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An “Off–On” approach for highly sensitive and selective detection of mercury ions (Hg2+) and l-cysteine (l-Cys) was demonstrated with the use of water-soluble carbon dots (CDs) as novel fluorescent probe. In this present sensing system, Hg2+ cations can efficiently coordinate onto the surface of CDs by means of electrostatic interactions and remarkably quench the fluorescence signal of CDs as a result...
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