STRUCTURAL AND OPTICAL ANALYSIS OF CdS NANOCRYSTALS PREPARED BY LOW TEMPERATURE THERMOLYSIS

CdS nanoparticles were synthesized via low temperature thermolysis method using cadmium chloride and thiourea as cadmium and sulphur sources respectively. XRD analysis of nanocrystals prepared with three different synthesis times showed the crystalline nature, structure as well as particle size of the prepared CdS particles. From the peaks position of XRD spectra, the dependence of phase of CdS nanoparticles with the synthesis time has also been found. The absorption spectra enabled to visualize the blue shift in absorption onset. The bandgap of the prepared nanoparticles are found to be in the range 3.6-3.86eV. SEM, TEM and SAED images of CdS nanoparticles showed their morphology, particle size and crystallinity respectively. From the structural and SEM analysis it has been confirmed that phase change can be achieved by annealing the samples.