Figure 4

(a) Fluorescence response of BS-GQDs at different excitation wavelengths, (b) Fluorescence response of BS-GQDs at different pH values and (c) Time-dependent fluorescence response of BS-GQDs.
(a) Fluorescence response of BS-GQDs at different excitation wavelengths, (b) Fluorescence response of BS-GQDs at different pH values and (c) Time-dependent fluorescence response of BS-GQDs.