Control of superhydrophilicity and superhydrophobicity of a superwetting silicon nanowire surface

Cheng Yung Kuo, Chie Gau

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

The superwetting or dewetting properties of a silicon nanowire (SiNW) surface are studied. The SiNW arrays were grown vertically on SiO2 or Si substrates by a vapor-liquid-solid process. After a critical length or roughness, the nanowire surface exhibits superhydrophilic property with a contact angle close to 0°. However, the superhydrophilicity of the surface can be transformed into superhydrophobicity by a vacuum treatment, which is a low pressure diffusion process by the vapor from the polydimethylsiloxane material. In addition, the superhydrophobicity of the surface can be readily reversed back to superhydrophilicity by 600°C anneal with N2 gas flow. The reverse nature of surface wettability can be repeated for many cycles by alternating vacuum with thermal treatment. Physical explanation together with analytical measurements are provided and discussed. The findings have opened a door to completely control the superhydrophilicity or superhydrophobicity of a surface with a very simple and cheap method.

Original languageEnglish
JournalJournal of the Electrochemical Society
Volume157
Issue number9
DOIs
Publication statusPublished - 2010 Aug 26

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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