Influence of bias voltage on diamond like carbon (DLC) film deposited onpolyethylene terephthalate (PET) film surfaces using PECVD and itsblood compatibility

摘要

In this paper, diamond like carbon (DLC) films were coated on polyethylene terephthalate (PET) filmsubstrate as a function of biasing voltage using plasma enhanced chemical vapour deposition. The surfacemorphology of the DLC films was analyzed by scanning electron microscopy and atomic force microscopy.The chemical state and structure of the films were analyzed by X-ray photoelectrons spectroscopy andRaman spectroscopy. The micro hardness of the DLC films was also studied. The surface energy of interfacialtension between the DLC and blood protein was investigated using contact angle measurements. In addition,the blood compatibility of the films was examined by in vitro tests. For a higher fraction of sp~3 content,maximum hardness and surface smoothness of the DLC films were obtained at an optimized biasingpotential of —300 V. The in vitro results showed that the blood compatibility of the DLC coated PET filmsurfaces got enhanced significantly.