Molecular beam growth of graphene nanocrystals on dielectric substrates
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 sp 2 hybridized hexagonal carbon lattice in the nanocrystals. Lower growth rates (below 0.5 /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 ) and graphitic monolayer steps are observed by ambient scanning tunneling microscopy. © 2012 Elsevier Ltd. All rights reserved.
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Wurstbauer, Ulrich; Schiros, Theanne; Jaye, Cherno; Plaut, Annette S.; He, Rui; Rigosi, Albert; Gutiérrez, Christopher; Fischer, Daniel; Pfeiffer, Loren N.; Pasupathy, Abhay N.; Pinczuk, Aron; and Garcia, Jorge M., "Molecular beam growth of graphene nanocrystals on dielectric substrates" (2012). Faculty Publications. 1732.