One-pot synthesis of dual carbon dots using only an N and S co-existed dopant for fluorescence detection of Ag+

This figure shows the changes of emission wavelengths with the excitation wavelengths. Inset: Photograph of CCA+GITC dots under excitation wavelength of 520 nm (right) and schematic diagram of the hydrothermal treatment of CA and GITC (left), which is possible to synthesize two kinds of CDs (labeled as N-CDs and S-CDs) simultaneously, and both have different fluorescence features because one of them becomes not PL with the excitation wavelength up to 420 nm.155