Molecular beam growth of graphene nanocrystals on dielectric substrates
Plaut, Annette S.
Pfeiffer, Loren N.
Pasupathy, Abhay N.
Garcia, Jorge M.
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.
Copyright © 2012 Elsevier. NOTICE: this is the author’s version of a work that was accepted for publication in Carbon. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Carbon Vol. 50 (2012), DOI: 10.1016/j.carbon.2012.06.008
Vol. 50 (13), pp. 4822 - 4829