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Fig.1 TEM, XPS, FTIR characterizations of CDs （A） TEM images of CDs（insert shows the HRTEM of CDs）； （B） size distribution statistics； （C） XPS spectra of CDs； （D—F） the deconvolution of high resolution C1s， N1s， O1s XPS spectra of CDs， respectively； （G） FTIR spectra； （H） UV-Vis absorption spectrum； （I） fluorescence spectra at different excitation wavelengths of CDs.