Table 1. Eg values calculated from Fig. 4.; Table 2. Eg values calculated from Fig. 5. from Study on the photoelectrical performance of anodized titanium sheets

Eg can be calculated by the equation: Eg (eV) = 1240 / λg. However, the method to determinate λg value is not uniform in different literatures. In this paper, we used the mostly common method to determinate the value of λg , namely the intersection point of the curve tangent to the ultraviolet absorption long wave direction and the baseline. With the values of λg in Figure 4, we calculated Eg values which were listed in Tables 1. From Table 1, it can be seen that the value of Eg has no obvious relation to anodization voltage while anodization duration was kept at 10 min.;Eg can be calculated by the equation: Eg (eV) = 1240 / λg. However, the method to determinate λg value is not uniform in different literatures. In this paper, we used the mostly common method to determinate the value of λg , namely the intersection point of the curve tangent to the ultraviolet absorption long wave direction and the baseline. With the values of λg in Figure 5, we calculated Eg values which were listed in Tables 2. From Table 2 it can be seen that the value of Eg decrease with the increase of anodization duration while voltage was kept at 100 V. It means less energy is needed to create the charge transfer transition.