Journal of South China University of Technology (Natural Science Edition) ›› 2009, Vol. 37 ›› Issue (3): 1-5.

• Materials Science & Technology •     Next Articles

Fluorescence Spectra of Zinc Sulfide Quantum Dots/Polyurethane Nano-Composite

Li Guang-ji1  Huang Yu-gang1  Zhu Zu-zhao2  Luo Wei-ang2  Chen Xu-dong2   

  1. 1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, Guangdong, China
  • Received:2008-03-13 Revised:2008-10-03 Online:2009-03-25 Published:2009-03-25
  • Contact: 陈旭东（1966-），男，教授，主要从事聚合物光谱特性的研究．E-mail：cescxd@sysu．edu．cn E-mail:gjli@scut．edu．cn
  • About author:李光吉（1959－），女，教授，主要从事聚合物基纳米复合材料的研究．
  • Supported by:

    广东省科技攻关项目（20078010600046）

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Abstract:

ZnS quantum dots （QDs） sol surface-modified by mercaptopropionic acid （MPA） was prepared via the aqueous-phase method, and ZnS QDs/polyurethane nano-composite membrane was prepared via film casting. Then, ZnS QDs and the prepared nano-composite membrane were characterized by UV-Vis absorption spectra and fluorescence spectra. UV-Vis absorption spectra show that the size of ZnS QDs, which is 3.0nm at the reflux temperature of 70 ℃ according to the Brus model, keeps unchanged after the purification. Fluorescence spectra show that the increase of reflux temperature results in a great improvement of fluorescence intensity of ZnS QDs, that the emission band of ZnS QDs in water at about 400 nm attributes to the trapped emission arising from the radiative recombination of the trapped carriers caused by the Zn vacancies on QDs surface, and that the emission band of ZnS QDs after the recombination exhibits a redshift from 400 nm to 425 nm.

Key words: Znic sulfide, quantum dot, polyurethane, composite, fluorescence spectrum