Abstract
Diamond-like carbon (DLC) film was prepared on PTFE using a radio frequency (RF) plasma chemical vapor deposition (CVD), and the surface of the DLC film was treated by NH_3 plasma. The adsorption characteristic of heparin (molecular weight 4000) on the DLC film was examined to improve antithrombogenic properties. The deposited film was identified as DLC using Laser Raman analysis. When the DLC film was treated by NH_3 plasma, self-bias degreased with increasing NH_3 pressure. X-ray photoelectron spectroscopy (XPS) analysis showed that the N-H bond increased with degreasing NH_3 pressure. As the result, the DLC film treated by 10Pa-NH_3 plasma adsorbed the largest amount of heparin.
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