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Improvement of Hydrophilic Stability of Diamond-Like Carbon Films by O2/CF4 Plasma Post-Treatment

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Abstract:

In this article, the results obtained from a study carried out on the plasma post-treatment of diamond-like carbon (DLC) films using an oxygen/tetrafluoromethane (O2/CF4) gas mixture is reported. The surface morphology and chemical bonding of the films before and after the plasma post-treatment were characterized using atomic force microscopy (AFM) and attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy. The effect of adding CF4 to the O2 plasma on the wettability of the films was also examined using contact angle measurements. The results indicate that the surface roughness increased with the addition of CF4 to the O2 plasma, whereas oxygen-and fluorinated-based functional groups were generated on the surface of the DLC films submitted to O2/CF4 plasma post-treatment. The surface energy also decreased with increasing CF4 fraction, causing the surface of the films to be hydrophobic. Furthermore, the films containing 20% CF4 exhibited higher hydrophilic stability than the others. Thus, the addition of a small amount of CF4 to O2 plasma can be considered beneficial in improving the hydrophilic stability of surface of DLC films.

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Periodical:

Advanced Materials Research (Volume 1125)

Pages:

38-44

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1125.38

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Online since:

October 2015

Authors:

Chavin Jongwannasiri*, Shuichi Watanabe

Keywords:

Diamond-Like Carbon, Hydrophilic, O2/CF4 Plasma, Wettability

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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