期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 264, 期 2, 页码 385-390出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/S0021-9797(03)00422-3
关键词
gold; nanoparticle; silica; sol-gel; coating; Stober method; seeded polymerization; core-shell; surface plasmon resonance; Mie theory
Gold nanoparticles prepared through a conventional citrate-reduction method were directly coated with silica by means of a seeded polymerization technique based on the Stober method. The method required no surface modification. The addition of tetraethylorthosilicate and water prior to ammonia was found to be critical to obtain a proper coating. The silica shell thickness was varied from 30 to 90 nm for TEOS concentrations of 0.0005-0.02 M at 10.9 M of water and 0.4 M of ammonia. The optical spectra of the core-shell gold-silica composite particles agreed with predictions of Mie theory. (C) 2003 Elsevier Inc. All rights reserved.
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