TiO₂ Nanotubes: Selective Removal of the Outer Shells of Anodic TiO₂ Nanotubes (Small 1/2013)

The image shows a facile electrochemical method described in detail on page 37 by Y. Y. Li and co-workers. The method enables selective removal of the outer walls of anodic TiO2 nanotubes by leaving the as-anodized nanotubes in the same electrolyte and applying an electric field parallel to the anodic film for several minutes. The betterseparated single-walled TiO2 nanotubes thus obtained show significantly improved photocatalytic efficiency compared with their non-etched counterparts.