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Highly ordered titania (TiO2) nanotube arrays were synthesized via one-faced and single-step anodization method. Titanium foils were anodized in ethylene glycol based electrolytes containing 0.25 wt% NH4F, 2 vol% H2O, and doped with various concentrations of K3[Fe(CN)6] at applied voltage of 50 V for 2 h at room temperature. As-anodized samples were annealed at 450 °C for 2 h in order to transform the amorphous titania to nanocrytalline anatase. Highly ordered titania nanotube arrays were obtained after K3[Fe(CN)6] at different concentrations was introduced. The surfaces of TiO2 nanotubes were smoother after increasing concentrations of K3[Fe(CN)6], confirmed by AFM investigation. Doping of K3[Fe(CN)6] successfully extended the absorption spectrum of samples in range of 200 to 375 nm and slightly increased their band gap energy. Doping with 0.20 wt% K3[Fe(CN)6] caused Ti 2p shift towards lower binding energy due to the reduction of Ti4+ to Ti3+, thus improving the electrochemical performance of titania nanotubes. This work suggests an alternative method for fine tuning the size of TiO2 nanotube arrays that widely applied in the field of energy conversion materials.
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