Abstract
The formation of TiO 2 nanotubes was conducted by atomic layer deposition (ALD) with tris-(8-hydroxyquinoline) gallium (GaQ 3 ) nanowires as a template at different substrate temperatures, 50, 100, and 200 °C. TiO 2 nanotubes were formed only at 50 and 100 °C. Although a higher growth rate at 50 °C was observed, nanotubes with better uniformity, conformality, and less residual chloride were obtained at 100 °C because of a different formation mechanism. A photocatalysis test of TiO 2 nanotubes prepared by different cycle numbers at 100 °C was conducted. It showed that TiO 2 nanotubes prepared by 400 cycles of ALD and treated at 700 °C for 1h to form anatase phase had the best photocatalytic performance. Compared with P-25, the nanotubes showed higher photocatalytic degradation of rhodamine B and water splitting efficiency. © 2011 IOP Publishing Ltd.