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Selectivity of two kinds of quantum dots for different metal ions. F0 is the fluorescence intensity of the quantum dots; F is the fluorescence intensity when metal ions are added; F/F0 is the fluorescence quenching efficiency of the quantum dots. (a) Selectivity of N-CQDs for different metal ions (25 μM); (b) selectivity of cadmium selenide (CdSe) quantum dots for different metal ions (25 μM).
