Efficient Synthesis of Large Quantities of Titania Nanotubes Powders by Anodization

Abstract

Titanium oxide (or titania) is a biocompatible, wide band-gap semiconductor material with a variety of applications, from photovoltaics and photocatalysis to sunscreen pigments and food industry. Titania nanotubes arrays add to the intrinsic material properties the advantage of increased active surface area, up to three orders of magnitude higher than thin films. æWe are reporting on the synthesis of gram quantities of titania powders made of micron sized bundles of nanotubes by using a cheap, simple method involving the DC anodization of titanium foil in chloride-ions-containing solutions. This simple lab-scale method can be easily scaled up to industrial size. æWe studied the influence of various anodization parameters such as chloride ions concentration, voltage, solution pH on the yield of the final titania nanotubes powders. Post processing characterization tools such as SEM imaging, X-Ray Diffraction have been employed, and possible applications in Dye Sensitized Solar Cells have been investigated.