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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

Preparation and characterization of CdS nanoparticle on the surface of silica nanoparticles

Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2007, v.20 no.5, pp.413-418



A.Gopalan
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Abstract

Poly(vinylpyrrolidone) stabilized cadmium sulfide (CdS) nanoparticles were loaded onto the surface of silica (<TEX>$SiO_2$</TEX>) nanoparticles by using <TEX>${\gamma}$</TEX>-irradiation. TEM micrograph reveals the presence of ~20nm sized CdS nanoparticles on the surface of <TEX>$SiO_2$</TEX> nanoparticles. XRD patterns confirm the crystalline. PL spectra of the simple PVP-stabilized CdS nanoparticle and <TEX>$SiO_2$</TEX>@CdS composite confirm the differences in the emission characteristics between them. Two prominent emission peaks were noted around 550 nm and 600 nm for PVP-stabilized CdS nanoparticles). The emission peaks noted for the PVP-stabilized CdS nanoparticles were found to be blue shifted for <TEX>$SiO_2$</TEX>@CdS composites. Besides, an additional emission peak around 450 nm was noticed for the <TEX>$SiO_2$</TEX>@CdS composite. The presence of CdS nanoparticles influence the emission characteristics and induce quantum confinement effect.

keywords
CdS nanoparticle, <TEX>${\gamma}$</TEX>-Irradiation, Silica nanoparticle, <TEX>$SiO_2$</TEX>@CdS, Emission spectra


Reference

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Klug, (1974) X-ray diffractionprocedure for polycrystalline and amorphous materialsWiley,

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