Visual and sensitive fluorescent sensing for ultratrace mercury ions by perovskite quantum dots

被引：75
作者：
Lu, Li-Qiang [1 ]
Tan, Tian [1 ]
Tian, Xi-Ke [1 ]
Li, Yong [1 ]
Deng, Pan [1 ]
机构：
[1] China Univ Geosci, Fac Mat Sci & Chem, Wuhan 430074, Hubei, Peoples R China
来源：
ANALYTICA CHIMICA ACTA | 2017年 / 986卷
基金：
中国国家自然科学基金;
关键词：
Perovskite QDs; Hg2+ detection; Surface ion-exchange; Visual sensing; ORGANOMETAL HALIDE PEROVSKITE; SOLAR-CELLS; SELECTIVE DETECTION; GOLD NANOPARTICLES; LUMINESCENT PROBES; AQUEOUS-SOLUTION; FACILE SYNTHESIS; SENSOR; HG2+; SPECTROMETRY;
D O I：
10.1016/j.aca.2017.07.014
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
Mercury ions sensing is an important issue for human health and environmental safety. A novel fluorescence nanosensor was designed for rapid visual detection of ultratrace mercury ions (Hg2+) by using CH3NH3PbBr3 perovskite quantum dots (QDs) based on the surface ion-exchange mechanism. The synthesized CH3NH3PbBr3 QDs can emitt intense green fluorescence with high quantum yield of 50.28%, and can be applied for Hg2+ sensing with the detection limit of 0.124 nM (24.87 ppt) in the range of 0 nM -100 nM. Furthermore, the interfering metal ions have no any influence on the fluorescence intensity of QDs, showing the perovskite QDs possess the high selectivity and sensitivity for Hg2+ detection. The sensing mechanism of perovskite QDs for Hg2+ is has also been investigated by XPS, EDX studies, showing Pb2+ on the surface of perovskite QDs has been partially replaced by Hg2+. Spot plate test shows that the perovskite QDs can also be used for visual detection of Hg2+. Our research indicated the perovskite QDs are promising candidates for the visual fluorescence detection of environmental micropollutants. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：109 / 114
页数：6
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