Preparation and photocatalytic wettability conversion of TiO2-based superhydrophobic surfaces.
Preparation and photocatalytic wettability conversion of TiO2-based superhydrophobic surfaces.
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DOI：
10.1021/la0618869
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发表时间：
2006-10
期刊：
影响因子：
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通讯作者：
Xintong Zhang;M. Jin;Zhaoyue Liu;S. Nishimoto;H. Saito;T. Murakami;A. Fujishima
中科院分区：
文献类型：
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作者：
Xintong Zhang;M. Jin;Zhaoyue Liu;S. Nishimoto;H. Saito;T. Murakami;A. Fujishima
本文提出了一种制备二氧化钛基超疏水表面的简便方法。该工艺包括两个步骤：(1)用射频等离子体以CF4作为蚀刻剂对TiO2表面进行粗化；(2)用八十二烷基膦酸（ODP）单层对粗化后的TiO2表面进行改性。等离子体刻蚀使TiO2薄膜变薄，但同时增强了其表面粗糙度。蚀刻30 s后，表面形成不连续的楔形微织构，经单层ODP改性后，具有卡西型超拒水性，接触角（CA）滞后小于2度。二氧化钛光催化ODP单层膜的分解，使ODP膜在紫外线照射下由超疏水状态（水CA约为165℃）转变为超亲水性状态（水CA约为0℃）。ODP分子的再吸附直接导致超拒水性的恢复。
We present here a facile method for the preparation of TiO2-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 TiO2 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 degrees . The state of water super-repellency (water CA >165 degrees) could be converted to the state of superhydrophilicity (water CA approximately 0 degrees) 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.