TiO₂ Nanotube Arrays Fabricated by Anodization

Abstract

TiO 2 nanotube arrays were fabricated through anodization in the glycol electrolyte system. The new composite structures of the bottom nanotube and the upper nanowire with a length of 15 um to 20 um were prepared. The influence of the water contents in the electrolyte with respect to the composite structure was studied through two-step anodization. The results show that the composite structure can be obtained based on the moderate etching rate of the electrolyte and the selective etching of the nanotube when the glycol system electrolyte contains 0.4wt% NH 4 F and 2 vol% H 2 O.