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Abstract: Anatase TiO2 nanotubes and titanate nanotubes have been successfully synthesized via hydrothermal synthesis followed by post-treatment from titanium powder. The morphology and crystalline structure of the nanotubes are characterized in detail with transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) respectively. The nanotubes have an average outer diameter of around 9–10 nm and the inner diameter around 3–4 nm with several hundred nanometers in length. A mechanism for the anatase TiO2 nanotubes transformation has also been proposed. Nanotubes are formed during the solvent thermal process, and the compositions are changed by subsequent ionic exchange and dehydration under high temperature. These tubular materials can be very useful in the fields of photocatalysts, photoelectronics and energy-storage technologies. [Copyright &y& Elsevier]

Abstract: Micro-and nanoscale spherical anatase TiO2 films have been successfully prepared via evaporizing–deposition route. The morphology and the crystalline structure of the samples were characterized in more detail with field emission scanning electron microscopy (FE–SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. The TiO2 films with micro-and nanoscale surface structures can be constructed by simply adjusting the evaporation condition of TiCl4 in the air after being annealed. These surfaces can be turned from super-hydrophilic to super-hydrophobic after modification with a thin layer of hydrophobic silicone, mainly depending on the surface morphology. [Copyright &y& Elsevier]