Fabrication of TiO₂ Nanofilm Photoelectrodes on Ti Foil by Ti Ion Implantation and Subsequent Annealing

Figure 7

XPS spectra of the TiO₂ thin film at the valence band region, annealing at 400 (a), 500 (b), 600 (c), and 700°C (d) for 6 hours in oxygen atmosphere, respectively.

(a)

(b)

(c)

(d)