华南理工大学学报(自然科学版) ›› 2009, Vol. 37 ›› Issue (3): 1-5.

• 材料科学与技术 •    下一篇

ZnS量子点/聚氨酯纳米复合材料的荧光光谱

李光吉黄玉刚1  朱祖钊罗伟昂2  陈旭东2   

  1. 1. 华南理工大学 材料科学与工程学院, 广东 广州 510640; 2. 中山大学 化学与化学工程学院, 广东 广州 510275
  • 收稿日期:2008-03-13 修回日期:2008-10-03 出版日期:2009-03-25 发布日期:2009-03-25
  • 通信作者: 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
  • 作者简介:李光吉(1959-),女,教授,主要从事聚合物基纳米复合材料的研究.
  • 基金资助:

    广东省科技攻关项目(20078010600046)

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)

摘要: 采用水相法制备了经巯基丙酸表面改性的ZnS量子点溶胶,再利用铸膜法得到了ZnS量子点/聚氨酯纳米复合膜.通过紫外吸收光谱和荧光光谱等方法对制得的ZnS量子点及ZnS量子点/聚氨酯纳米复合膜进行了分析表征.紫外吸收光谱表明,纯化前后ZnS量子点的尺寸没有变化,根据Brus模型可知,70℃下回流得到的ZnS量子点的尺寸为3.0 nm.荧光光谱表明:提高回流温度可显著提高ZnS量子点的发光强度;ZnS量子点水溶液在400 nm左右的发光带是受限态发光,归因于ZnS量子点表面锌原子空位产生的载流子辐射再结合;复合后发光带从400 nm红移到425 nm左右。

关键词: 硫化锌, 量子点, 聚氨酯, 复合材料, 荧光光谱

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