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Fluorescence response of C-dots1 in the absence and presence of Fe3 + (2.5 × 10−4 M) and S2O32− (3.0 × 10−3 M); a: C-dots1, b: C-dots1/Fe3 + , c: C-dots1/S2O32−, d: C-dots1/Fe3 + /S2O32−. Inset: Bar diagram showing the fluorescence intensity changes for different combination of inputs, Red color: in the presence of low concentration of S2O32− (2 × 10−4 M), Green color: in the presence of high concentration of S2O32− (3.0 × 10−3 M).
