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Highly selective and ultrasensitive detection ofHg2+ based on fluorescence quenching of Au nanoclusters by Hg2+–Au+ interactions

Chemical Communications · 2009 · Vol. 46(6) · pp. 961–963

Jianping Xie(Institute of Bioengineering and Nanotechnology)Yuangang Zheng(Institute of Bioengineering and Nanotechnology)Jackie Y. Ying✉(Institute of Bioengineering and Nanotechnology)

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Abstract

A simple label-free method for the detection of Hg(2+) ions with high selectivity and sensitivity has been developed by using fluorescent Au NCs in aqueous media. The sensing mechanism was based on the high-affinity metallophilic Hg(2+)-Au(+) interactions, which effectively quenched the fluorescence of Au NCs.

Nanocluster Synthesis and Applications Advanced Nanomaterials in Catalysis Molecular Sensors and Ion DetectionNanoclustersFluorescenceSelectivityChemistryIonAqueous mediumAqueous solutionQuenching (fluorescence)PhotochemistryDetection limit