Photoinduced Hydrophilicity of Heteroepitaxially Grown ZnO Thin Films
- 17 June 2005
- journal article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry B
- Vol. 109 (27), 13307-13311
- https://doi.org/10.1021/jp051499s
Abstract
Single crystalline ZnO thin films were heteroepitaxially grown on sapphire substrates by rf-magnetron sputtering. The ZnO films on sapphire A and C face were oriented along the (0001) direction, whereas the ZnO film on sapphire R face was oriented along the (11−20) direction. The rate of photoinduced hydrophilic conversion strongly depended on the surface crystal structure. The ZnO film oriented along the (11−20) direction exhibited a higher hydrophilicizing rate than those oriented along the (0001) direction. The high hydrophilicizing rate of the ZnO oriented along the (11−20) direction is due to its surface atomic arrangement. The outermost layer of the ZnO surface of the (11−20) face contains oxygen ions, which are considered to be energetically reactive sites and responsible for the hydrophilic conversion.Keywords
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