INFLUENCE OF NICKEL ON STRUCTURAL AND OPTICAL BEHAVIOUR OF CADMIUM SULPHIDE NANOPARTICLES

Abstract

Cadmium Sulphide being an important II-VI compound semiconductor has wide applications in various optoelectronic and biolabeling devices. In the present work, undoped and Ni (2%, 4%, 6% and 8%) doped CdS nanoparticles were synthesized in aqueous medium by microwave assisted solvo thermal method using cadmium acetate, nickel chloride and sodium sulphide as precursors. The effect of Ni doping on the Structural, Morphological and Optical Properties of CdS nanoparticles have been studied by X- ray diffraction, SEM, FTIR, PL and UV-Visible spectroscopy. The crystal structure and morphology of the as synthesized nanoparticles have been investigated by X- ray diffraction and scanning electron microscopy (SEM). The XRD results revealed the crystalline nature of the nanoparticles. The average grain size of the nanoparticles was estimated using Scherrer equation which was found to be in the range of 4.2 - 6 nm. The FTIR spectra were also recorded to identify the presence of various functional groups in the synthesized CdS nanoparticles. For the estimation of the optical energy band gap of as synthesized nanoparticles, absorption spectra were recorded using UV- Visible spectrophotometer. The result of UV-Visible spectra revealed the increment of energy band gap in CdS nanoparticles on increasing the concentration of Ni.