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Proceedings Paper

Sol-gel preparation of metal particle/oxide nanocomposites
Author(s): Sumio Sakka; Hiromitsu Kozuka; Gaoling Zhao
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Paper Abstract

Noble metal nanoparticle-dispersed SiO2 and TiO2 coating films were prepared by heating in air or in reducing atmosphere the gel films obtained from homogeneous solutions of corresponding noble metal salts and silicon or titanium alkoxides. In the Au particle-dispersed SiO2 coating films obtained from solutions of HAuCl4 (DOT) 4H2O and Si(OC2H5)4, the size and shape of the Au particles were markedly affected by the sol aging time, the amount of H2O for Si(OC2H5)4 hydrolysis and the exposure of the gel film to an amine vapor prior to heat-treatment. This suggests the strong relation between the structure and nature of the gel matrix and the final microstructure of the composite films. In the dielectric matrix of TiO2 with high refractive index the surface plasma resonance peak of Au particles was at longer wavelengths than in SiO2 matrix as predicted by Mie theory. Pt/TiO2, Pd/TiO2 and Ag/TiO2 nanocomposite films exhibited optical absorption in the visible range due to the high dielectric constant of the matrix.

Paper Details

Date Published: 13 October 1994
PDF: 12 pages
Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); doi: 10.1117/12.188941
Show Author Affiliations
Sumio Sakka, Kyoto Univ. (Japan)
Hiromitsu Kozuka, Kyoto Univ. (Japan)
Gaoling Zhao, Kyoto Univ. (Japan)

Published in SPIE Proceedings Vol. 2288:
Sol-Gel Optics III
John D. Mackenzie, Editor(s)

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