Abstract
Fabrication and applications of self-organized TiO2 nanotube arrays is briefly 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. TiO2 in nanowire form, nanotube form and other nanoporous structures is desirable because of its high surface–volume ratio, high surface activity and superior sensitivity. TiO2 nanotubes and nanofibers have been developed by diverse techniques such as sol-gel, electrodeposition and anodization. In recent years, there has been significant progress in nano-structured TiO2 fabrication using the anodization method. This consists of oxidation (corrosion) of titanium foils or titanium thin films deposited onto substrates (e.g., silicon), immersed in acid or neutral F-containing solutions. Significant interest has arisen in anodization parameters, such as applied potential, concentration and type of corrosive solutions, anodization time length and temperature. This parameters influence mechanical-structural, chemical and electrical features of porous TiO2. Recent work concerning fabrication, applications and growth models is described in this review paper.
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