EFFECTS OF AR-ION IMPLANTATION ON THE SURFACE-STRUCTURE OF PYROLYTIC-GRAPHITE

Effects of Ar-ion implantation on the surface structure of a pyrolytic graphite (PG) have been investigated by means of the laser Raman spec troscopy and X-ray photoelectron spectroscopy (XPS). The implantation was conducted to both the basal and edge surfaces, whereby the carbon lattice was destroyed so as to form an amorphous structure at the flue nce level of 2.3 x 10(16) ions cm(-2). A new asymmetric Raman band was produced around 1200-1300cm(-1) for the edge surface at 1.0 x 10(17) ions cm(-2). The atomic ratio of XPS O/C of the edge surface was not a ppreciably changed by the bombardment between 1.0 x 10(14) and 1.0 x 1 0(15) ions m(-2). The outermost structure of the edge surface seems to be less damaged at these fluence levels than that of the basal surfac e.