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Journal of Nanomaterials
Volume 2013 (2013), Article ID 157494, 9 pages
http://dx.doi.org/10.1155/2013/157494
Research Article

The Microstructure and Capacitance Characterizations of Anodic Titanium Based Alloy Oxide Nanotube

1Department of Electrical Engineering, Texas A&M University, College Station, TX 77843-3128, USA
2Department of Engineering Technology, Texas A&M University, College Station, TX 77843-3367, USA
3Department of Energy Engineering, National United University, Miaoli 36003, Taiwan

Received 15 April 2013; Accepted 18 June 2013

Academic Editor: Anukorn Phuruangrat

Copyright © 2013 Po Chun Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper presents a simple anodization process to fabricate ordered nanotubes (NTs) of titanium and its alloys (Ti-Mo and Ti-Ta). TiO2, MoO3, and Ta2O5 are high dielectric constant materials for ultracapacitor application. The anodic titanium oxide contains a compact layer on the NT film and a barrier layer under the NT film. However, the microstructure of oxide films formed by anodic Ti-Mo and Ti-Ta alloys contains six layers, including a continuous compact layer, a continuous partial porous layer, a porous layer, a net layer, an ordering NT film, and an ordering compact barrier layer. There are extra layers, which are a partial porous layer and a porous layer, not presented on the TiO2 NT film. In this paper, we fabricated very high surface area ordered nanotubes from Ti and its alloys. Based on the differences of alloys elements and compositions, we investigated and calculated the specific capacitance of these alloys oxide nanotubes.