Fabrication of Through-Hole TiO sub(2) Nanotube Arrays by Bilayer Ti Foils Anodization

Through-hole TiO2 nanotube arrays were successfully prepared by using mechanical coupling Ti/Ti foils as anode. By continuously anodization, one Ti foil was thoroughly fabricated into TiO2 nanotube arrays, and the bottom barrier of TiO2 nanotube arrays was extended to the other Ti foil layer. The physical gap between two Ti foils allowed the TiO2 nanotube arrays to be easily separated from the barrier layer. Thus the through-hole TiO2 nanotube arrays were obtained. The method is simple but effective to thoroughly remove the bottom barrier layer and obtain through-hole TiO2 nanotube arrays without any complicated processes.