STUDY OF STRUCTURAL, MORPHOLOGICAL AND OPTICAL PROPERTIES OF Cu AND Ni DOPED CdS NANOPARTICLES PREPARED BY MICROWAVE ASSISTED SOLVO THERMAL METHOD

[摘要] CdS is one of the important II-VI compound semiconductors having wide applications in various optoelectronic devices. It has also proved to be a promising material for solar cell and biolabeling applications. The present work reports the synthesis of undoped and transition metal (Cu and Ni) doped CdS nanoparticles. The synthesis of pure and doped CdS nanoparticles have been carried out in aqueous medium by microwave assisted solvo thermal method using cadmium acetate, nickel chloride, copper chloride and sodium sulphide as precursors. The study of structural, morphological and optical properties was done by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Photoluminescence (PL), Fourier Transform Infrared (FTIR) and UV-Visible spectroscopy. The crystal structure and morphology of the as synthesized nanoparticles have been studied by X- ray diffraction and scanning electron microscopy. The XRD spectrum confirms the crystallanity of the samples. The size of the nanocrystallites was calculated using Debye-Scherrer formula. The average crystallite size was found to be around 8 nm for undoped CdS and it was around 4.5 nm for Cu doped CdS and 4.0 nm for Ni doped CdS nanoparticles. For the determination of the different functional groups present on the surface of the synthesized nanoparticles, FTIR spectra were also recorded. The absorption spectra were recorded using UV-Visible spectrophotometer. The energy band gap of as synthesized nanoparticles was estimated usingTauc plot.The result of UV-Visible spectra shows that the band gap of doped CdS increases as compared to that of pure CdS, clearly indicating the blue shift of the bandgap values from the bulk CdS.

[学科分类] 生物技术

[关键词] Cu and Ni doped CdS nanoparticles;XRD;SEM;FTIR;UV-visible