Abstract:
:Electronic structure heterogeneities are ubiquitous in two-dimensional graphene and profoundly impact the transport properties of this material. Here we show the mapping of discrete electronic domains within a single graphene sheet using scanning transmission X-ray microscopy in conjunction with ab initio density functional theory calculations. Scanning transmission X-ray microscopy imaging provides a wealth of detail regarding the extent to which the unoccupied levels of graphene are modified by corrugation, doping and adventitious impurities, as a result of synthesis and processing. Local electronic corrugations, visualized as distortions of the π*cloud, have been imaged alongside inhomogeneously doped regions characterized by distinctive spectral signatures of altered unoccupied density of states. The combination of density functional theory calculations, scanning transmission X-ray microscopy imaging, and in situ near-edge X-ray absorption fine structure spectroscopy experiments also provide resolution of a longstanding debate in the literature regarding the spectral assignments of pre-edge and interlayer states.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Schultz BJ,Patridge CJ,Lee V,Jaye C,Lysaght PS,Smith C,Barnett J,Fischer DA,Prendergast D,Banerjee Sdoi
10.1038/ncomms1376subject
Has Abstractpub_date
2011-06-28 00:00:00pages
372issn
2041-1723pii
ncomms1376journal_volume
2pub_type
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