Effects of nanosized metallic palladium loading and calcination on characteristics of composite silica
(1. Faculty of Materials science and Engineering,
Hefei University of Technology, Hefei 230009, China;
2. Institute of Solid State Physics, Chinese Academy of Sciences,
Hefei 230031, China)
Hefei University of Technology, Hefei 230009, China;
2. Institute of Solid State Physics, Chinese Academy of Sciences,
Hefei 230031, China)
Abstract: In order to investigate the effects of nanosized metallic palladium loading and calcination on the characteristics of composite silica, the silica was prepared by sol-gel technique, leading to an amorphous solid with mesoporosity, and the pore size distribution is narrow, centered at 3-5nm. The composite silica was formed by impregnating palladium precursor into the porous network with sequel calcination in hydrogen. The results show that the nanosized palladium as guest phase in the composite silica is subjected to the mesoporous structure and calcination, resulting in the changes of optical adsorption that red-shifted to higher wavelength with the palladium loading and the heating temperature. The tailoring of the optical properties can be ascribed to the effect of the nanosized metal particles and interactions occurred between palladium and silica.
Key words: nanosized palladium; silica host; nanocomposites; calcination