Abstract
Reaction-free interface may promote strength-ductility balance in graphene/Al composites benefiting from the tight interfacial bonding, but it is still unknown whether it is realized by physical or diffusion bonding. In this study, in-depth understanding of interface characteristics in graphene/Al composites was studied at an atomic scale in terms of interface composition, configuration and interplanar spacing. It was found that no C and Al atomic inter-diffusion occurred at graphene/Al interface by EELS, and all the Al-C interface spacing was measured in the range of 3–4 Å by HRTEM, in good agreement with the calculation from density functional theory. The interface characteristics were not varied with different interfacial bonding, i.e., physical or reaction bonding. This work provides a new understanding of graphene-Al interface and would promote the development of high-performance graphene/Al composites.
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