Fabrication and applications of self-organized TiO 2 nanotube arrays is briefl y reviewed. This nanoscale material has attracted considerable attention owing to its potential in gas sensing, photo-thermal and photovoltaic conversion devices, photoelectrolysis and photocatalysis, etc. TiO 2 in nanowire form, nanotube form and other nanoporous structures is desirable because of its high surface -volume ratio, high surface activity and superior sensitivity. TiO 2 nanotubes and nanofi bers have been developed by diverse techniques such as sol-gel, electrodeposition and anodization. In recent years, there has been signifi cant progress in nanostructured TiO 2 fabrication using the anodization method. This consists of oxidation (corrosion) of titanium foils or titanium thin fi lms deposited onto substrates (e.g., silicon), immersed in acid or neutral F -containing solutions. Signifi cant interest has arisen in anodization parameters, such as applied potential, concentration and type of corrosive solutions, anodization time length and temperature. This parameters infl uence mechanical-structural, chemical and electrical features of porous TiO 2 . Recent work concerning fabrication, applications and growth models is described in this review paper.