STRUCTURAL AND OPTICAL CHARACTERIZATION OF PVA CAPPED CADMIUM SULPHIDE NANOPARTICLES BY CHEMICAL COPRECIPITATION METHOD

摘要

CdS nanoparticles have been synthesized by chemical co-precipitation method using PVA as a capping agent. Structural characterization of the as synthesized CdS nanoparticles were performed by X-ray diffraction (XRD) study which showed hexagonal structure with average crystallite size of 11 nm and lattice constants a=4.106 ?, c=6.637 ?. Optical characterization of nanocrystalline thin films prepared by Vacuum Evaporation Method from the synthesized powder were done by Photoluminescence spectroscopy and UVVisible absorption spectroscopy. UV-Visible absorption spectrum showed blue shift in absorption edge with respect to bulk CdS. The photoluminescence spectrum of the CdS film exhibited green emission band with a maximum at 528 nm. Radius of the synthesized CdS nanoparticle has been evaluated from the absorption spectrum by using the effective mass approximation formula.