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Journal of Nanomaterials
Volume 2012 (2012), Article ID 451506, 8 pages
http://dx.doi.org/10.1155/2012/451506
Research Article

CdS Nanoparticles with a Thermoresponsive Polymer: Synthesis and Properties

King Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11451, Saudi Arabia

Received 6 February 2012; Accepted 16 April 2012

Academic Editor: Anukorn Phuruangrat

Copyright © 2012 Aslam Khan. 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

This paper describes the synthesis of thermoresponsive colloidal nanocomposites based on CdS and poly(N-isopropylacrylamide). The CdS nanoparticles were prepared at room temperature from cadmium chloride and sodium sulfide salts in the presence of an organic ligand, 3-mercaptopropionic acid (MPA). The as-prepared MPA-bound CdS nanoparticles were stable for more than 30 days and exhibited good optical properties. The effect of various ratios of MPA/Cd2+ and H2O/DMF (dimethylformamide) on the particle size of the CdS nanoparticles was investigated using UV-vis absorption measurements. Transmission electron microscopy studies showed that the particle sizes were approximately 4 nm in diameter, which is consistent with the size obtained using UV-vis spectroscopy. The CdS nanocomposite showed a temperature-responsive phenomenon as its temperature increased from 20 to 45°C.