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Journal of Nanomaterials
Volume 2011, Article ID 514205, 6 pages
http://dx.doi.org/10.1155/2011/514205
Research Article

Aqueous Synthesis and Characterization of CdSe/ZnO Core-Shell Nanoparticles

1Department of Chemistry, Vaal University of Technology, Private Bag X021, Vanderbijlpark 1900, South Africa
2Department of Chemical Technology, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, South Africa

Received 24 June 2011; Accepted 24 August 2011

Academic Editor: Anukorn Phuruangrat

Copyright © 2011 B. P. Rakgalakane and M. J. Moloto. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Core-shell nanomaterials based on CdSe as the core and ZnO as the shell were prepared using an aqueous route involving the use of Cd salt and NaBH4 in reaction with Se to generate CdSe in the presence of thioglycerol (TG) as a stabilizer. ZnO has been prepared at pH 12 using stronger base such as NaOH at lower concentration and by varying amounts of Zn2+ ions ranging from 2.5, 5, 25 mL, and 50 mL to prepare core-shell nanomaterials. The absorption and emission spectral features are dominated by CdSe nanoparticles with typical shift in the emission maxima red-shifted in relation to the band edges. There is an observable change in the band edge from the core as the amount of ZnO is increased. The TEM features showed the formation of the core-shell from the volume of 5 mL which is indicated by the thin layer of shell on the surface of the CdSe core.