Research Article

The Photocatalytic Property of Nitrogen-Doped TiO2 Nanoball Film

Figure 4

UV-vis absorption spectroscopy of undoped and N-doped TiO2 with the wavelength in the range of (a) 200–800 nm and (b) versus curves.
179427.fig.004a
(a)
179427.fig.004b
(b)