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(A) The preparative process of magnetofluorescent CQDs through a microwave-assisted hydrothermal technique. (B) Fluorescence images of (a–d) HeLa and (e–h) HepG2 cells incubated with folic acid (FA)–Gd@CQDs (Scale bars = 40 μm). T1-weighted (i) HeLa and (j) HepG2 cellular magnetic resonance images of FA–Gd@CQDs at different concentrations are illustrated. MFCQDs: magnetofluorescent CQDs. Reproduced with permission from Ref [53]. Copyright 2017 American Chemical Society.
