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- Title
Growth of a two-dimensional dielectric monolayer on quasi-freestanding graphene.
- Authors
Addou, Rafik; Dahal, Arjun; Batzill, Matthias
- Abstract
Integrating graphene into device architectures requires interfacing graphene with dielectric materials. However, the dewetting and thermal instability of dielectric layers on top of graphene makes fabricating continuous graphene/dielectric interfaces challenging. Here, we show that yttria (Y2O3)-a high-? dielectric-can form a complete monolayer on platinum-supported graphene. The monolayer interacts weakly with graphene, but is stable to high temperatures. Scanning tunnelling microscopy reveals that the yttria layer exhibits a two-dimensional hexagonal lattice rotated by 30° relative to the hexagonal graphene lattice. X-ray photoemission spectroscopy measurements indicate a shift of the Fermi level in graphene on yttria deposition, which suggests that dielectric layers could be used for charge doping of metal-supported graphene.
- Subjects
ELECTRIC properties of graphene; DIELECTRIC devices; THERMAL instability; ELECTRIC properties of monomolecular films; TUNNELING spectroscopy; X-ray photoelectron spectroscopy; CRYSTAL lattices
- Publication
Nature Nanotechnology, 2013, Vol 8, Issue 1, p41
- ISSN
1748-3387
- Publication type
Article
- DOI
10.1038/nnano.2012.217