CRCU

Chemical Research in Chinese Universities ›› 2010, Vol. 26 ›› Issue (6): 880-883.

• Articles • Previous Articles     Next Articles

Ultrafast Microwave-hydrothermal Synthesis of CdTe Nanocrystal and Its Application to Fingerprint Detection

SHEN Qi-hui1, LIU Yan1, ZOU Ming-qiang2, LI Jin-feng2, ZHOU Jian-guang3* and MENG Chang-gong1*   

  1. 1. Department of Chemistry, Dalian University of Technology, Dalian 116024, P. R. China;
    2. Chinese Academy of Inspection and Quarantine, Beijing 100123, P. R. China;
    3. Research Center for Analytical Instrumentation, Zhejiang University, Hangzhou 310058, P. R. China
  • Received:2009-12-02 Revised:2010-03-01 Online:2010-11-25 Published:2010-12-01
  • Contact: MENG Chang-gong;ZHOU Jian-guang E-mail:cgmeng@dlut.edu.cn;jgzhou70@126.com
  • About author:ZHOU Jian-guang and MENG Chang-gong. E-mail: cgmeng@dlut.edu.cn; jgzhou70@126.com
  • Supported by:

    Supported by the National Natural Science Foundation of China(Nos.20775076 and 20875084) and the National Technology Research & Development Program in the 11th Five-Year Plan of China(No.2006BAK10B09).

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Abstract: We have developed a microwave-assisted hydrothermal method, where both microwave and hydrothermal techniques are utilized to synthesize CdTe nanocrystals with high quality in less than 55 s. Among the known preparation methods, the monodisperse CdTe nanocrystals showing narrow emission spectra, widest scope of emission peak(from 500 nm to 822 nm) and high quantum yield(up to 80%) were synthesized by this route. The quantum yield of CdTe with near-infrared emission(>800 nm) is up to 10%, which is better than that of InAs(0.5%―2%) synthesized in organic phase. Moreover, we detected the latent fingerprints on aluminum, plastic, glass and papers by prepared CdTe nanocrystals, and photoluminescence fingerprints images were taken with a digital camera. Then the images would transmitt into fingerprint detection system of computer to identify the criminals in suit.

Key words: CdTe, Microwave-hydrothermal synthesis, Fingerprint identification, Nanocrystal