Title:The Detection of Pb<sup>2+</sup> Using Glutathione Capped Mn Doped ZnS QDs
VOLUME: 11 ISSUE: 3
Author(s):Wei Bian, Hao Zhang, Fang Wang, Jing Ma, Yanli Wei, Shaomin Shuang and Zongwei Cai
Affiliation:School of Basic Medical Science, Shanxi Medical University, Taiyuan 030001, PR China.
Keywords:Mn: ZnS QDs, glutathione, Pb2+, fluorescence quenching.
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.
