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(a) The UV/vis absorption and (b) The attenuated total reflection-Fourier-transform infrared (ATR-FTIR) spectrum of orange carbon dots (O-CDs) powder; (c,d) fluorescence spectrum and the normalized fluorescence spectrum of O-CDs aqueous solution. The concentration of O-CDs for UV/vis and fluorescence measurement is 0.03 and 0.005 mg/mL, respectively.
