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Synthesis and Characterization of Water Soluble ZnS: Ce, Cu co-Doped Nanoparticles: Effect of Polyvinyl Alcohol Concentration

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Author Affiliations

  • 1 Department of Physics, Sri Venkateswara University, Tirupati, Andhra Pradesh, INDIA

Res. J. Physical Sci., Volume 1, Issue (7), Pages 7-10, August,4 (2013)

Abstract

ZnS nanoparticles co-doped with Ce3+ and Cu2+ ions were synthesized through a low cost chemical co- precipitation method using polyvinyl alcohol (PVA) as the capping agent. The prepared nanoparticles were characterized by X- ray diffraction (XRD), energy dispersive X – ray spectroscopy (EDS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV –visible and photoluminescence (PL) techniques. From X-ray diffraction studies it was observed that the synthesized nanoparticles have cubic Zinc blende structure with average sizes of about 2-4 nm and particle size decreases with increasing the capping agent concentration. EDS spectra confirmed the presence of corresponding elemental peaks and effective doping of the elements. Morphology and particle size distribution was analyzed by SEM and TEM. Optical absorption studies showed a blue shift in the absorption edge with increasing capping agent concentration and hence the effective band gap energy increases with decreasing the particle size. It was evident from photoluminescence studies that the emission becomes more intensive as the size of the particles is reduced with increasing capping agent concentration.

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