Noncompensated Codoping TiO₂ Nanowires: The Enhanced Visible Light Photocatalytic Properties

Figure 5

UV-vis absorption spectroscopy of pure, Fe doped, N doped, and Fe + N codoped TiO₂ with the wavelength in the range of (a) 200–800 nm and (b) (𝛼ℎ𝑣)² versus ℎ𝑣 curves.

(a)

(b)