Vacuum Magnetic Filtered Arc Deposition Of Amorphous Diamond Films And Their Application In The Field Of Biomedical Materials Research

With the goal to prepare hlgh quality amorphous Diamond (a-D) thin films, afiltered arc deposition (FAD) system has been optimized A radio-frequency substratebias system has been added for depositing thin films on insulators Films can bedeposited at around 77K With setting-up of a liquid-nitrogen cooling system Afilaxnentless ion source has been appended to the FAD machine, as a consequence, ionbeam assisted deposition and doping, particularly with oxygen, can be performed withthe FAD apparatusVery dense, hydrogen free amorphous Diamond thin films have been successfullydepos1ted on insulating substrates at room temperature The moisture permeability ofthe films has been studied by accelerated experimeots The results showed the filmshave high water permeation resistance with the moisture permeating ratio less than thatof silicon niride films, which were often used as waer-block layer in electronic devicepackaging The preliminary results helped us to get a national hi-tech project tocontinue the research for the final application of the a-D thin films in encapsulation ofOrganic Light-Emitting Diode (OLED)As a major work of this thesis, blood compatibility of the amorphous Diamondfilms has been investigated The hemolysis rate expermental results showed that thea-D films almost have no globulicidal effect on blood Compared with low temperatureisotropic pyrolytic carbon (LTI-carbon), which is being used as the material for artificialheart valves in clinic at present, the hurnan serum albumin (HSA) and human fibrinogen(HFG) competition adsorption results revealed that the a-D films adsorbed more HSAand less HFG, which implies the FAD a-D films have a better protein adsorptioncapability The platelet adhesion results demonstrated less platelets were adhered on thea-D films, and the pseudopodium and aggregation of the platelets on the a-D films weremuch slight than those on the LTI-carbon The hemolysis rate, protein adsorption andAbstractplatelet adhesIon expenments lndlcated the blood compatlblllty of the FAD a-D thlnfilms ls suPenor to that of LTI-carbon In order to understand the observed bloodcompatlblllty results, the surface energy of the films was evaluated Howevef, 1t wasfOund that the a-D film ls ldentlcal to LTI-carbon ln lnierfac1al tenslon wlth protelns Itls belleved that effectlve work functlon of the matenals could be a reason for theobserved vanatlons ln blood compatlblllty between a-D films and LTI-carbon...