Cytidine-stabilized gold nanocluster as a fluorescence turn-on and turn-off probe for dual functional detection of Ag and Hg |
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Authors: | Yuanyuan Zhang Hui JiangXuemei Wang |
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Affiliation: | State Key Lab of Bioelectronics (Chien-Shiung Wu Laboratory), Southeast University, No. 2 Sipailou, Nanjing 210096, PR China |
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Abstract: | In this study, we have developed a label-free, dual functional detection strategy for highly selective and sensitive determination of aqueous Ag+ and Hg2+ by using cytidine stabilized Au NCs and AuAg NCs as fluorescent turn-on and turn off probes, respectively. The Au NCs and AuAg NCs showed a remarkably rapid response and high selectivity for Ag+ and Hg2+ over other metal ions, and relevant detection limit of Ag+ and Hg2+ is ca. 10 nM and 30 nM, respectively. Importantly, the fluorescence enhanced Au NCs by doping Ag+ can be conveniently reusable for the detection of Hg2+ based on the corresponding fluorescence quenching. The sensing mechanism was based on the high-affinity metallophilic Hg2+–Ag+ interaction, which effectively quenched the fluorescence of AuAg NCs. Furthermore, these fluorescent nanoprobes could be readily applied to Ag+ and Hg2+ detection in environmental water samples, indicating their possibility to be utilized as a convenient, dual functional, rapid response, and label-free fluorescence sensor for related environmental and health monitoring. |
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Keywords: | Gold nanocluster Fluorescence Silver ion Mercury ion Reusable sensor Lake water |
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