Control of superhydrophilicity and superhydrophobicity of a superwetting silicon nanowire surface

Cheng Yung Kuo, Chie Gau

研究成果: Article同行評審

18 引文 斯高帕斯(Scopus)

摘要

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.

原文English
期刊Journal of the Electrochemical Society
157
發行號9
DOIs
出版狀態Published - 2010 8月 26

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 可再生能源、永續發展與環境
  • 表面、塗料和薄膜
  • 電化學
  • 材料化學

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