Title: Fabrication of self-organised highly ordered titanium oxide nanotube arrays by anodic oxidation and characterisation

Authors: Raheleh Mohammadpour, Mohammad Mahdi Ahadian, Azam Iraji zad, Nima Taghavinia, Abol Ghasem Dolati

Addresses: Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran 14588-89694, Iran. ' Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran 14588-89694, Iran. ' Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran 14588-89694, Iran; Department of Physics, Sharif University of Technology, Tehran 11365-9161, Iran. ' Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran 14588-89694, Iran; Department of Physics, Sharif University of Technology, Tehran 11365-9161, Iran. ' Department of Materials Science & Engineering, Sharif University of Technology, Tehran 11365-9466, Iran

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 TiO₂/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 TiO₂ thin film electrode and test solution.

Keywords: TiO2; titanium oxide; nanotube arrays; anodic oxidation; characterisation; photoelectrochemical; photocurrent response; potentiodynamic polarisation; electrochemical impedance spectroscopy; nanotubes; nanotechnology.

DOI: 10.1504/IJNM.2010.033872

International Journal of Nanomanufacturing, 2010 Vol.5 No.3/4, pp.297 - 309

Published online: 02 Jul 2010 *

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