期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 134, 期 2, 页码 367-372出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2008.05.005
关键词
Titania nanotubes arrays; Calcination; Conductivity; Electrochemical property; Photocurrent
资金
- Chinese Scholarship Council and the supporting of Science Foundation of Chongqing Science and Technology Committee [2007BB4157]
- National Science Foundation [DMI-0455994]
- Air Force Office of Scientific Research [FA9550-06-1-032]
Titania nanotube arrays fabricated by anodic oxidation of titanium foil were calcined in dry nitrogen, air, and argon at various temperatures for varied period of time. Changes in morphology and crystallinity of the nanotube arrays were studied by means of SEM and XRD. The influences of annealing conditions on the electrochemical and conductivity were investigated by electrochemical impedance spectroscopy (EIS), and the results showed that the electrical conductivities of TiO2 nanotube arrays calcined in nitrogen for 3 h were improved greatly as compared to the as-grown titania nanotube arrays or annealed in air or argon. Well defined oxidation and reduction peaks were observed during the cyclic voltammetric scan at 0.1 Vis in 10 mM K-3[Fe(CN)(6)] solution. Photocurrent response in TiO2 nanotube arrays calcined in nitrogen was significantly enhanced. Reduction of tetravalent titanium cations and the formation of oxygen vacancies were ascribed to explain the improved electrochemical and photoelectrical properties of titania nanotube arrays. (C) 2008 Elsevier B.V. All rights reserved.
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