Recently, the well aligned TiO2 nanotube arrays prepared by electrochemical anodization have demonstrated their prospect applications in many fields. As a new structured and functional nanomaterial, they have attracted more and more attentions. Here, we reviewed the fabrication, properties, and applications of highly ordered TiO2 nanotube arrays made by anodic oxidation of titanium. Especially, we discussed in detail the synthesis of TiO2 nanotubes (NTs) with tunable morphologies by adjusting the reaction conditions during anodization to balance electrochemical reaction and chemical etching. Finally, some perspectives on the future development were tentatively discussed.

Contents
1 Introduction
2 Fabricating of TiO2 Nanotube Arrays by Anodization
2.1 The Effect of Electrolyte
2.2 The Effect of Anodic Materials
2.3 The Effect of Anodization Conditions
2.4 Preparation with Controllable Manner
2.5 Crystallization
3 Applications of TiO2 Nanotube Arrays
3.1 Organic-inorganic Solar Cells
3.2 Catalysis and Hydrogen Production from Water
3.3 Sensors
3.4 Biomaterials
3.5 Electrochemical Deposition
3.6 Others
4 Conclusions