The formation of micrometer-long TiO<sub>2</sub> nanotube arrays by anodization of titanium film on conducting glass substrate
Tang, Yuxin; Tao, Jie; Dong, Zhili; Oh, Joo Tien; Chen, Zhong; Tang, Yuxin; School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore; College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, People's Republic of China; Tao, Jie; College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, People's Republic of China; Dong, Zhili; School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore; Oh, Joo Tien; School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore; Chen, Zhong; School of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore
Журнал:
Advances in Natural Sciences: Nanoscience and Nanotechnology
Дата:
2011-12-01
Аннотация:
Micrometer-long titanium oxide nanotube arrays, tens of nanometers in diameter, were fabricated by anodization of titanium film coated on a conducting glass substrate. The Ti film was deposited by magnetron sputtering at room temperature. The effect of anodizing conditions on the formation of TiO<sub>2</sub> nanotubes was investigated. The results indicate that dense and uniform Ti film deposited under 150 W at room temperature was favorable for the formation of ordered nanotube arrays. The average diameter of the TiO<sub>2</sub> nanotubes varied from 35 to 95 nm when the anodization potential changed from 10 to 40 V. Micrometer-long nanotubes (1.1 μm) with good adhesion to the substrate could be obtained in 0.5 wt% NH<sub>4</sub>F/glycerol at 30 V for 2 h. After heat treatment, the crystalline anatase nanotubes show enhanced photoelectrochemical activity compared with those anodized in 1 M H<sub>3</sub>PO<sub>4</sub>/0.5 wt% HF. This is attributed to the increased light-harvesting abilities.
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