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(a) Cell viability of HeLa cells after incubated with different concentrations of N/S-doped C-dots obtained from cellulose-based biowaste for 24 h; (b–f) fluorescence images of HeLa cells incubated with N/S-doped C-dots (40 μg/mL) under different conditions ((c): N/S-CDs only, (d–f): mixture of N/S-CDs and Fe3+ with concentrations of 10, 20 and 40 μM, respectively) [122].
