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Evolution of Graphene Growth on Pt(111): From Carbon Clusters to Nanoislands
journal contribution
posted on 2017-10-25, 00:00 authored by Hyo Won Kim, Wonhee Ko, JiYeon Ku, Yousoo Kim, Seongjun Park, Sungwoo HwangWe
study the growth of graphene on a Pt(111) surface in stages
by varying the annealing temperature of the precursor hydrocarbon
decomposition through an atomic-scale analysis using scanning tunneling
microscopy (STM) and studying the geometry-affected electronic properties
of graphene nanoislands (GNs) through scanning tunneling spectroscopy.
STM reveals that graphene grows on a Pt(111) surface from dome-shaped
carbon clusters to flat GNs with the intermediate stages of dome-shaped
and basin-shaped hexagonal GN structures. Density functional theory
calculations confirm the changes in direction of the concavity upon
increase in the size of the GNs. The structural changes are also found
to have a significant effect on the electronic properties. Landau
levels arise from strain-induced pseudomagnetic fields because of
the large curvature, and the nanoscale-size effect promotes electron
confinement.
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atomic-scale analysisPtstrain-induced pseudomagnetic fieldsGraphene Growthsurfacetheory calculationsannealing temperaturescanning tunneling spectroscopyelectron confinementCarbon Clustersscanning tunneling microscopygraphene nanoislandsprecursor hydrocarbon decompositionGN structuresSTMlandau levelsdome-shaped carbon clustersnanoscale-size effect
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