Fig. 1From: Carbon Dots as an Effective Fluorescent Sensing Platform for Metal Ion DetectionAqueous solution of diaminopolyethylene glycol (PEG1500N)-attached CDs (a) excited at 400 nm and photographed through band-pass filters of different wavelengths (as indicated) and the CDs (b) excited at the indicated wavelengths and photographed directly [32]Back to article page