Molecular beam growth of graphene nanocrystals on dielectric substrates
Wurstbauer, Ulrich; Schiros, Theanne; Jaye, Cherno; et al.Plaut, Annette S.; He, Rui; Rigosi, Albert; Gutierrez, Christopher; Fischer, Daniel; Pfeiffer, Loren N.; Pasupathy, Abhay N.; Pinczuk, Aron; Garcia, Jorge M.
Date: 13 June 2012
Article
Journal
Carbon
Publisher
Elsevier
Publisher DOI
Abstract
We demonstrate the growth of graphene nanocrystals by molecular beam methods that employ a solid carbon source, and that can be used on a diverse class of large area dielectric substrates. Characterization by Raman and near edge X-ray absorption fine structure spectroscopies reveal a sp2 hybridized hexagonal carbon lattice in the ...
We demonstrate the growth of graphene nanocrystals by molecular beam methods that employ a solid carbon source, and that can be used on a diverse class of large area dielectric substrates. Characterization by Raman and near edge X-ray absorption fine structure spectroscopies reveal a sp2 hybridized hexagonal carbon lattice in the nanocrystals. Lower growth rates (below 0.5 Å/min) favor the formation of layered, larger size multi-layer graphene crystallites (up to 22 nm) on all investigated substrates. The surface morphology is determined by the roughness of the underlying substrate (RMS ∼8 Å) and graphitic monolayer steps are observed by ambient scanning tunneling microscopy.
Physics and Astronomy
Faculty of Environment, Science and Economy
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