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Caption : figure s1. (a) plot of ratio of fluorescence intensities versus ph, (b) mixing time, and (c) temperature. 

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Caption : figure s2. (a-c) fluorescence emission spectra of carbon dots under different excitation wavelengths (240, 260, and 280 nm) and (d) uv-vis spectra of mn from ph 1 to 13.

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Caption : figure s3. (a) fluorescence emission spectra of carbon dots using an excitation of 260 nm at different time intervals. (b) relative fluorescence intensity versus time.

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Caption : figure s4. (a) plot of fluorescence intensities measured at 432 nm and excited at 240, 260, and 280 nm under continuous 365-nm uv irradiation as a function of time.

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Caption : figure s5. (a, c, e) fluorescence emission spectra of carbon dots (0.01 mg·ml-1) in the presence of different concentrations of mn at ph 7 with different excitation wavelengths. (b, d, f) the plot between f0/f and concentrations of mn; inset figure shows the linear range of the plot.

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Caption : figure s6. (a, c, e) fluorescence emission spectra of carbon dots (0.10 mg·ml-1) in the presence of different concentrations of mn at ph 7 with different excitation wavelengths. (b, d, f) the plot between f0/f and concentrations of mn; inset figure shows the linear range of the plot.