Novel method to fabricate SiO2/Ag composite spheres and their catalytic, surface-enhanced Raman scattering properties

被引：235

作者：

Deng, Ziwei

Chen, Min

Wu, Limin ^{[1
]}

机构：

[1] Fudan Univ, Dept Mat Sci, Shanghai 200433, Peoples R China

[2] Fudan Univ, Adv Coatings Res Ctr, China Educ Minist, Adv Mat Lab, Shanghai 200433, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2007年 / 111卷 / 31期

关键词：

D O I：

10.1021/jp073632h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This paper presents a novel method for the fabrication of SiO2/Ag composite spheres with the aid of the reducing and stabilizing function of polyvinylpyrrolidone (PVP). In this approach, [Ag(NH3)(2)](+) ions were first adsorbed on the surfaces of silica spheres via electrostatic attraction between the silanol groups and ions; these [Ag(NH3)(2)](+) ions adsorbed on silica spheres were then reduced and protected by PVP to obtain SiO2/Ag composite spheres. Neither additional reducing agent nor core surface modification was needed; the particle size and the coverage degree of silver nanoparticles on the silica spheres could be easily tuned by altering the concentration of the precursor-[Ag(NH3)(2)](+) ions. UV-visible spectrometer analysis showed these composite spheres had very good catalytic property; Raman spectrometer measurement showed that these composite spheres exhibited excellent surface-enhanced Raman scattering (SERS) performance.

引用

页码：11692 / 11698

页数：7

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