Journal
LUMINESCENCE
Volume 32, Issue 6, Pages 1092-1099Publisher
WILEY
DOI: 10.1002/bio.3296
Keywords
fluorescence sensor; glutathione; mercury ion measurement; metal nanoclusters
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Funding
- National Natural Science Foundation of China [21177090, 21175094]
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In this paper, an innovative and facile one-pot method for synthesizing water-soluble and stable fluorescent Cu nanoclusters (CuNCs), in which glutathione (GSH) served as protecting ligand and ascorbic acid (AA) as reducing agent was reported. The resultant CuNCs emitted blue-green fluorescence at 440nm, with a quantum yield (QD) of about 3.08%. In addition, the prepared CuNCs exhibited excellent properties such as good water solubility, photostability and high stability toward high ionic strength. On the basis of the selective quenching of Hg2+ on CuNCs fluorescence, which may be the result of Hg2+ ion-induced aggregation of the CuNCs, the CuNCs was used for the selective and sensitive determination of Hg2+ in aqueous solution. The proposed analytical strategy permitted detection of Hg2+ in a linear range of 4 x 10(-8) to 6 x 10(-5)M, with a detection limit of 2.2 x 10(-8)M. Eventually, the practicability of this sensing approach was confirmed by its successful application to assay Hg2+ in tap water, Lotus lake water and river water samples with the quantitative spike recoveries ranging from 96.9% to 105.4%.
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