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http://dx.doi.org/10.17702/jai.2012.13.4.188

Characterization of Core/Shell PMMA/CdS Nanoparticles Synthesized by Surfactant-free Emulsion Polymerization  

Yoon, Hyojung (Department of Chemical Engineering, Inha University)
Rhym, Young-Mok (Korea Institute of Materials Science)
Shim, Sang Eun (Department of Chemical Engineering, Inha University)
Publication Information
Journal of Adhesion and Interface / v.13, no.4, 2012 , pp. 188-192 More about this Journal
Abstract
Herein, CdS-coated PMMA nanoparticles were prepared by in-situ surfactant-free emulsion copolymerization and subsequent CdS coating process. As-prepared CdS/PMMA hybrid particles had 201.7 nm in diameter. The amount of CdS nanocrystals in the hybrid particles was 10.37 wt% determined by TGA and elemental analysis. The size of CdS crystals was 3.55 nm preferentially grown in (111) plane. UV-vis spectrum of PMMA/CdS nanoparticles showed the significant blue-shift in optical illumination. The reason was found because the synthesized CdS nanocrystals on PMMA particles had a different band gap energy of 2.70 eV which was significantly higher than that of known-value of bulk CdS (2.41 eV) due to a quantum confinement effect.
Keywords
CdS; PMMA; core/shell; nanoparticles; surfactant-free emulsion polymerization; characterization;
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