Preparation and Photocatalytic Wettability Conversion of TiO2-Based Superhydrophobic Surfaces
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- 作者：Xintong Zhang ; Ming Jin ; Zhaoyue Liu ; Shunsuke Nishimoto ; Hidenori Saito ; Taketoshi Murakami ; Akira Fujishima
- 刊名：Langmuir
- 出版年：2006
- 出版时间：November 7, 2006
- 年：2006
- 卷：22
- 期：23
- 页码：9477 - 9479
- 全文大小：258K
- 年卷期：v.22,no.23(November 7, 2006)
- ISSN：1520-5827
文摘
We present here a facile method for the preparation of TiO2-based superhydrophobic surfaces. It consists of twosteps: (1) roughening of the TiO2 surface with a rf (radio frequency) plasma with CF4 as an etchant and (2) modificationof the roughened TiO2 surface with an octadodecylphosphonic acid (ODP) monolayer. Plasma etching caused thethinning of the TiO2 film but at the same time enhanced its surface roughness. A discontinuous wedgelike surfacemicrotexture 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 ODPmolecules leads directly to the recovery of water super-repellency.
. 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 ODPmolecules leads directly to the recovery of water super-repellency.