Photocatalytic Activity under Simulated Sunlight of Bi-Modified TiO₂ Thin Films Obtained by Sol Gel

Figure 4

Ti 2p region spectra evolution as a function of bismuth content (a) 0, (b) 0.5, (c) 4.9, (d) 10.4, (e) 21.5, and (f) 25.4 at. %.