Figure 2From: Photocurrent response and semiconductor characteristics of Ce-Ce2O3-CeO2-modified TiO2 nanotube arraysXRD patterns and XPS spectrum survey. (A) XRD patterns for (a) TNTs, (b) TNTs-Ce, and (c) TNTs-0.00025 C. (B) XPS spectrum survey of various samples. XPS spectrum of (C) Ce3d, (D) O1s, and (E) Ti2p of TNTs-0.00025 C.Back to article page