Bactericidal properties of silver implanted pyrolytic carbon

The results show that the bactericidal ratio increases with the ion dose when silver ion dose under the saturated dose of 5 × 1017 ions/cm2. The bactericidal ratio is over 97% when the ion dose exceeds that. RBS analysis shows that the silver atoms penetrate into the sample surface and forms a Gaussian-like distribution in pyrolytic carbon substrate. The sputtering effect is helpful to form a silver-rich surface region which plays an important role to kill bacteria. XRD analysis shows that silver mainly existed in (1 1 1), (2 0 0), (3 1 1) crystal plane in accordance with the fcc crystal structure. SEM characterization shows that the surface morphology also important for killing germs.