Nitrogen-doped TiO2 nanotube arrays (N-TNAs) were successfully fabricated by a\nsimple thermal annealing process in ambient N2 gas at 450 degree Centigrade for 3 h. TNAs with modified\nmorphologies were prepared by a two-step anodization using an aqueous NH4F/ethylene glycol\nsolution. The N-doping concentration (0-9.47 at %) can be varied by controlling N2 gas flow rates\nbetween 0 and 500 cc/min during the annealing process. Photocatalytic performance of as-prepared\nTNAs and N-TNAs was studied by monitoring the methylene blue degradation under visible light����
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