Molecular beam growth of graphene nanocrystals on dielectric substrates

Details Molecular beam growth of graphene nanocrystals on dielectric substrates Molecular beam growth of graphene nanocrystals on dielectric substrates

2012-02-14

arxiv.org/abs/1202.2905v1

Physics

Condensed Matter

Materials Science

20 pages, 6 figures

Scientific paper

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 favor the formation of higher quality, larger size multi-layer graphene crystallites on all investigated substrates. The surface morphology is determined by the roughness of the underlying substrate and graphitic monolayer steps are observed by ambient scanning tunneling microscopy.

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