TiO2 nanotube array with “multi-layer” walled structure and its vulnerability to water

Abstract

“Multi-layer” walled TiO2 nanotube array has been prepared by anodization with post-treatment of ethanol. Two post-treatment methods, which were ethanol and water treatment respectively, exerted a marked and different effect on the structure of nanotube. With ethanol immersion, the “multi-layer” walled nanotube can be obtained, while water treatment cannot produce the “multi-layer” walled structure. The main reason could be the uptake of carbon and fluoride during anodization process. Compared with “single-layer” walled TiO2 nanotube, “multi-layer” walled TiO2 nanotube demonstrated higher photocatalytic activity.