Journal of Guangxi Normal University(Natural Science Edition) ›› 2014, Vol. 32 ›› Issue (2): 106-110.

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Size Effects of Water-Soluble CdTe Quantum Dot in Metal Ion Detection Applications

JIAO Hang-zhou1,2, LIANG Zhen-hua1,2, PENG Gui-hua1,2, ZHOU Huang-xin1,2   

  1. 1. College of Chemistry and Pharmacy, Guangxi Normal University, Guilin Guangxi 541004, China;
    2. Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources of State Education Ministry, Guangxi Normal University, Guilin Guangxi 541004, China
  • Received:2014-02-27 Online:2014-06-25 Published:2018-09-25

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Abstract: Different sizes of thioglycolic acid capped CdTe quantum dots were synthesized in aqueous solution, the effects of their size on the sensitivity and selectivity in the fluorometric determination of metal ion were studied. It was found that the small sizes of QDs displayed no significant quenching or enhancement responses to most of the observed metal ions except Hg2+, while the QDs with large size displayed no significant quenching or enhancement responses to most of the observed metal ions except Ag+. The detection limits of Hg2+ and Ag+ were 8.7 nmol/L and 9.9 nmol/L, respectively. The different phenomena that different size of QDs function with Hg2+ may be due to the small size of QDs has a larger radius caused by quenching, and the phenomena of Ag+ may be due to occurring transfer processes after the large size of the QDs function with Ag+. This study illuminated unambiguously that improvement of sensing performance by the use of QDs could be achieved readily through fine-tuning their particle sizes and should be considered as an important factor for the development of QDs based probes.

Key words: water-soluble, quantum dot, metal ion, detection, size effect

CLC Number: 

  • O657.39
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