论文期刊

Fluorescence turn-on sensing of trace cadmium ions based on EDTA-etched CdTe@CdS quantum dot




作者: Si-Nan Wang, Jian Zhu ⁎ , Xin Li, Jian-Jun Li, Jun-Wu Zhao ⁎
发表/完成日期: 2018-05-01
期刊名称: Spectrochimica Acta Part A
期卷: 201 (2018)
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论文简介
Cadmium-caused environmental pollution and diseases have always been worldwide problems. Thus it is ex-
tremely urgent to establish a cheap, rapid, simple and selective detection method for trace cadmium in drinking
water. In this study, a fluorescence “turn-on” method based on ethylene diamine tetraacetic acid (EDTA)-etched
CdTe@CdS quantum dots (QDs) was designed to detect Cd 2+ . High resolution transmission electron microscopy
(HRTEM) and X-rayphotoelectron spectroscopy(XPS)wereutilizedfor chemicaland structuralcharacterization
of the as-prepared QDs. Based on chemical etching of EDTA on the surface of CdTe@CdS QDs, specific Cd 2+ rec-
ognitionsiteswereproduced,andthenresultsinfluorescencequenching.TheintroductionofCd 2+ couldidentify
these sites and restore the fluorescence of the EDTA-QDs system. Under the optimum conditions, the nanoprobe
shows a linear response range from 0.05 to 9 μM with a very low detection limit of 0.032 μM. In addition, the re-
portedfluorescenceprobeinthis workdisplaysa goodselectivity fortraceCd 2+ over other metalionsandanad-
mirable practicability in real water samples.
© 2018 Elsevier B.V. All rights reserved.