期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 283, 期 2, 页码 392-396出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2004.08.184
关键词
silver nanoparticle; silica; sol-gel; coating; Stober method; seeded polymerization; core-shell; surface plasmon resonance; Mie theory
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.
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