Journal
APPLIED SURFACE SCIENCE
Volume 258, Issue 20, Pages 8094-8099Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2012.04.178
Keywords
Diamond like carbon; Haemocompatibility; PTFE
Categories
Funding
- Canada Research Chair Program
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation (CFI) grant
- NSERC
- NRC
- CIHR
- University of Saskatchewan
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Diamond-like carbon (DLC) and N-doped DLC (DLC:N) thin films have been synthesized on polytetrafluroethylene (PTFE) and silicon wafers using ion beam deposition. Raman spectroscopy, atomic force microscopy, X-ray photoelectron spectroscopy and scanning electron microscopy were used to study the structural and morphological properties of the coated surface. The results show that the ion beam deposited DLC thin films exhibit high hardness and Young's modulus, low coefficient of friction and high adhesion to the substrate. Low concentration of nitrogen doping in DLC improves the mechanical properties and reduces the surface roughness. DLC coating decreases the surface energy and improves the wettability of PTFE. The platelet adhesion results show that the haemocompatibility of DLC coated PTFE, especially DLC:N coated PTFE, has been significantly enhanced as compared with uncoated PTFE. SEM observations show that the platelet reaction on the DLC and DLC:N coated PTFE was minimized as the platelets were much less aggregated and activated. (c) 2012 Elsevier B.V. All rights reserved.
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