198497.fig.009
Figure 9: The relation between intensity of value signal and visible light absorption of three TiO2 samples; h(ESR) refers to the signal intensity at g = 2.003, h(F(R′)) refers to the absorption intensity at 450 nm, F(R′) = (1− )2/(2 ), F(R′) and refer to absorptivity and reflectance at λ = 450 nm.