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

Chien Chon Chen, Jin Shyong Lin, Wei-Guang Diau, Tzeng Feng Liu

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

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 8×10 9 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 TiO 2 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 TiO 2 surface inside the tube.

Original languageEnglish
Pages (from-to)615-620
Number of pages6
JournalApplied Physics A: Materials Science and Processing
Volume92
Issue number3
DOIs
StatePublished - 1 Aug 2008

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