Dynamic annealing effects under high-fluence ion irradiation of glassy carbon

Abstract

The ion induced modification of the structure and morphology of low-temperature (SU-1300) and high-temperature (SU-2500) glassy carbons after high-fluence (≥1018 cm−2) irradiation with 30 keV Ar+ ion in the temperature range from 60 to 600 °C are presented and discussed. Raman spectra show an amorphized state of surface both for the low and high-temperature glassy carbons at an irradiation temperature below the temperature of the dynamic annealing of radiation damage, determined by the temperature dependence of the ion-induced electron emission yield; a graphite-like structure at 140 ≤ Т ≤ 350°С for SU-1300 and at 140 ≤ Т ≤ 250°С for SU-2500; a structure similar to non-irradiated low-temperature glassy carbon at 350 <Т ≤ 600°С and 250 <Т ≤ 600°С for low- and high-temperature glassy carbons, respectively. In both cases, ion irradiation leads to the temperature-dependent changes in the topography of the modified layer. Ion irradiation under conditions of the dynamic annealing of radiation damage leads to a network topography of the nanowalls.