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Conversion of multilayer graphene into continuous ultrathin sp 3-bonded carbon films on metal surfaces

Author(s)
Odkhuu, DorjShin, DongbinRuoff, Rodney S.Park, Noejung
Issued Date
2013-11
DOI
10.1038/srep03276
URI
https://scholarworks.unist.ac.kr/handle/201301/2794
Fulltext
https://www.nature.com/articles/srep03276
Citation
SCIENTIFIC REPORTS, v.3, pp.3276
Abstract
The conversion of multilayer graphenes into sp 3-bonded carbon films on metal surfaces (through hydrogenation or fluorination of the outer surface of the top graphene layer) is indicated through first-principles computations. The main driving force for this conversion is the hybridization between sp 3 orbitals and metal surface d z 2 orbitals. The induced electronic gap states and spin moments in the carbon layers are confined in a region within 0.5â.nm of the metal surface. Whether the conversion occurs depend on the fraction of hydrogenated (fluorinated) C atoms at the outer surface and on the number of stacked graphene layers. In the analysis of the Eliashberg spectral functions for the sp 3 carbon films on a metal surface that is diamagnetic, the strong covalent metal-sp 3 carbon bonds induce soft phonon modes that predominantly contribute to large electron-phonon couplings, suggesting the possibility of phonon-mediated superconductivity. Our computational results suggest a route to experimental realization of large-area ultrathin sp 3-bonded carbon films on metal surfaces.
Publisher
NATURE PUBLISHING GROUP
ISSN
2045-2322

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