2012•Unpublished venueRequires access

STRUCTURAL AND OPTICAL CHARACTERIZATION OF PVA CAPPED CADMIUM SULPHIDE NANOPARTICLES BY CHEMICAL COPRECIPITATION METHOD

L. Sujata Devi, K. Nomita Devi, B. Indrajit Sharma, H. N. K. Sarma

Abstract

CdS nanoparticles have been synthesized by chemical co-precipitation method using PVA as a capping agent. Structural characterization of the as synthesized CdS nanoparticles were performed by X-ray diffraction (XRD) study which showed hexagonal structure with average crystallite size of 11 nm and lattice constants a=4.106 A, c=6.637 A. Optical characterization of nanocrystalline thin films prepared by Vacuum Evaporation Method from the synthesized powder were done by Photoluminescence spectroscopy and UVVisible absorption spectroscopy. UV-Visible absorption spectrum showed blue shift in absorption edge with respect to bulk CdS. The photoluminescence spectrum of the CdS film exhibited green emission band with a maximum at 528 nm. Radius of the synthesized CdS nanoparticle has been evaluated from the absorption spectrum by using the effective mass approximation formula.

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Available abstract

Key concepts: Photoluminescence, Nanocrystalline material, Materials science, Coprecipitation, Nanoparticle, Absorption spectroscopy, Crystallite, Analytical Chemistry (journal)