Synthesis and optical properties of nanocomposite based on CdS nanoparticles in a silicon oxide matrix

The CdS-based nanocomposite was synthesized by the sol-gel method at room temperature using water alkaline solution of sodium silicates, or liquid glass, for the first time. An average diameter of nanoparticles varies from 3 to 10 nm depending on synthesis conditions. It was demonstrated using the methods of spectrophotometry and luminescence in the UV, visible and NIR optical ranges that optical properties of the nanocomposite significantly depend on the presence of water molecules near the particle surface. Replacing of water matrix to silica oxide based matrix has led increasing the luminescence intensity and changing of recombination processes participating in the emission.