TiO2-based superhydrophobic-superhydrophilic pattern with an extremely high wettability contrast

Shunsuke Nishimoto, Michiaki Becchaku, Yoshikazu Kameshima, Yuki Shirosaki, Satoshi Hayakawa, Akiyoshi Osaka, Michihiro Miyake

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Rough nanostructured anatase TiO2 surfaces containing many pores were prepared by the hydrothermal-based method. Surface modification with self-assembled monolayers (SAMs) of octadecylphosphonic acid (ODP) resulted in the superhydrophobic surface with an extremely high static water contact angle (CA) of 173.6°± 1.7°. This superhydrophobic surface could be converted into a superhydrophilic surface with a water CA of nearly 0°by irradiating it with ultraviolet (UV) light, which induced photocatalytic decomposition of the ODP SAM. A superhydrophobic-superhydrophilic pattern with an extremely high wettability contrast (a water CA difference of over 170°) could be fabricated on the ODP-modified TiO2 surface by area-selective UV irradiation through a photomask. This is the report of the TiO2-based superhydrophobic-superhydrophilic pattern with a water CA difference of over 170°, and it may be possible to use such patterns for various applications.

Original languageEnglish
Pages (from-to)221-226
Number of pages6
JournalThin Solid Films
Volume558
DOIs
Publication statusPublished - May 2 2014

Keywords

  • Photocatalyst
  • Self-assembled monolaye
  • Superhydrophobic-superhydrophilic pattern
  • Titanium dioxide
  • Wettability

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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