Microscopy study reveals metal-dependent attraction and repulsion across graphene layers, suggesting novel pathways for designing nanoscale electronic architectures.
We employ ultra-high vacuum electron microscopy to investigate the interaction of metal nanoparticles through graphene. The nanoparticles attract those on the other side of graphene in the systems of Ag/graphene/Ag and Cu/graphene/Cu. In contrast, the system of Au/graphene/Au manifests the repelling interaction. Our density functional theory calculations demonstrate that for lower electron-affinity metals such as Cu and Ag, the clusters on opposite sides of graphene prefer the same site to share the electron-loss and reduce the energy. While for higher electron-affinity metals such as Au, they prefer to stay away from the clusters on the other side of graphene.
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Huang et al. (2020) studied this question.
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