Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (5): 874.

• Articles • Previous Articles     Next Articles

Preparation of CdSe/CdS/SiO2 Nanospheres and Their Luminescent Properties

MA Xiao-Bo1,2, NIE Wei2, WANG Ce1, ZHANG Wan-Jin1*, JI Xiang-Ling2   

  1. 1. Alan G. MacDiarmid Lab, Jilin University, Changchun 130012, China;
    2. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  • Received:2009-10-14 Online:2010-05-10 Published:2010-05-10
  • Contact: ZHANG Wan-Jin. E-mail: wjzhang@jlu.edu.cn
  • Supported by:

    国家“九七三”计划项目(批准号: 2007CD936203, S2009061009)、国家自然科学基金(批准号: 50973038, 50873045)、国家“八六三”计划项目(批准号: 2007AA03Z324)、长春市科技局项目(批准号: 2008228)和国家自然科学基金委创新研究群体(批准号: 50621302)资助.

Abstract:

Luminescent CdSe/CdS core-shell quantum dots were synthesized by two-phase method. These CdSe/CdS quantum dots are encapsulated with silica spheres from hydrolysis of tetraethylorthosilicate(TEOS) in the presence of ammonium. Adjusting the amount of quantum dots and ammonia, the reaction temperature and time as well as ratio of solvents, the size of as-prepared CdSe/CdS/SiO2 nanospheres can be tuned in the range of 23—145 nm. The samples are characterized by TEM, UV-Vis, and fluorescence spectrometer, respectively. The highest quantum yield(QY) of the CdSe/CdS/SiO2 sample can reach 8.0%.

Key words: Quantum dot; Encapsulation; SiO2; Luminescence; Quantum yield

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