首页 | 本学科首页   官方微博 | 高级检索  
     


Polystyrene-co-maleic acid/CdS nanocomposites: Preparation and properties
Authors:P. Sreekumari Nair  T. Radhakrishnan  N. Revaprasadu  A.S. Luyt
Affiliation:a Department of Chemistry, University of Zululand, Private Bag X1001, Kwa Dlangezwa 3886, South Africa
b Department of Chemistry, University of the Free State (Qwa-Qwa Campus), Private Bag X13, Phuthaditjhaba 9866, South Africa
c Institut of Nuclear Sciences “Vin?a”, P.O. Box 522, 11001 Belgrade Serbia and Montenegro
Abstract:
Composites of CdS nanoparticles confined in a polystyrene-co-maleic acid (PS-co-MAc) matrix have been prepared and characterized. It was shown that the acid groups of the co-polymer could be successfully used to control the aggregation of the nanoparticles, because they act as coordinate sites for Cd ions. UV-VIS measurements showed a blue shift of the absorption threshold, proving the presence of nanoparticles. An average size of the nanoparticles of about 4 nm is estimated from the change in band gap energy. Although the FTIR spectrum of the nanocomposite showed the presence of C-S bonds, a broad emission originating from surface recombination sites are noticed. DSC and TGA measurements revealed changes in thermal properties upon incorporation of nanoparticles. No thermal transition was observed in the nanocomposite, while the pure co-polymer exhibits a glass transition at 190 °C. In the presence of nanoparticles the onset of the thermal decomposition of the matrix is also shifted by 50 °C towards a higher temperature.
Keywords:A. Nanostructures   B. Chemical synthesis   C. Infrared spectroscopy   C. Differential scanning calorimetry (DSC)   D. Optical properties
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号