Sol-gel preparation of metal particle/oxide nanocomposites

Sumio Sakka; Hiromitsu Kozuka; Gaoling Zhao

doi:10.1117/12.188941

13 October 1994 Sol-gel preparation of metal particle/oxide nanocomposites

Sumio Sakka, Hiromitsu Kozuka, Gaoling Zhao

Proceedings Volume 2288, Sol-Gel Optics III; (1994) https://doi.org/10.1117/12.188941
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

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.

Citation Download Citation

Sumio Sakka, Hiromitsu Kozuka, and Gaoling Zhao "Sol-gel preparation of metal particle/oxide nanocomposites", Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); https://doi.org/10.1117/12.188941

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