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Nitrogen-doped TiO 2 nanotubes were synthesized by annealing of the anodized titania nanotubes with ammonia at the temperature of 500 °C. The ordered structure of titania nanotubes maintained after the nitrogen doping process, as is evidenced by SEM observations. Detailed structural analysis revealed that the phase transformation temperature of titania nanotube from anatase to rutile is decreased...
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