Study on irradiation repair of graphene with a crack

Due to the restrictions in graphene manufacturing process, the presence of defects in graphene structures is almost inevitable and these defects can affect its excellent mechanical properties. In this paper, we study the reparation of cracked graphene by C ion irradiation. Molecular dynamics (MD) simulations are carried out to study the performance of graphene with a pre-crack which is irradiated by C ions. First, the reparation mechanism of defect graphene is investigated. The tensile properties of pristine graphene and graphene with a crack are simulated and compared for the cases of irradiation and without irradiation. The simulation results demonstrate that the irradiation can be used to repair the crack in graphene and can improve its mechanical properties. It means that the reparation of defective graphene with irradiation is feasible. The influences of the ion dose and ion energy on the irradiation reparation are analyzed. We found that both ion dose and ion energy have important influences on the ...