Preparation and photocatalytic wettability conversion of TiO 2-based superhydrophobic surfaces

Xintong Zhang, Ming Jin, Zhaoyue Liu, Shunsuke Nishimoto, Hidenori Saito, Taketoshi Murakami, Akira Fujishima

Research output: Contribution to journalArticle

95 Citations (Scopus)

Abstract

We present here a facile method for the preparation of TiO 2-based superhydrophobic surfaces. It consists of two steps: (1) roughening of the TiO2 surface with a rf (radio frequency) plasma with CF4 as an etchant and (2) modification of the roughened TiO 2 surface with an octadodecylphosphonic acid (ODP) monolayer. Plasma etching caused the thinning of the TiO2 film but at the same time enhanced its surface roughness. A discontinuous wedgelike surface microtexture was formed after etching for 30 s, which, after modification with a monolayer of ODP, showed Cassie-type water super-repellency with a contact angle (CA) hysteresis smaller than 2°. The state of water super-repellency (water CA > 165°) could be converted to the state of superhydrophilicity (water CA ∼0°) by means of ultraviolet (UV) illumination as a result of the photocatalytic decomposition of the ODP monolayer by TiO2. Readsorption of ODP molecules leads directly to the recovery of water super-repellency.

Original languageEnglish
Pages (from-to)9477-9479
Number of pages3
JournalLangmuir
Volume22
Issue number23
DOIs
Publication statusPublished - Nov 7 2006
Externally publishedYes

Fingerprint

wettability
Wetting
preparation
Water
Contact angle
Monolayers
acids
Acids
water
etchants
Plasma etching
plasma etching
Hysteresis
Etching
radio frequencies
surface roughness
Lighting
Surface roughness
recovery
illumination

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Zhang, X., Jin, M., Liu, Z., Nishimoto, S., Saito, H., Murakami, T., & Fujishima, A. (2006). Preparation and photocatalytic wettability conversion of TiO 2-based superhydrophobic surfaces. Langmuir, 22(23), 9477-9479. https://doi.org/10.1021/la0618869

Preparation and photocatalytic wettability conversion of TiO 2-based superhydrophobic surfaces. / Zhang, Xintong; Jin, Ming; Liu, Zhaoyue; Nishimoto, Shunsuke; Saito, Hidenori; Murakami, Taketoshi; Fujishima, Akira.

In: Langmuir, Vol. 22, No. 23, 07.11.2006, p. 9477-9479.

Research output: Contribution to journalArticle

Zhang, X, Jin, M, Liu, Z, Nishimoto, S, Saito, H, Murakami, T & Fujishima, A 2006, 'Preparation and photocatalytic wettability conversion of TiO 2-based superhydrophobic surfaces', Langmuir, vol. 22, no. 23, pp. 9477-9479. https://doi.org/10.1021/la0618869
Zhang, Xintong ; Jin, Ming ; Liu, Zhaoyue ; Nishimoto, Shunsuke ; Saito, Hidenori ; Murakami, Taketoshi ; Fujishima, Akira. / Preparation and photocatalytic wettability conversion of TiO 2-based superhydrophobic surfaces. In: Langmuir. 2006 ; Vol. 22, No. 23. pp. 9477-9479.
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