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(a) Fluorescence (FL) spectra of A-CDs, C-CDs, D-CDs, and F-CDs. (b) FL spectra of A-CDs under different excitation wavelengths. (c) FL spectra of C-CDs under different excitation wavelengths. (d) FL spectra of D-CDs under different excitation wavelengths. (e) FL spectra of F-CDs under different excitation wavelengths.
