Asmatulu, RamazanKarthikeyan, AnnamalaiBell, David C.Ramanathan, ShriramAziz, Michael2009-04-152009Asmatulu, Ramaazan, Annamalai Karthikeyan, David C. Bell, Shriram Ramanathan, and Michael J. Aziz. 2009. Synthesis and variable temperature electrical conductivity studies of highly ordered TiO2 nanotubes. Journal of Materials Science 44(17): 4613-4616.0022-2461http://nrs.harvard.edu/urn-3:HUL.InstRepos:2795734Rafts of aligned, high aspect ratio TiO₂ nanotubes were fabricated by an electrochemical anodization method and their axial electrical conductivities were determined over the temperature range 225-400 °C. Length, outer diameter and wall thickness of the nanotubes were approximately 60-80 µm, 160 nm and 30 nm, respectively. Transmission electron microscopy studies confirmed that the TiO₂ nanotubes were initially amorphous, and became polycrystalline anatase after heat treatment attemperatures as low as 250 °C in air. The activation energy for conductivity over the temperature range 250 - 350 °C was found to be 0.87 eV. The conductivity values are comparable to those of nanocrystalline and nanoporous anatase thin films reported in literature.en-USelectrical conductivityelectrochemical anodization of TiTiO2 nanotubes10.1007/s10853-009-3703-5