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Electronic structure and band-gap modulation of graphene via substrate surface chemistry
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View: Figures


Image of FIG. 1.
FIG. 1.

Graphene sheets above the substrate with O-termination and without H-passivation for (a) the monolayer and (b) the bilayer. The H-passivated system (c) is shown and no covalent bonding between graphene and substrate was observed.

Image of FIG. 2.
FIG. 2.

Charge density plots for oxygen terminated substrate without H-passivation for (a) the monolayer, (b) the bilayer graphene systems, and for (c) the H-passivated monolayer system. Charge transfer to the graphene was observed only to the lowest graphene layer that is covalently interacting with the substrate (Ref. 40).

Image of FIG. 3.
FIG. 3.

Band structure for (a) the graphene monolayer and for (b) the graphene bilayer above substrate without hydrogen passivation of terminal oxygen atoms, as well as for (c) the graphene monolayer above the H-passivated substrate. The addition of the second graphene layer brings back bands near to the Fermi energy, although still with a finite gap. With a single graphene layer and for a metallic band structure similar to freely suspended graphene, H-passivation is required. The Fermi energy is indicated by the dashed line.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electronic structure and band-gap modulation of graphene via substrate surface chemistry