Journal of Materials Research

Rapid Communications

Titanium oxide nanotube arrays prepared by anodic oxidation

Dawei Gonga1, Craig A. Grimesa1a), Oomman K. Varghesea1, Wenchong Hua2, R. S. Singha2, Zhi Chena2 and Elizabeth C. Dickeya3

a1 Department of Electrical Engineering and Materials Research Institute, 208 Materials Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802

a2 Departments of Material Science and Engineering, and Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802

a3 Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802

Abstract

Titanium oxide nanotubes were fabricated by anodic oxidation of a pure titanium sheet in an aqueous solution containing 0.5 to 3.5 wt% hydrofluoric acid. These tubes are well aligned and organized into high-density uniform arrays. While the tops of the tubes are open, the bottoms of the tubes are closed, forming a barrier layer structure similar to that of porous alumina. The average tube diameter, ranging in size from 25 to 65 nm, was found to increase with increasing anodizing voltage, while the length of the tube was found independent of anodization time. A possible growth mechanism is presented.

(Received May 11 2001)

(Accepted September 12 2001)

Footnotes

a) e-mail: cgrimes@engr.psu.edu

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