Title

Spatially-resolved structure and electronic properties of graphene on polycrystalline Ni

Abstract

We have used in situ low-energy electron microscopy (LEEM) to correlate the atomic and electronic structure of graphene films on polycrystalline Ni with nm-scale spatial resolution. Spatially resolved electron scattering measurements show that graphene monolayers formed by carbon segregation do not support the pi-plasmon of graphene, indicating strong covalent bonding to the Ni. Graphene bilayers have the Bernal stacking characteristic of graphite and show the expected plasmon loss at 6.5 eV. The experimental results, in agreement with first-principles calculations, show that the pi-band structure of free-standing graphene appears only in films with a thickness of at least two layers and demonstrate the sensitivity of the plasmon loss to the electronic structure.

Department

Physics

Publication Date

11-9-2010

Journal Title

Acs Nano

Publisher

AMER CHEMICAL SOC

Digital Object Identifier (DOI)

10.1021/nn102167f

Document Type

Article

Rights

Copyright © 2010 American Chemical Society

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