The financial support by K. Iwama Endowed Chair fund, the von Liebig Grant at UC San Diego, and UC Discovery Grant No. ele08-128656/Jin is gratefully acknowledged.
Fabrication of Gradient TiO2 Nanotubes on Ti Foil by Anodization†
Version of Record online: 15 FEB 2013
Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Engineering Materials
Volume 15, Issue 6, pages 464–468, June 2013
How to Cite
Ni, J.-H., Frandsen, C. J., Chen, L.-H., Zhang, Y.-Y., Khamwannah, J., He, G., Tang, T.-T. and Jin, S. (2013), Fabrication of Gradient TiO2 Nanotubes on Ti Foil by Anodization. Adv. Eng. Mater., 15: 464–468. doi: 10.1002/adem.201200311
- Issue online: 11 JUN 2013
- Version of Record online: 15 FEB 2013
- Manuscript Revised: 21 DEC 2012
- Manuscript Received: 11 OCT 2012
A new anodization based method is developed to fabricate a gradient in TiO2 nanotube diameters and lengths on Ti foil. In the method, the applied anodization voltage is increased step by step, while the Ti foil is immersed into an aqueous solution of hydrofluoric acid progressively during anodization. The gradient TiO2 nanotubes with tube diameters ranging from 55 to 105 nm and lengths ranging from 300 to 500 nm across 12 mm of Ti foil are obtained. The formation mechanism of gradient diameter and length is also discussed. The gradient structure is potentially useful as new cell instructive materials (CIMs) for guided cell movement and culture, novel drug delivery vehicles, size-selective biosensors, or other sensor applications.