Photocatalytic activity of titania nanohole arrays

Titania nanohole array with various hole diameters was obtained by liquid phase deposition (LPD) method. Photocatalytic activity of titania nanohole arrays was estimated by the photodecomposition properties of acetaldehyde and methylene blue. The photodecomposition rates of methylene blue and acetaldehyde were increased with heat treatment temperature. Titania nanohole array sintered at 1173 K showed the highest photocatalytic activity. This result was caused by the fact that the crystallinity increased with heat treatment temperature and the specific surface area of titania nanohole array was almost constant with heat treatment. The sample with the 250 and 200 nm diameter showed the highest photocatalytic activity.