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

doi:10.1021/la0618869

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 journal › Article › peer-review

104 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 language	English
Pages (from-to)	9477-9479
Number of pages	3
Journal	Langmuir
Volume	22
Issue number	23
DOIs	https://doi.org/10.1021/la0618869
Publication status	Published - Nov 7 2006
Externally published	Yes

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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title = "Preparation and photocatalytic wettability conversion of TiO 2-based superhydrophobic surfaces",

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.",

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AU - Zhang, Xintong

AU - Jin, Ming

AU - Liu, Zhaoyue

AU - Nishimoto, Shunsuke

AU - Saito, Hidenori

AU - Murakami, Taketoshi

AU - Fujishima, Akira

PY - 2006/11/7

Y1 - 2006/11/7

N2 - 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.

AB - 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.

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

Abstract

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