Article

Applied Physics A

, Volume 92, Issue 3, pp 615-620

Self-cleaning characteristics on a thin-film surface with nanotube arrays of anodic titanium oxide

  • Chien-Chon ChenAffiliated withDepartment of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University
  • , Jin-Shyong LinAffiliated withDepartment of Material Science and Engineering, National Chiao Tung University
  • , Eric Wei-Guang DiauAffiliated withDepartment of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University Email author 
  • , Tzeng-Feng LiuAffiliated withDepartment of Material Science and Engineering, National Chiao Tung University

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Abstract

Self-cleaning of a surface of nanotube arrays of anodic titanium oxide (ATO) is demonstrated. The ATO was prepared in fluoride ion containing sulfate electrolytes with a structure of 0.4 μm length, 100 nm pores diameter, 120 nm interpore distance, 25 nm pore wall thickness, a 8×109 pores cm−2 pore density, and 68.2% porosity. Prepared as thin films either directly from a Ti foil or on a glass substrate, these arrays have the property that water drops spread quickly over the surface of the films without irradiation. In contrast, a flat anatase TiO2 film requires irradiation with UV light for several minutes before the contact angle decreases to zero. The observed self-cleaning behavior of the ATO thin films is due to the capillary effect of the nanochannel structure and the superhydrophilic property of the anatase TiO2 surface inside the tube.

PACS

96.15.Lb 61.46.-W 61.46.Fg