Copolymer nanosphere encapsulated CdS quantum dots prepared by RAFT copolymerization: synthesis,characterization and mechanism of formation |
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Authors: | Paramita Das Weiheng Zhong Jerome P Claverie |
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Institution: | (1) NanoQAM, Department of Chemistry, University of Quebec at Montreal, Succ Centre Ville CP8888, Montreal, H3C 3P8, Quebec, Canada; |
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Abstract: | Cadmium sulfide (CdS) quantum dots (QDs) encapsulated in block copolymer spheres were synthesized by an aqueous emulsion polymerization
process. First, stable dispersions of CdS QDs in water were prepared using a polymer dispersant, either poly(acrylic acid)
or a random copolymer having an average of ten acrylic acid and five butyl acrylate units. These polymer dispersants were
prepared by reversible addition-fragmentation chain transfer polymerization. Then, the CdS QDs dispersed in water were encapsulated
in a polystyrene shell using an emulsion polymerization process. Spectroscopic and microscopic techniques were used to characterize
the resulting nanocomposites. Optical properties of QDs in polymer microspheres were investigated by UV-vis and fluorescence
spectroscopic studies. Particle sizes of all CdS QD samples were calculated from absorption edges using Henglein's empirical
curve. Transmission electron microscopy was used to determine the size and morphology of CdS QD samples. These observations
were used to elucidate the mechanism of formation of the resulting well-defined polymer-encapsulated CdS nanoparticles. |
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