SYNTHESIS AND STRUCTURAL PROPERTIES OF WURTZITE TYPE CdS NANOPARTICLES

CdS semiconductor nanoparticles were synthesized by chemical precipitation method using cadmium chloride as cadmium source and sodium sulphide as sulphur source. Structural characterization of as synthesized semiconductor nanoparticles were performed by X-ray diffraction pattern (XRD) and Raman spectroscopy while optical characterization were done by Photoluminescence spectroscopy and UV-Visible absorption spectroscopy. XRD pattern showed the as synthesized CdS nanoparticles have wurtzite structure with 6-10 nm average crystallite size. Raman spectrum also confirmed the as synthesized sample was of CdS nanoparticles having first Longitudnal optical phonon (ILO) mode at 299 cm(-1) and 2LO at 601 cm(-1). UV-Visible absorption spectrum showed the blue shift in absorption edge w.r.t. bulk CdS. Photoluminescence study was performed to investigate the several defects and vacancy levels in the synthesized CdS nanopaerticles.