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| Effects of surface modification on dispersion of nano-CdS in polymers and their optical properties |
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| 中山大学材料科学研究所教育部聚合物复合材料及功能材料重点实验室 |
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Cite this article:
;. Effects of surface modification on dispersion of nano-CdS in polymers and their optical properties. Chin J Mater Res, 2004, 18(2): 130-138.
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Abstract A nano-sized CdS particles was incorporated into polymer films by solvent mixing, casting and evaporating methods. The CdS particles of about 6 nm in size were prepared through micro-emulsion and in-situ
surface modification with thiol and imidazole, respectively. It is proved that imidazole modification promotes the dispersion of these nanoparticles into PMMA, while thiol modified ones can be uniformly dispersed into PS matrix due to the selective solubility among the surface modifiers, solvents and polymers. The resultant polymer composites were characterized using optical, structural and thermal techniques. FTIR measurements revealed the formation of strong bonding between the particles and the polymer matrices. Besides the surface
modifier, the polymers also help to block the surface defects that trap the charge carriers, resulting in enhanced light absorption and emission behavior. On the other hand, in the presence of CdS particles, the
thermal decomposition temperatures of PMMA and PS shifted towards higher temperature region, further demonstrating the interaction between the particles and the polymers. The mechanisms accounting for the variation in the composites optical properties with CdS content and the amount of the surface modifiers were explained on the basis of the effects of surface modifier morphologies, dispersion status of the particles, and
the complex interaction among the particles, surface modifiers and polymers.
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Received: 21 May 2004
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