The Synergistic Effect of Nitrogen Dopant and Calcination Temperature on the Visible-Light-Induced Photoactivity of N-Doped TiO₂

Figure 7

XPS survey and core level spectra of (a)-(b) N 1s, (c)-(d) Ti 2p, and (e)-(f) O 1s of N-TiO₂ samples.

(a)

(b)

(c)

(d)

(e)

(f)