453018.fig.004a
(a)
453018.fig.004b
(b)
453018.fig.004c
(c)
Figure 4: (a) The survey XPS spectra of N, Cd-TiO2, (b) N 1s XPS spectra of N, Cd-TiO2, (c) Cd 3d XPS spectra of N, Cd-TiO2.