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(A) Schematic representation of synthesis of N,S co-doped CQDs for the detection of methotrexate. (B) Cyclic voltammogram of N,S co-doped CQDs in potassium hydrogen phthalate buffer solution (pH 4) (C) Schematic illustration of HOMO and LUMO energy levels of N,S co-doped CQDs and methotrexate. Reproduced with permission from Ref. [55].
