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Synthesis of Aluminum-Doped TiO2 Nanotubes by Anodization Method

We report the synthesis of Al-doped TiO2 nanotubes (Al-TNT) by DC anodization method at 50 volts. The method is simple, cost effective, environmentally safe and the samples produced are of good quality. The electrolytesolution was composed of ethylene glycol (EG), ammonium fluoride (0.3% wt NH4F), deionized water (2% vol H2O) and varying molar masses of aluminum nitrate - Al (NO3)3. The samples were analyzed XRD before and after annealing at 450 °C for 2 hours. The surface morphology and the elemental analysis of the annealed samples were characterized by SEM and ED-XRF respectively. The results show that phase transformation only occur after annealing. And that the surface organization, uniformity and structure are influenced by the concentration of the dopant element.