was critical for proper coating of SiO2 on the naked-AuNPs. Furthermore, the SiO2 shell thickness varied in the range of 40∼170 nm with the content of MPTMS that we applied in this experiment. Base condition (solution pH) was also an important factor for SiO2-coating on the naked-AuNPs. The SiO2@AuNP was formed from sonochemical reduction of [AuCl4]− in a SiO2 sphere dispersion pre-prepared from sol-gel reaction of MPTMS in an aqueous solution.

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