Local structure of TiO2-derived nanotubes prepared by the hydrothermal process

The structure of TiO2-derived nanotubes with about 10 nm outer diameter and 5 nm inner diameter and a few hundred nanoineters in length prepared by the hydrothermal process in an aqueous NaOH solution was investigated. Especially, the local structure of TiO2-derived nanotubes was analyzed in detail on short-range order by extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) measurements. It was found that TiO2-derived nanotubes were mainly composed of layered titanate and the anatase-like structure was partly present in the titanate-based nanotubes. The formation of the anatase-like structure was thought to be caused from the consolidation of nanotubes.