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Synthesis and Characterization of PVA capped CdS nanocrystals

Author Affiliations

  • 1 Department of Physics, Gauhati University, Guwahati-781014, Assam, INDIA

Res. J. Physical Sci., Volume 2, Issue (7), Pages 1-3, December,4 (2014)

Abstract

Cadmium sulphide (CdS) nanocrystals with Cd:S molar ratio of 0.2:0.2, 0.3:0.3, 0.4:0.4, 0.5:0.5 M are synthesized by chemical coprecipitation method using poly vinyl alcohol (PVA) as capping agent. Crystallite sizes of CdS nanocrystals are determined from XRD analysis. The crystallite sizes are found to be 3.34, 3.54, 3.75, 4.18 nm for molarity 0.2, 0.3, 0.4, 0.5 M respectively. The X-ray diffraction pattern study confirms that cubic phase cadmium sulphide nanocrystals are formed. From UV- visible spectra the band gap is found to be lying between 2.7-2.9 eV indicating a significant blue shift from its bulk of band gap energy 2.42 eV.

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