Optical properties of core/shell typed PMMA/CdS nanoparticles prepared by in situ and ex situ surfactant-free emulsion polymerization

被引：0
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作者：
Hyojung Yoon
Young-Mok Rhym
Sang Eun Shim
机构：
[1] Inha University,Department of Chemical Engineering
[2] Korea Institute of Materials Science,undefined
来源：
Colloid and Polymer Science | 2011年 / 289卷
关键词：
PMMA; CdS; Nanoparticles; Quantum dots; Band-gap energy;
D O I：
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学科分类号：
摘要：
Core/shell poly(methyl methacrylate)/cadmium sulfide (PMMA/CdS) nanoparticles were prepared by surfactant-free emulsion copolymerization with 2-(dimethylamino)ethyl methacrylate (DMAEMA) auxiliary monomer. According to the addition time of Cd2+ ions, the synthesis of the hybrid nanoparticles was conducted in in situ and ex situ techniques. The core/shell PMMA/CdS nanoparticles synthesized by the post-addition (ex situ) of Cd2+ ions showed a wide size distribution and interference fringes in the photoluminescence (PL) spectrum. However, these results were improved when the PMMA/CdS nanoparticles were synthesized in the presence of Cd2+ ions (in situ method). The in situ method made it possible to obtain monodisperse hybrid nanoparticles and fairly narrow band-gap emission.
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