NDLI: Wettability of Amorphous Diamond-Like Carbons Deposited on Si and PMMA in Pulse-Modulated Plasmas

Content Provider	IEEE Xplore Digital Library
Author	Ta-Lun Sung Yang, J.H.-C. Teii, K. Teii, S. Chung-Ming Liu Wan-Yu Tseng Li-Deh Lin Ono, S.
Copyright Year	1973
Abstract	Pulse-modulated direct-current methane plasmas are used to deposit amorphous diamond-like carbon films on Si and dentistry-use polymethyl methacrylate (PMMA) substrates as a function of the negative pulse voltage applied to the substrate (V_max). The films on PMMA show a transition from diamond-like to more graphitic carbon in the Raman spectra with increasing V_max, dissimilar to those on Si. This is attributed to easy deformation of PMMA, leading to the low compressive stress of the films (1 to 2 GPa). The contact angle of water for the films on both Si and PMMA is large, ranging from 79° to 94° almost independent of V_max, confirming that the films are hydrophobic despite the difference in carbon bonding state. The large dispersion component (41-43 mJ/m²) of the surface free energy of the films measured from the contact angle of water and 1-bromonaphthalene indicates the high mass density of the films. The small polar component (0.2-3.5 mJ/m²) is attributed to hydrogen saturation of the surface sites forming nonpolar C-H bonds and, thus, responsible for the hydrophobic behavior.
Sponsorship	IEEE Nuclear and Plasma Sciences Society
Starting Page	1837
Ending Page	1842
Page Count	6
File Size	588188
File Format	PDF
ISSN	00933813
Volume Number	40
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-07-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Silicon Diamond-like carbon Plasmas Substrates Rough surfaces Surface roughness Carbon wettability Amorphous carbon biomedical coating chemical vapor deposition (CVD) diamond-like carbon (DLC) optical emission polymethyl methacrylate (PMMA) pulse
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Condensed Matter Physics

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