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Wettability of porous two-dimensional ZnO nanocrystal films

Authors

  • D. Shi,

    1. State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
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  • X. C. Wang,

    1. Key Laboratory of Materials Physics, and School of Physics and Engineering, Zhengzhou University, Zhengzhou 450052, China
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  • Z. W. Yao,

    1. State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
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  • F. Liu,

    1. State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
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  • X. B. Zhang,

    1. State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
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  • J. P. Cheng

    Corresponding author
    1. State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
    • State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
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Abstract

Large-scale two-dimensional ZnO nanocrystal films on aluminum substrate were fabricated by a one-step hydrothermal method under mild conditions, where all the ZnO nanocrystals had a lamellar structure generally perpendicular to the substrates and formed network-like porous configurations. The morphologies of the films were dependent on both the reaction temperature and concentration of zinc. The wettability of the ZnO films was assessed by measuring the water contact angle without any surface functionalisation. The porous structures of the as-prepared films could effectively enhance its hydrophobicity and the water contact angle ranged from 40° to 135° depending on the surface morphology and the arrangement of ZnO planes, indicating a simple and promising route to make aluminum surface waterproof and even self-cleaning. The hydrophobic ZnO surface could be switched to hydrophilic state by UV irradiation.

Abstract

A grande échelle films nanocristaux de ZnO à deux dimensions sur substrat d'aluminium ont été fabriquées par un procédé hydrothermal en une étape dans des conditions douces, où tous les nanocristaux de ZnO ont une structure lamellaire généralement perpendiculaire aux substrats et formé des configurations poreux de type réseau. Les morphologies des films dépendent à la fois la température de réaction et la concentration de zinc. La mouillabilité des films de ZnO a été évaluée en mesurant l'angle de contact de l'eau sans la fonctionnalisation de surface. Les structures poreuses des films pourrait effectivement augmenter l'hydrophobie et l'angle de contact de l'eau variait de 40 à 135° en fonction de la morphologie de surface et l'arrangement des plans de ZnO, indiquant une route simple et promettant de faire surface en aluminium imperméable et même auto-nettoyant. La surface hydrophobe de ZnO pouvaient être transformés en état hydrophile par irradiation UV.

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