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(a) UV-vis absorption spectra. (b) Kubelka–Munk-transformed function of TiO2, uCN and T1/uCN1. (c,d) Mott–Schottky plots of uCN (c) and TiO2 (d). (e) Valence band XPS spectrum of TiO2 and uCN. (f) Diagram of the band structure of TiO2 and uCN.
