Abstract
Graphene/Cu composites are promising materials for future electrodes because of their mechanical, electrical, and thermal stability. However, the presence of graphene accelerates oxidation of the underlying Cu surface, which affects the various properties of graphene/Cu composites. Therefore, investigating the effects of Cu oxidation on the interfacial properties of graphene/Cu composite is critical. Here, the time-dependent doping and strain of large-area graphene on a Cu surface were analyzed through characterization of both the degree of oxidation and the crystallographic orientation of Cu using Raman spectroscopy. Moreover, we proposed a model for describing the Fermi level of graphene depending on the state of the Cu, such as its crystallographic orientation and degree of surface oxidation.
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