Synthesis and variable temperature electrical conductivity studies of highly ordered TiO2 nanotubes
Asmatulu, Ramazan Karthikeyan, Annamalai Bell, David C. Ramanathan, Shriram Aziz, Michael J.
Asmatulu, Ramazan
Karthikeyan, Annamalai
Bell, David C.
Ramanathan, Shriram
Aziz, Michael J.
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2009-09-01
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Keywords
After-heat treatment,Electrical conductivity,Electrochemical anodization,High aspect ratio,Nanocrystalline,Nanoporous anatase,Outer diameters,Polycrystalline,Temperature range,Tio,Variable temperature,Wall thickness,Activation energy,Amorphous materials,Aspect ratio,Nanotubes,Photoresists,Titanium dioxide,Titanium oxides,Transmission electron Microscopy,Electric network analysis
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Citation
Asmatulu, R., Karthikeyan, A., Bell, D.C. et al. Synthesis and variable temperature electrical conductivity studies of highly ordered TiO2 nanotubes. J Mater Sci 44, 4613–4616 (2009). https://doi.org/10.1007/s10853-009-3703-5
Abstract
Rafts of aligned, high aspect ratio TiO<inf>2</inf> 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 TiO<inf>2</inf> nanotubes were initially amorphous, and became polycrystalline anatase after heat treatment at temperatures 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. © 2009 Springer Science+Business Media, LLC. © 2009 Elsevier B.V., All rights reserved.
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This is an open access article under the CC BY license.
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Springer Nature
Journal
Journal of Materials Science
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15734803
00222461
00222461