Preparation of nanoporous titanium oxide films by electrochemical anodic oxidation

Abstract

We have investigated the conditions of the formation of tubular layers of nanoporous TiO₂ (NPTO) by the anodic oxidation of Ti in a 1% ammonium fluoride solution in ethylene glycol. The results demonstrate that increasing the anode current density and anodization time increases the nanotube diameter. A model has been proposed for the formation of tubular NPTO layers. The model builds on the concept of anisotropic Ti etching. The rate of the formation of the tubular structure of TiO₂ has been shown to be limited by the oxide film growth rate under the conditions of this study.