Wettability of plasma-treated nanocrystalline diamond films

Yang, Jason Hsiao Chun; Teii, Kungen

doi:10.1016/j.diamond.2011.10.023

Cited by 22 publications

(14 citation statements)

References 26 publications

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“…This is evident from the Raman and XPS analysis. The other possibility is that after etching, the surface of the films possess dangling bonds which are readily available for interaction during the sliding event which in turn causes an increase in friction coefficient [23,24]. The film S60 shows friction coefficient of 0.08 which is lower compared to the S15 (0.1) and S30 (0.15) but higher than S0 film (0.05).…”

Section: Contact Anglementioning

confidence: 93%

Tribological properties of chemically modified diamond like carbon films in hydrogen plasma

Polaki

Kumar

Krishna

et al. 2015

Tribology International

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Section: Contact Anglementioning

confidence: 93%

Tribological properties of chemically modified diamond like carbon films in hydrogen plasma

Polaki

Kumar

Krishna

et al. 2015

Tribology International

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“…The large value of γ d is attributed to a high mass density of the films because the dispersion component is closely related to van der Waals force. The values of γ d obtained here are as large as those of microcrystalline and nanocrystalline diamond films [27], [28], indicating a high mass density in our films. Interestingly, for the films on PMMA, the value of γ d remains constant for the change in V max despite a structural change toward more graphitic carbon in the Raman spectra.…”

Section: Resultsmentioning

confidence: 60%

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

Sung

Yang

Teii

et al. 2012

IEEE Trans. Plasma Sci.

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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/m 2 ) 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/m 2 ) is attributed to hydrogen saturation of the surface sites forming nonpolar C-H bonds and, thus, responsible for the hydrophobic behavior.Index Terms-Amorphous carbon, biomedical coating, chemical vapor deposition (CVD), diamond-like carbon (DLC), optical emission, polymethyl methacrylate (PMMA), pulse, wettability.

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“…EDS spectra revealed that the as-deposited film consists of carbon with very small amounts of impurities such as nitrogen and oxygen (~1 at.%) [22]. The hydrogen plasma treatment caused no noticeable change in chemical composition.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Wettability of Nanocrystalline Diamond Films for Biocoating Applications

Yang

Teii

2012

MRS Proc.

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Nanocrystalline diamond (NCD) films are prepared from Ar-rich/N 2 /CH 4 and Arrich/H 2 /CH 4 mixtures by microwave plasma-enhanced chemical vapor deposition, and further treated by microwave hydrogen and oxygen plasma exposures separately to enhance the wetting property. The hydrogen plasma treatment has small effect on the surface roughness, while the oxygen plasma treatment forms fine protrusions on the film surface. Results show that the wettability of the hydrogen plasma treated NCD film is nearly constant or little improvement as the polar component of the apparent surface free energy is close to the as-deposit NCD film. In contrast, the wettability of the oxygen plasma treated NCD film is improved dramatically such that the contact angle is reduced from 92º and 4.7º to almost 0º for water and 1-bromonaphthalene, respectively, and the polar component increases significantly to 34 mJ/m 2 . The low contact angle suggests that the film is considerably a cell adhesive friendly surface, which is essential in maintaining multicellular structure, and thus making it a favorable wetting surface for biological and biomedical applications.

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Wettability of plasma-treated nanocrystalline diamond films

Cited by 22 publications

References 26 publications

Tribological properties of chemically modified diamond like carbon films in hydrogen plasma

Tribological properties of chemically modified diamond like carbon films in hydrogen plasma

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

Enhanced Wettability of Nanocrystalline Diamond Films for Biocoating Applications

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