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The Detection of Pb2+ Using Glutathione Capped Mn Doped ZnS QDs

[ Vol. 11 , Issue. 3 ]

Author(s):

Wei Bian, Hao Zhang, Fang Wang, Jing Ma, Yanli Wei, Shaomin Shuang and Zongwei Cai   Pages 168 - 174 ( 7 )

Abstract:


L-glutathione decorated Mn doped ZnS QDs (GSH-Mn: ZnS QDs) were synthesized in aqueous solution. The characterization of as-prepared QDs was carried out through fluorescence, ultraviolet-visible absorption (UV-vis), TEM and Fourier transform infrared spectroscopy (FTIR). Pb2+ had obvious quenching effect on the fluorescence intensity of GSH-Mn: ZnS QDs. Under optimal factors, a nice linear relationship between the fluorescence response and the concentration of Pb2+ was established from 0.025µM to 15.5µM range with a correlation coefficient of 0.9981 and the detection limit is 0.018µ . This probe was triumphantly made use of the detecting of Pb2+ in tap and pond water. At the same time, it was preliminary inferred that the fluorescence quenching way of Pb2+ to QDs was dynamic quenching. The present study provides a simple, low-cost route toward production of GSH-Mn: ZnS QDs for chemo/bio sensing and other adhibition.

Keywords:

Mn: ZnS QDs, glutathione, Pb2+, fluorescence quenching.

Affiliation:

School of Basic Medical Science, Shanxi Medical University, Taiyuan 030001, PR China.

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