One-Step Synthesis and Characterization of Highly Ordered Titanium Dioxide Nanotubes with Bamboo-Like Rings

Report No. ARL-TR-6646
Authors: Joshua Martin; Samuel G. Hirsch; Anit Giri; Mark H. Griep; Shashi P. Karna
Date/Pages: September 2013; 20 pages
Abstract: Titanium dioxide nanotube (TiNT) arrays have been of intense interest to the alternative energies field in recent years, specifically dye-sensitized solar cell (DSSC) designs, due to their barrier-free, 1-D electron conduction pathway compared to the high number of grain boundaries and 3-D pathway of titanium dioxide (TiO2) nanoparticles. In this work, highly ordered, densely packed, hexagonal TiO2 nanotubes were synthesized in a single-step anodization of Ti foil using a constant dc potential of 60 V. The synthesized titania nanotubes exhibit a bamboo-like structure, with rings that form on uniform, discrete planes at a number of separation distances. Previous studies have noted that the separation distances as well as ring thickness can be controlled via alternating DC potential. However, it is clear that bamboo-ring nucleation sites in fact develop under constant voltage conditions and may serve as nucleation sites for larger, more distinct ring-like structures.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2013