Abstract
The multi-layer TiO 2 nanotube array thin films have been formed by anodic oxidation method via adjusting the outer voltage during oxidation process in glycerol electrolyte containing 0.3% NH 4HF 2. The diameter of the nanotube array increases with the outer voltage, and the length of nanotube in every layer increases with the anodic oxidation time. These multi-layers bring new possibilities to tailor the properties of the TiO 2 nanotube array thin films formed via anodic oxidation method. Further, such multi-layer structure provide a new approach to evaluate the growth rate of TiO 2 nanotube, which will help us to understand more deeply the formation mechanism of the TiO 2 nanotubes. The growth rate of TiO 2 nanotube array is respectively 1.2 and 3.6 μm/h under the anodic voltage of 30 V and 60 V. These multi-layer TiO 2 nanotube array thin films may exhibit lots of potential applications in photoelectrochemical fields.
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