Int. J. Nanomanufacturing, Vol. 5, Nos. 3/4, 2010 297 Copyright © 2010 Inderscience Enterprises Ltd. Fabrication of self-organised highly ordered titanium oxide nanotube arrays by anodic oxidation and characterisation Raheleh Mohammadpour and Mohammad Mahdi Ahadian Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran 14588-89694, Iran E-mail: mohammadpour@mehr.sharif.edu E-mail: ahadian_mm@yahoo.com Azam Iraji zad* and Nima Taghavinia Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran 14588-89694, Iran and Department of Physics, Sharif University of Technology, Tehran 11365-9161, Iran E-mail: Iraji@sharif.edu E-mail: taghavinia@sharif.edu *Corresponding author Abol Ghasem Dolati Department of Materials Science & Engineering, Sharif University of Technology, Tehran 11365-9466, Iran E-mail: dolati@sharif.edu Abstract: Self-organised and vertically oriented titanium oxide nanotube array (TNTA) has been synthesised by potentiostat anodisation of Ti foil in fluoride-based electrolyte. By varying the anodisation voltage from 8 V to 24 V it was possible to gradually change the topologies of nanotubes. The size of TNTAs was measured using SEM images and also determined based on a non-destructive optical method. In addition, photoelectrochemical properties of nanotubular TiO 2 /Ti electrodes were examined by anodic photocurrent response, potentiodynamic polarisation measurements and electrochemical impedance spectroscopy. A general equivalent circuit model was proposed for photoelectrochemical system consists of anodic nanotubular TiO 2 thin film electrode and test solution. Keywords: TiO 2 ; nanotube arrays; photoelectrochemical; photocurrent response; potentiodynamic polarisation; electrochemical impedance spectroscopy.