Issue 22, 2009

Formation of various TiO2nanostructures from electrochemically anodized titanium

Abstract

TiO2nanostructures, including nanowires, highly ordered nanotube arrays, and single crystalline nanoplates, were obtained from electrochemically anodized Ti foil in a fluorine-containing ethylene glycol electrolyte. The TiO2nanowires, formed by the electric field induced chemical splitting of TiO2nanotubes by fluoride ions during a lengthy anodization can be isolated from the nanotube arrays by mild ultrasonication. The highly ordered TiO2nanotubes buried underneath are thus exposed. The transformation of as-prepared amorphous TiO2nanotubes into the anatase or rutile phase as a function of annealing temperature was systematically scrutinized by Raman spectroscopic measurements in conjunction with TEM imaging. In the latter study, the ultramicrotomed sections of the samples clearly exhibited the formation of highly crystalline TiO2. More importantly, crystalline TiO2nanotubes were mechanically broken into intriguing single crystalline TiO2 nanoplates as a result of ultramicrotoming. The present study not only demonstrates a facile approach to produce high quality TiO2nanowires, nanotubes, and nanoplates in a simple manner, but also provides valuable insights into temperature dependent crystalline transformation in the anodic TiO2nanotube arrays.

Graphical abstract: Formation of various TiO2nanostructures from electrochemically anodized titanium

Article information

Article type
Paper
Submitted
03 Mar 2009
Accepted
14 Mar 2009
First published
20 Apr 2009

J. Mater. Chem., 2009,19, 3682-3687

Formation of various TiO2nanostructures from electrochemically anodized titanium

J. Wang, L. Zhao, V. S.-Y. Lin and Z. Lin, J. Mater. Chem., 2009, 19, 3682 DOI: 10.1039/B904247D

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