Dense and high-hydrophobic rutile TiO2 nanorod arrays
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- Peng, X. & Chen, A. Appl. Phys. A (2005) 80: 473. doi:10.1007/s00339-004-3052-9
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Dense and well-oriented rutile TiO2 nanorod arrays were synthesized on a titanium substrate using the organic compound dibutyltin dilaurate as the oxygen source in the oxidation of Ti at 850 °C. The influence of temperature on the nanostructured TiO2 formation and the effect of the TiO2 structures on their wettability were also investigated. Polycrystalline TiO2 grains were formed at 800 °C; in contrast, TiO2 micro-whiskers were grown on the Ti substrate at 900 °C. The measurement of the water contact angle shows that the wetting property of the TiO2 films strongly depends on their surface structure. The surface of the dense well-oriented nanorod arrays is highly hydrophobic with a water contact angle of 130 °C. This study has demonstrated that the direct oxidation of Ti substrate using an organic oxygen source is a promising method for fabrication of large scale, uniform and well-aligned TiO2 nanorod arrays on titanium substrates.