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Raman spectroscopy of lattice-matched graphene on strongly interacting metal surfaces

AuthorsUsachov, Dmitry Yu.; Davydov, Valery Yu.; Levitskii, Vladimir S.; Shevelev, Viktor O.; Marchenko, Dmitry; Senkovskiy, Boris V.; Vilkov, Oleg Yu.; Rybkin, Artem G.; Yashina, Lada V.; Chulkov, Eugene V. ; Sklyadneva, Irina Yu.; Heid, Rolf; Bohnen, Klaus-Peter; Laubschat, Clemens; Vyalikh, Denis V.
Raman spectroscopy
Electronic structure
Issue Date2017
PublisherAmerican Chemical Society
CitationACS Nano 11(6): 6336-6345 (2017)
AbstractRegardless of the widely accepted opinion that there is no Raman signal from single-layer graphene when it is strongly bonded to a metal surface, we present Raman spectra of a graphene monolayer on Ni(111) and Co(0001) substrates. The high binding energy of carbon to these surfaces allows formation of lattice-matched (1 × 1) structures where graphene is significantly stretched. This is reflected in a record-breaking shift of the Raman G band by more than 100 cm–1 relative to the case of freestanding graphene. Using electron diffraction and photoemission spectroscopy, we explore the aforementioned systems together with polycrystalline graphene on Co and analyze possible intercalation of oxygen at ambient conditions. The results obtained are fully supported by Raman spectroscopy. Performing a theoretical investigation of the phonon dispersions of freestanding graphene and stretched graphene on the strongly interacting Co surface, we explain the main features of the Raman spectra. Our results create a reliable platform for application of Raman spectroscopy in diagnostics of chemisorbed graphene and related materials.
Identifiersdoi: 10.1021/acsnano.7b02686
issn: 1936-0851
e-issn: 1936-086X
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