Tunable and reversible surface wettability transition of vertically aligned ZnO nanorod arrays

被引：55
|
作者：
Das, S. N. [1 ]
Choi, J. H. [1 ]
Kar, J. P. [1 ]
Myoung, J. M. [1 ]
机构：
[1] Yonsei Univ, Dept Mat Sci & Engn, Informat & Elect Mat Res Lab, Seoul 120749, South Korea
来源：
APPLIED SURFACE SCIENCE | 2009年 / 255卷 / 16期
关键词：
Hydrophobicity; ZnO; Nanorods; FIELD-EMISSION; FILMS;
D O I：
10.1016/j.apsusc.2009.03.090
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Vertically aligned zinc oxide (ZnO) nanorods (NRs) with different surface morphology were grown by metal organic chemical vapor deposition (MOCVD) on sapphire substrate. To study the effect of surface morphology on wettability, the contact angle (CA) of water was measured. It was demonstrated that the CA of the deposited ZnO NRs varied between 104 degrees and 135 degrees depending upon the surface morphology. The ZnO NRs became super-hydrophilic after ultraviolet (UV) illumination. However, the NR arrays were reconverted to their previous hydrophobic state after low temperature annealing (50 degrees C) in open atmosphere. Structural effect and preferential adsorption of water molecules on the defective sites of UV illuminated surface was used to explain the transition mechanism. Under the alternations of heat treatment and UV illumination, a reversible transition between hydrophobicity and super-hydrophilicity were observed. (C) 2009 Elsevier B. V. All rights reserved.
引用
收藏
页码：7319 / 7322
页数：4
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