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Open Access Publications from the University of California

Functionalization of Hydrogen-free Diamond-like Carbon Films using Open-air Dielectric Barrier Discharge Atmospheric Plasma Treatments

  • Author(s): Endrino, J. L.;
  • Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;
  • Instituto de Materiales de Madrid, C.S.I.C., Cantoblanco, 28049 Madrid, Spain;
  • Instituto de Quimica-Fisica "Rocasolano" C.S.I.C., 28006 Madrid, Spain;
  • Mahasarakham University, Mahasarakham 44150, Thailand;
  • CASTI, CNR-INFM Regional Laboratory, L'Aquila 67100, Italy;
  • SUNY Upstate Medical University, Syracuse, NY 13210, USA
  • et al.

A dielectric barrier discharge (DBD) technique has been employed to produce uniform atmospheric plasmas of He and N2 gas mixtures in open air in order to functionalize the surface of filtered-arc deposited hydrogen-free diamond-like carbon (DLC) films. XPS measurements were carried out on both untreated and He/N2 DBD plasma treated DLC surfaces. Chemical states of the C 1s and N 1s peaks were collected and used to characterize the surface bonds. Contact angle measurements were also used to record the short- and long-term variations in wettability of treated and untreated DLC. In addition, cell viability tests were performed to determine the influence of various He/N2 atmospheric plasma treatments on the attachment of osteoblast MC3T3 cells. Current evidence shows the feasibility of atmospheric plasmas in producing long-lasting variations in the surface bonding and surface energy of hydrogen-free DLC and consequently the potential for this technique in the functionalization of DLC coated devices.

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