Growing hydrophobicity on a smooth copper oxide thin film at room temperature and reversible wettability transition

Sheng Hung Tu, Hsing Chen Wu, Cyuan Jhang Wu, Shao Liang Cheng, Yu Jane Sheng, Heng Kwong Tsao

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The thin CuO film is acquired by a quick dip of copper in H 2 O 2 solutions at room temperature. The CuO film appears smooth and exhibits superhydrophilic nature. The composition change cannot be verified by X-ray photoelectron spectroscopy but can be manifested by the water contact angle. In the ambient condition, the thickness of the oxidized layer and the surface hydrophobicity grow gradually, while the chemical composition of the overall oxidized film remains essentially unchanged. In the vacuum, the growth rate of the hydrophobicity is significantly elevated, revealing deoxidation on the upmost surface. Our results indicate that growing hydrophobicity on the CuO film is spontaneous and the reversible wettability transition can be observed by H 2 O 2 oxidation and vacuum deoxidation.

Original languageEnglish
Pages (from-to)88-92
Number of pages5
JournalApplied Surface Science
Volume316
Issue number1
DOIs
StatePublished - 2014

Keywords

  • Growing hydrophobicity
  • Reversible wetting transition
  • Smooth CuO film
  • Superhydrophilicity

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