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We report a novel and environmentally friendly fluorescent probe for detecting copper ion (Cu 2+ ) using glutathione (GS)-protected Au nanoclusters (GS-Au NCs). The fluorescence-based sensing behavior by GS-Au NCs toward metal ions was investigated in buffered aqueous media. Among the metal ions studied, Cu 2+ , Hg 2+ and Pb 2+ were found to efficiently quench the fluorescence...
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