Abstract: Amorphous carbon(a-C) and La2O3 doped a-C films were deposited on silicon substrates using a Radio-Frequency magnetron sputtering. The effect of doped rare earth on the microstructure,composition,surface morphology and hydrophilicity of a-C films were studied using scanning electron microscopy(SEM) ,X-ray photoelectron spectroscopy(XPS) and contact angle test,respectively. The blood compatibility of the specimens was evaluated tests of platelet adhesion. The results show that La2O3 doped a-C film can posses...