| 초록 |
Graphene has advantages as an oxidation passivation layer. However, it has been contradictorily reported that existence of CVD-grown graphene on copper surface can accelerate and decelerate the oxidation of Cu at room temperature. Herein, we investigated general oxidation mechanism of copper underneath CVD-grown graphene at room temperature to resolve contradictory results. We found that cation diffusion through oxide is rate-determining step of copper oxidation at room temperature and cation diffusion through oxide in graphene/Cu is accelerated by formed cuprous oxide (Cu2O) during oxidation process whereas cation diffusion through oxide in bare Cu is relatively decelerated by formed cupric oxide (CuO). Based on our findings, we systematically investigated oxidation behaviors of defect-controlled graphene-covered copper to demonstrate our proposed mechanism and successfully passivated oxidation of copper using defect-controlled graphene. |
