Fig. 5

SEM images of the iodine-doped TiO₂ nanotube structure. Microscopic representation of the iodine-doped TiO₂ nanotube structure. At 10,000-fold (left), 20,000-fold (middle), and 50,000-fold (right) magnifications, the microscopic representation of the iodine-doped TiO₂ nanotube structure as observed by SEM imaging. Some crystal structures were deposited on the surfaces of the nanotubes, which were tightly bound and distributed along the orifices and circumferences of the tubes