2013
DOI: 10.1016/j.carbon.2012.08.050
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Revealing the atomic structure of the buffer layer between SiC(0 0 0 1) and epitaxial graphene

Abstract: On the SiC(0001) surface (the silicon face of SiC), epitaxial graphene is obtained by sublimation of Si from the substrate. The graphene film is separated from the bulk by a carbon-rich interface layer (hereafter called the buffer layer) which in part covalently binds to the substrate. Its structural and electronic properties are currently under debate. In the present work we report scanning tunneling microscopy (STM) studies of the buffer layer and of quasi-free-standing monolayer graphene (QFMLG) that is obt… Show more

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Cited by 145 publications
(155 citation statements)
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“…1). Extrapolation of the band edges reveal an effective gap around 1 eV which is close to the value reported for graphene buffer layers on SiC(0001) 17,18 . STS-measurements taken at different sites within this imperfect area reveal similar spectra, i.e.…”
supporting
confidence: 83%
“…1). Extrapolation of the band edges reveal an effective gap around 1 eV which is close to the value reported for graphene buffer layers on SiC(0001) 17,18 . STS-measurements taken at different sites within this imperfect area reveal similar spectra, i.e.…”
supporting
confidence: 83%
“…Due to abundant hydrophilic group, graphene oxide can be used as biomolecular carriers for drug and gene delivery in biomedical field [12]. Now, the preparation of graphene commonly used physical and chemical methods: micro-mechanical stripping [9], liquid exfoliation [13,14], axial cutting carbon nanotube [15], chemical vapor deposition (CVD) [16,17], crystal epitaxial growth [18] and oxidation-reduction method [19].…”
Section: Graphenementioning
confidence: 99%
“…1. Beside the graphene the sample might consist of some C contamination on its surface and a buffer layer between the pristine SiC and graphene, which is rich in carbon [12] and has a similar structure as the graphene [13]. Thus, the Auger electron emitted by the SiC substrate is attenuated by these three layers, and the signal reaching the detector is proportional to…”
Section: Calculation Of the Auger Electron Intensitiesmentioning
confidence: 99%
“…The intensities of the Auger electrons as a function of depth is calculated based on equations 1 and 2, where the thickness d c is taken to be 0; the contamination C will not be distinguished from the graphene. The density of the buffer layer is equal to that of graphene [13]. The EAL-s were calculated by the software of ref.…”
Section: Simulation Of the Depth Profile Shown Inmentioning
confidence: 99%