High density TiO2 nanombe film with hexagonal shape and narrow size distribution was fabricated by templating ZnO nanorod array film and sol-gel process. Well-aligned ZnO nanorod array films obtained by aqueous solution method were used as template to synthesize ZnO/TiO2 core-shell structure through sol-gel process. Subsequently, TiO2 nanotube array films survived by removing the ZnO nanorod cores using wetchemical etching. Polycrystalline anatase TiO2 nanotube films were similar to 1.5 mu m long and similar to 100 nm in inter diameter with a wall thickness of similar to 10nm. (c) 2006 Elsevier B.V. All rights reserved.