Figure 2
TEM images of (A) N-CQDs (B) Aggregated N-CQDs by Co2+ (C) Disaggregated N-CQDs by DCA. Inset: the corresponding hydrodynamic diameter measured by DLS (D) Fluorescence emission spectra of N-CQDs/Co complex in the (1) absence and (2) presence of DCA. Inset: corresponding fluorescence images under UV light (365 nm).
