Diameter-controlled growth of TiO2 nanotube arrays by anodization and its photoelectric property

This work describes the diameter-controlled growth of the TiO2 nanotube arrays by anodization of Ti foils in the ethylene glycol/HF electrolytes with variant fluoride concentration under a constant applied voltage (30 V). The results reveal synthesis of TiO2 arrays of nanotubes with diameters ranging from 20 to 41 nm when fluoride concentration varied from 0.1 to 0.5 M in the electrolytes. The influence of the fluoride concentration on the diameter and the wall thickness of the TiO2 nanotubes was discussed. The photocurrent response experiments indicate that the TiO2 arrays of nanotubes with diameter of 20 nm had the superior photoelectric property. (C) 2009 Elsevier B.V. All rights reserved.