Fig. 14

HM-CDs as sensing agents. a Binding of metal ions or molecules on CDs causes fluorescence quenching. b Fluorescence spectra of honey-CDs in the absence (black) and presence (red) of 100 μM Fe³⁺. Inset: photographs. c Fluorescence spectra of honey-CDs in the presence of different concentrations of Fe³⁺. Reprinted with permission from ref. [43]. Copyright (2014) Elsevier