Abstract
Synthesis and characterization of nanocrystalline materials has become an active field of research in recent years because of novel physical properties expected of such systems. Electrodeposition technique has been used to grow nanometer sized silver particles in a melt -quenched silica glass and nanosized copper particles in a silica gel, respectively. The particle sizes vary in the range of 3.1 to 12.0 nm. depending on the precursor composition and the applied voltage. The growth in both the media have been found to be fractal in nature with the fractal dimension having values in the range of 1.75 to 2.0. These results have been explained in the chapter by generalized diffusion limited aggregation model . The electrical resistivity in some of the specimens is controlled by an electron tunneling mechanism. The optical absorption spectra of the copper- silica nanocomposite are explained by Mie theory.
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