Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 8, Issue 4, Pages 544-548Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2006.01.023
Keywords
titanium dioxide nanotubes; nitrogen doping; photoelectrochemistry; ammonia
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Self-organized TiO2 nanotube-layers were formed by electrochemical anodization of Ti in a HF/H2SO4 electrolyte. The nanotube layers were then treated at different temperatures (300-600 degrees C) in pure NH3. The samples were characterized by photoelectrochemistry, SEM, XRD and XPS. The results show clearly successful N-doping of the TiO2 nanotubes. The magnitude of the effect is strongly dependent on the duration and temperature of the ammonia treatment. Besides N-doping, the heat treatment causes - in one step - a conversion of the amorphous tubes to anatase. Both effects drastically improve the photoresponse of the TiO2 nanotubes. (c) 2006 Elsevier B.V. All rights reserved.
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