Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (08): 1593-1598.doi: 10.3866/PKU.WHXB20090755

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Fabrication of Superhydrophobic ZnO Surfaces via Zn Foil Hydrothermal Reactions and Fluoroalkylsilane Modified Process

ZHOU Si-Si, GUAN Zi-Sheng, LI Qiang, LU Chun-Hua, XU Zhong-Zi   

  1. College of Materials Science and Technology, Nanjing University of Technology, Nanjing 210009, P. R. China
  • Received:2009-01-20 Revised:2009-05-05 Published:2009-07-16
  • Contact: ZHOU Si-Si


Cake-like, lotus leaf-like, trunk-like, and cactus-like ZnO surfaces grown directly on zinc substrates were fabricated by Zn foil hydrothermal reactions in an ethylenediamine solution at 120, 140, and 160 ℃. Scanning electron microscopy indicated that the micro-/submicro complex structures were more regular at longer reaction time and higher reaction temperature. The hydrophobicity of typical structured ZnO surfaces modified with a layer of fluoroalkylsilane were measured. Results showed that the structured surfaces prepared at 140 ℃ for 4 h as well as at 160 ℃ for 5 h exhibited superhydrophobicity with water contact angles of 154.6° and 157.3° as well as sliding angles of about 5°and 3°, respectively. This method may be used to fabricate various microstructured ZnO surfaces showing superhydrophobicity at a low cost.

Key words: Hydrothermal reaction, Superhydrophobicity, Zinc oxide, Zn foil, Fluoroalkylsilane modification