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Issue 11, 2013
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Facile, sensitive, and ratiometric detection of mercuric ions using GSH-capped semiconductor quantum dots

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Abstract

Glutathione (GSH) capped CdTe semiconductor quantum dots (QDs) are applied for detecting mercuric ions (Hg2+) of trace quantity. The synthesis of GSH-capped CdTe (CdTe@GSH) QDs is cost-efficient and straightforward. We observed that Hg2+ can quantitatively quench the fluorescence of CdTe@GSH QDs and further induce the slight redshift of emission peaks due to the quantum confinement effect. Detailed studies by spectroscopy, dynamic light scattering (DLS), and electrospray ionization mass spectrometry (ESI-MS) demonstrated that the competitive Hg2+ binding with GSH makes the surface of CdTe QDs exposed, results in gradual aggregation, and quantitatively changes the photophysical properties of QDs. The whole procedure for detecting Hg2+ by this protocol took less than 10 min. The experimental limit of detection (LOD) of Hg2+ can be as low as 5 nM using CdTe@GSH with a low concentration (0.5 nM) because of the excellent fluorescent properties of QDs. This strategy may become a promising means to simply detect Hg2+ in water with high sensitivity.

Graphical abstract: Facile, sensitive, and ratiometric detection of mercuric ions using GSH-capped semiconductor quantum dots

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Publication details

The article was received on 03 Jan 2013, accepted on 26 Mar 2013 and first published on 27 Mar 2013


Article type: Paper
DOI: 10.1039/C3AN00011G
Citation: Analyst, 2013,138, 3230-3237
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    Facile, sensitive, and ratiometric detection of mercuric ions using GSH-capped semiconductor quantum dots

    X. Zhu, Z. Zhao, X. Chi and J. Gao, Analyst, 2013, 138, 3230
    DOI: 10.1039/C3AN00011G

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