Water-resistant surfaces using zinc oxide structured nanorod arrays with switchable wetting property

SURFACE & COATINGS TECHNOLOGY

卷:299

Article

Ennaceri, Houda^1,2  Wang, Lan³  Erfurt, Darja^4,5  Riedel, Wiebke^3,6  Mangalgiri, Gauri³  Khaldoun, Asmae²  El Kenz, Abdallah¹  Benyoussef, Abdelilah¹  Ennaoui, Ahmed^3,7,8 

[1] Mohammed V Univ Agdal, Fac Sci, Dept Phys, Lab Magnetism & Phys High Energies,URAC 12, BP 1014, Rabat, Morocco

[2] Al Akhawayn Univ, Sch Sci & Engn, POB 104, Ifrane 53000, Morocco

[3] Helmholtz Zentrum Berlin Mat & Energie, Hahn Meitner Pl 1, D-14109 Berlin, Germany

[4] Tech Univ Berlin, Str 17 Juni 135, D-10632 Berlin, Germany

[5] Helmholtz Zentrum Berlin, Competence Ctr Thin Film & Nanotechnol Photovolta, Schwarzschildstr 3, D-12489 Berlin, Germany

[6] Free Univ Berlin, Takustr 3, D-14195 Berlin, Germany

[7] QEERI, POB 5825, Doha, Qatar

[8] HBKU, POB 5825, Doha, Qatar

关键词: Super-hydrophobic;    Water contact angle;    Zinc oxide;    Nanorod arrays;    Rose petal effect;    Photo-catalysis;   

DOI  :  10.1016/j.surfcoat.2016.04.056

来源: Elsevier

【 摘 要 】

This study presents an experimental approach for fabricating super-hydrophobic coatings based on a dual roughness structure composed of zinc oxide nanorod arrays coated with a sputtered zinc oxide nano-layer. The ZnO nanorod arrays were grown by means of a low-temperature electrochemical deposition technique (75 degrees C) on FTO substrates. The ZnO nanorods show a (002) orientation along the c-axis, and have a hexagonal structure, with an average length of 710 nm, and average width of 156 nm. On the other hand, the crystallite size of the top-coating sputtered ZnO layer is of 30 nm. The as-deposited ZnO nanorod arrays exhibited a hydrophobic behavior, with a surface water contact angle of 108 degrees, whereas the dual-scale roughness ZnO nanorods coated with sputtered ZnO exhibited a super-hydrophobic behavior, with a surface water contact angle of 157 degrees and a high water droplet adhesion. The photo-catalytic activity of the samples was investigated against the degradation of methylene blue under UV-A irradiation (365 nm). The ZnO nanorod arrays showed good photocatalytic activity whereas the superhydrophobic ZnO nanorod arrays top-coated with sputtered ZnO showed minimal activity regarding the degradation of methylene blue. The superhydrophobic films exhibited high sensitivity to UV light, with a UV-induced switching behavior from super-hydrophobic to super-hydrophilic after only 30 min of UV exposure. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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