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

Abstract

Poly(vinylpyrrolidone) stabilized cadmium sulfide (CdS) nanoparticles were loaded onto thesurface of silica (SiO2) nanoparticles by using γ-irradiation. TEM micrograph reveals the presence of ~20nm sized CdS nanoparticles on the surface of SiO2 nanoparticles. XRD patterns confirm the crystalline.PL spectra of the simple PVP-stabilized CdS nanoparticle and SiO2@CdS composite confirm the diferencesin the emission characteristics between them. Two prominent emission peaks were noted around 550 nmand 60 nm for PVP-stabilized CdS nanoparticles). The emission peaks noted for the PVP-stabilized CdSnanoparticles were found to be blue shifted for SiO2@CdS composites. Besides, an additional emissionpeak around 450 nm was noticed for the SiO2@CdS composite. The presence of CdS nanoparticlesinfluence the emission characteristics and induce quantum confinement effect.