Our recent effort was focused on examination of nanocrystalline diamond layers, synthesized on a metal surfaces, allowing for controllable biocompatibility and bioactivity. The NCD layer was formed in a vacuum reactor chamber by a radio frequency plasma activated chemical vapor decomposition of methane (RF PCVD). This method was pioneered by Mitura and Niedzielski, and currently is subjected to several modifications. Structural and chemical analysis of carbon coating, produced by this method, revealed the presence of nanocrystalline diamond layer (96% pure diamond), apart from other allotropic forms of carbon. About 300-500 nm in thickness the NCD layer smoothly changes into a diffusion interlayer of carbides and the base. The NCD coating exhibits very promising mechanical features and meets very well our expectations in respect to the above described phenomena. Protein deposition and blood platelet adhesion to NCD surface is very significantly reduced, when compared to medical steel, and this coating is also resistant to a microbial colonization. The NCD surface manifests also positive bioactivity accelerating of free radicals decay in blood plasma.

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1. Contact of blood and endithelial cells with surface-modified metallic biomaterials