Structural and Electrical Properties of Cadmium Sulfide Nanoparticles: A Simple Chemical Route

Structural and electrical properties of the nanocrystalline cadmium sulfide (CdS) powder were effectively synthesized and annealed at 573 K, 673 K and 773 K. Cadmium sulfate and sodium sulfide was used as a starting precursor for the preparation of CdS nanoparticles. The XRD results confirmed that major phase of hexagonal structure-CdS along with partial oxidation of CdO and CdSO3 nanoparticles. It reveals that the average crystallite size varies from 25 to 41 nm as annealing temperature increases. The phase and functional group composition was studied through FTIR. The average particle size distribution of CdS nanoparticles is 39, 47, and 49 nm for 573, 673, and 773 K, respectively. The surface morphology of CdS particles revealed the compact crystalline structure. Electrochemical impedance spectroscopy studies showed that the charge transfer resistance is lowered as annealing temperature is increased.