Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 96, Issue 2-3, Pages 489-493Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2005.07.040
Keywords
silver nanoparticles; plasma resonance; silica-silver core-shell sphere; optical properties
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Silver nanoparticles of 20 and 70 nm, respectively, were deposited on the surfaces of submicron silica spheres. Plasma resonances of the submicron silica spheres with dense and uniform silver layer were investigated using UV/vis absorption spectra. It was found that the silver plasma resonance band of the silica-silver core-shell spheres was broadened and shifted to longer wavelength several hundreds nanometers. The dipole-dipole interactions of neighboring silver particles and Mie scattering of silver shell as a whole may serve as the mechanism of such shift and broadening. (c) 2005 Elsevier B.V. All rights reserved.
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