Preparation of Energy Devices with Oxide nanohole arrays.

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The formation process and the photocatalytic activity of the oxide nanohole arrays were evaluated. The fabrication of the various oxide nanohole arrays with various hole diameter were succeeded by immersion of the anodic alumina in metal fluoride solutions. The crystal structure of titania nanohole arrays as prepared was amorphous. As titania nanohole array annealed at 773 K, the crystal structure became anatase. Photocatalytic activity of titania nanohole arrays were estimated by the photodecomposition properties of methylene blue and acetaldehyde. The activity of photodecomposition of methylene blue and acetaldehyde was increased with heat treatment temperature. Titania nanohole array annealed at 1173 K showed the highest photocatalytic activity. This result was caused by that the specific surface area of titania nanohole array was almost constant with heat treatment. Titania nanohole array with various hole diameter was prepared. The sample with the 250 nm and 200 nm diameter showed the highest photocatalytic activity.