Abstract: TiO2 nanotube arrays were synthesized in the ethylene glycol electrolyte contains 0. 25wt;NH4 F and 2 mL H2 O by electrochemical anodization. The formed TiO2 nanotube arrays annealed at different temperatures were compared in terms of their morphologies, structures, element composition and hydrophilicity. The results show that the morphologies of the TiO2 nanotube arrays keep the same when the annealing temperature below 600 ℃, but some TiO2 nanotubes collapsed when the annealing temperature reached 600 ℃. Aa the annealing temperature increasing, the structure of TiO2 changes from amorphous to crystal, the contact angle and hydrophilicity become better. On the other hand, F element also has a clear effect on hydrophilicity of TiO2 nanotube arrays. Less F element content results in better hydrophilicity of TiO2 nanotube arrays.

Key words: TiO2 nanotube arrays were synthesized in the ethylene glycol electrolyte contains 0. 25wt;NH4 F and 2 mL H2 O by electrochemical anodization. The formed TiO2 nanotube arrays annealed at different temperatures were compared in terms of their morphologies, structures, element composition and hydrophilicity. The results show that the morphologies of the TiO2 nanotube arrays keep the same when the annealing temperature below 600 ℃, but some TiO2 nanotubes collapsed when the annealing temperature reached 600 ℃. Aa the annealing temperature increasing, the structure of TiO2 changes from amorphous to crystal, the contact angle and hydrophilicity become better. On the other hand, F element also has a clear effect on hydrophilicity of TiO2 nanotube arrays. Less F element content results in better hydrophilicity of TiO2 nanotube arrays.