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A highly selective and simple fluorescent sensor for mercury (II) ion detection based on cysteamine‐capped CdTe quantum dots synthesized by the reflux method
Author(s) -
Ding Xiaojie,
Qu Lingbo,
Yang Ran,
Zhou Yuchen,
Li Jianjun
Publication year - 2015
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.2761
Subject(s) - cysteamine , cadmium telluride photovoltaics , quantum dot , mercury (programming language) , fluorescence , ion , nanotechnology , chemistry , materials science , optoelectronics , computer science , physics , optics , biochemistry , organic chemistry , programming language
Cysteamine (CA)‐capped CdTe quantum dots (QDs) (CA–CdTe QDs) were prepared by the reflux method and utilized as an efficient nano‐sized fluorescent sensor to detect mercury (II) ions (Hg 2+ ). Under optimum conditions, the fluorescence quenching effect of CA–CdTe QDs was linear at Hg 2+ concentrations in the range of 6.0–450 nmol/L. The detection limit was calculated to be 4.0 nmol/L according to the 3σ IUPAC criteria. The influence of 10‐fold Pb 2+ , Cu 2+ and Ag + on the determination of Hg 2+ was < 7% (superior to other reports based on crude QDs). Furthermore, the detection sensitivity and selectivity were much improved relative to a sensor based on the CA–CdTe QDs probe, which was prepared using a one‐pot synthetic method. This CA–CdTe QDs sensor system represents a new feasibility to improve the detection performance of a QDs sensor by changing the synthesis method. Copyright © 2014 John Wiley & Sons, Ltd.