Formation of vertically grown 1D TiO<sub>2</sub> nanorods on the surface of Al<sub>2</sub>O<sub>3</sub>/Ti composites by simple heat treatment and their photocatalytic performance

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  • SHI Shengfang
    The Institute of Scientific and Industrial Research, Osaka University
  • GOTO Tomoyo
    The Institute of Scientific and Industrial Research, Osaka University
  • CHO Sung Hun
    The Institute of Scientific and Industrial Research, Osaka University
  • HASHIMOTO Hideki
    The Institute of Scientific and Industrial Research, Osaka University
  • YIN Shu
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • LEE Soo Wohn
    Department of Environmental and Bio-Chemical Engineering, Sun Moon University
  • SEKINO Tohru
    The Institute of Scientific and Industrial Research, Osaka University

Abstract

<p>A simple method was used to form one-dimensional (1D) TiO2 nanorod arrays on the surfaces of hot-pressed Ti-dispersed Al2O3 composites by heating. After heating below 600°C, the Ti surface morphologies had changed significantly, while the Al2O3 surfaces remained unchanged. After heating for 5 h above 500°C, vertically grown nanorods were observed on the surfaces of Ti grains among Al2O3/Ti composites, which exhibited a crystalline phase of rutile-type TiO2 doped with a small quantity of aluminum. Nanorod formation was believed to be due to Ti diffusion and its acceleration by Al incorporation. The photocatalytic activity of the heated Al2O3/Ti composites was verified by rhodamine B degradation under ultraviolet light irradiation, although the oxide fraction on the composites was small. The activity was enhanced by 1D TiO2 nanorod growth on the composite surface.</p>

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