Journal
APPLIED SURFACE SCIENCE
Volume 458, Issue -, Pages 183-190Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.07.061
Keywords
Atmospheric pressure plasma jet (APPJ); OH density; Absorption spectroscopy; X-ray photoelectron spectroscopy; Surface modification
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Funding
- National Natural Science Foundation of China (NSFC) [51407020]
- National Key Technology Research and Development Program of the Ministry of Science and Technology of China [2014BAC13B05]
- Fundamental Research Funds for the Central Universities [2018CDQYDQ0004]
- Key Research and Development Plan of Science & Technology Department of Sichuan Province [2017GZ0094]
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Currently, many kinds of plasma jets are used for enhancing the hydrophilicity of polytetrafluoroethylene (PTFE) attributed to the key radical OH by reaction with water. In order to increase the products of OH, the ambient humidity is regulated instead of working gas to avoid the instability of discharge in this paper. And the relationship of hydrophilicity, ambient humidity and OH density coupled with the Ar plasma jet characteristics is investigated. The results show that at water content of 6 mg/L, the electron excitation temperature and the argon metastable reach the peak value. Thus, the OH density reaches maximum of 4 x 10(15)cm(-3), whereas O atoms diminish gradually. Under this condition, more O-polar groups are injected into the surface because of the high production of OH, implying the dominant radical in the surface treatment of PTFE At the same time, the etching effect of the plasma is the strongest. Thus, the smallest contact angle is reduced to 37 degrees. While Oh product at water content of 2.3 mg/L is higher than that of 9.5 mg/L, the contact angle of the former is larger because of the etching effect.
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