Modification of Graphite Surface by Intense Pulsed Ion-beam Irradiation

摘要

Surface modification has been carried out of graphite targets irradiated by intense pulsed ion beam. The highly oriented pyrolytic graphite ( HOPG ) targets were irradiated by 70-120 J/cm~2 of pulsed ion beams. To evaluate temperature on the irradiated surface, the deposited energy was measured by using the thermistors attached on the back of the targets. The fast heating and fast quenching occurred on the target surface, which were enhanced at the higher energy density of beam irradiation. On the irradiated surfaces, sphere particles and whiskers were found by scanning electron microscope observations. By Raman spectroscopy, structural changes were confirmed on the irradiated surfaces and the intensity ratio of a peak at 1360 cm~(-1) to that at 1580 cm~(-1) was increased with increasing the ion beam energy density.