Antibacterial Activity of Pyrolytic Carbon Implanted by Copper Ions

The antibacterial properties of pyrolytic carbon implanted by copper ions was investigated using Gram positive Staphylococcus aurcus(S.aurcus) and Gram negative Escherichia coli(E.coli). The pyrolytic carbon samples were implanted by copper ions with the dose ranging from 5×1014 to 1×1018 ion·cm-2 at the energy of 70 keV. The results showed that Cu2+-implanted pyrolytic carbon demonstrated good antibacterial property against S.aurcus and E.coli. The bactericidal ratio for both S.aurcus and E.coli increases with the ion dose when the silver ion dose was under saturation dose 1×1018 ion·cm-2. When copper ions approached saturation dose,the sample show the highest antibacterial ratio. The distribution of copper ions in the pyrolytic carbon was analyzed by RBS(Rutherford backscattering spectrometry),and the antibacterial mechanism of copper ions was discussed initially.