Abstract
Fluorinated diamond-like carbon (F-DLC) films were deposited on polytetrafluoroethylene (PTFE) using radio frequency (RF) plasma-enhanced chemical vapor deposition (CVD) by changing the ratio of tetrafluoromethane (CF4) and methane (CH4). To enhance the adhesion strength of the F-DLC to the PTFE substrate, the PTFE surface was modified with a N2 plasma pre-treatment. In the pull-out test, the strength of the F-DLC film without the N2 plasma pre-treatment increased with the CF4 ratio. In contrast, in the case with the N2 plasma pre-treatment, the adhesion strength of the F-DLC film decreased with an increasing CF4 ratio. Regarding the adsorption of albumin and γ-globulin, the amount of adsorbed albumin on the film decreased with an increasing CF4 ratio, and the amount of adsorbed γ-globulin increased with the CF4 ratio. The CF4-0% DLC film showed the most adsorbed albumin and the least adsorbed γ-globulin. This result suggests that the DLC film without fluorine had better antithrombogenecity than the F-DLC film.
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