Abstract
Optical extinction of Ormosils (Organically Modified Silicates) with colloidal Au and Pt particles was studied by the absorption spectroscopy in the visible range. Both bulk and thin film forms of the metal-Ormosil nanocomposites were prepared and analyzed. The correlation between the nanocomposites' resonance absorption position with particle size and volume fraction of the colloidal metal particle was investigated and discussed. No third order nonlinear optical response was detected in the nanosecond time scale. The metal particle size and size distribution was studied by the transmission electron microscopy. X-ray analysis showed the metal particles to be crystalline with FCC structure. The metal clusters were incorporated into the Ormosil matrices by dissolving metal salts into the Ormosil precursor solution prior to gelatin. Reduction of the metal ions within the Ormosil matrices was achieved either by the thermal treatment or by UV irradiation of the samples.
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