Fig. 4: Fluorescence and absorption features of “Filtered solution I, II and III”.
From: Precursor-free synthesis of carbon quantum dots and carbon microparticles in supercritical acetone
a Colour of acetone before the experiment and “Filtered solution I, II and III”. The left and right photographs in each pair of them were, respectively, taken under irradiation of white light and UV light of 365 nm wavelength in a dark box. b Fluorescence spectra of “Filtered solution III”. The excitation wavelength was changed from 300 to 490 nm at 10 nm intervals. c Absorption spectrum of “Filtered solution III”.
