Abstract
Intercalation of metals at a graphene/substrate interface can modify the electronic and vibration properties of the graphene. We investigated the intercalation of Au at the graphene/polycrystalline Ni interface by scanning electron microscopy, transmission electron microscopy, and Raman scattering spectroscopy. Graphene coverage induces step bunching on the poly-crystalline Ni surface. Au intercalation selectively occurs at the graphene/Ni(111) facets and changes the secondary electron contrast as well as recovering intrinsic graphene Raman signals. Au nanoparticles are observed only on the Ni(111) facets and are absent on the narrow step-bunched regions. High-angle annular dark field images indicates the presence of monolayer Au only at the graphene/Ni(111) interface.
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