Fabrication of a patterned TiO2 nanotube arrays in anodic oxidation

In general, the fabrication of self-ordered TiO2 nanotube arrays, under conventional constant-voltage anodization, results in only straight nanotube arrays. In the present work, we report on variation of nanotube morphology by modifying the anodization conditions. This approach offers substantial advantages over conventional anodization processes in terms of the fabrication of flexible dimensional architectures. We could see small variation of the nanotube diameter in the experiments using rocking voltage applied anodization in the ethylene glycol based electrolyte. Applying of abruptly increased voltage induced to separate into two nanotube segments having different diameters. We suggest that these new types of nanotube array architecture will be useful for new base materials for the development of nano-scale devices.