Characterization of physical and biomedical properties of nitrogenated diamond-like carbon films coated on polytetrafluoroethylene substrates |
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| Affiliation: | 1. Neutron Metrology Group, National Physical Laboratory, Teddington TW11 0LW, United Kingdom;2. Thermo Fisher Scientific Messtechnik GmbH, Frauenauracher Straße 96, D-91056 Erlangen, Germany;1. Department of Mechanical Engineering, University of Arkansas, Fayetteville, AR 72701, USA;2. Center for Advanced Surface Engineering, University of Arkansas, Fayetteville, AR 72701, USA;3. SurfTec, LLC., Fayetteville, AR 72701, USA;1. Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China;3. School of Physical Science and Technology, ShanghaiTech University, Shanghai, 201210, China;1. Department of Mechanical Engineering, Yonsei University, Seoul, 03722, Republic of Korea;2. ZJU-UIUC Institute, International Campus, Zhejiang University, Haining, 314400, China |
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| Abstract: | A technique to coat hydrogen-free diamond-like carbon (DLC) films on polytetrafluoroethylene (PTFE) substrates has been developed by sputtering of a negatively biased graphite target in a mixture of argon and nitrogen plasma. The coated films were characterized by various methods to investigate their chemical, electronic features, and particularly their biomedical properties. DLC films produced by this method have up to 20% sp3 carbon bonds depending on the nitrogen concentration in the plasma. Raman spectroscopy revealed that, bond-disorder increases with nitrogen doping. The average grain size of DLC decreases in the nitrogen doped samples by almost 30%. The roughness of the uncoated PTFE substrate surfaces decreased dramatically from 660 nm to 170 nm after DLC coating. However, the nitrogen contents in the plasma have little effects on the roughness, the cluster size, and shapes. Electronic band gap of the samples decreases with adding nitrogen from ~ 2 eV in nitrogen-free samples to ~ 1 eV in nitrogenated samples. Lower adhesion and aggregation of platelets on PTFE surfaces coated with DLC-10% nitrogen and DLC-20% nitrogen have been observed while there is greater adhesion of platelets on DLC-30% nitrogen and DLC-40% nitrogen. |
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