The fabrication of highly ordered and visible-light-responsive Fe-C-N-codoped TiO2 nanotubes.

A one-step method for the fabrication of Fe-C-N-codoped TiO2 nanotubes by electrochemical anodization is reported. The proposed method is both simple and efficient. The prepared samples were annealed at 550 degrees C for 3 h. The resulting nanotubes were characterized by SEM, XRD, XPS, EDX and UV-vis spectrophotometer. The results showed that the average tube diameter of the nanotubes was 70 nm and wall thickness was 20 nm and the average tube length was 2.4 microm. The doped TiO2 nanotubes exhibited strong absorption in the visible-light region. The maximum photocurrent efficiency measured under solar simulator was 2.7%.