Figure 5.
(a) Valence-band XPS spectra of various TiO2 samples. (b) A schematic illustration of supercells of anatase TiO2 and 4B-TiO2−x models (red, O atoms; blue, Ti atoms; green, B atoms). (c) Calculated DOS of Pure TiO2, TiO2−x, and various B-TiO2−x. (d) Decomposition of the total DOS of 4B-TiO2−x into partial DOS of Ti, O, and B orbitals. (e) Schematic illustration of the DOS of pure TiO2, TiO2−x and B-TiO2−x.