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http://dx.doi.org/10.5806/AST.2007.20.5.413

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

Kang, Yun-Ok (Department of Chemistry, BK 21 NanoBiosensor Research Team, Hannam University)
Choi, Seong-Ho (Department of Chemistry, BK 21 NanoBiosensor Research Team, Hannam University)
Gopalan, A. (Department of Chemistry Graduate School, Kyungpook National University)
Lee, Kwang-Pill (Department of Chemistry Graduate School, Kyungpook National University)
Publication Information
Analytical Science and Technology / v.20, no.5, 2007 , pp. 413-418 More about this Journal
Abstract
Poly(vinylpyrrolidone) stabilized cadmium sulfide (CdS) nanoparticles were loaded onto the surface of silica ($SiO_2$) nanoparticles by using ${\gamma}$-irradiation. TEM micrograph reveals the presence of ~20nm sized CdS nanoparticles on the surface of $SiO_2$ nanoparticles. XRD patterns confirm the crystalline. PL spectra of the simple PVP-stabilized CdS nanoparticle and $SiO_2$@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 $SiO_2$@CdS composites. Besides, an additional emission peak around 450 nm was noticed for the $SiO_2$@CdS composite. The presence of CdS nanoparticles influence the emission characteristics and induce quantum confinement effect.
Keywords
CdS nanoparticle; ${\gamma}$-Irradiation; Silica nanoparticle; $SiO_2$@CdS; Emission spectra;
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