Phonon dispersion of quasi-freestanding graphene on Pt(111)

Journal of Physics. Condensed Matter : an Institute of Physics Journal
A PolitanoG Chiarello

Abstract

High-resolution electron energy loss spectroscopy has been used to probe phonon dispersion in quasi-freestanding graphene epitaxially grown on Pt(111). Loss spectra clearly show different dispersing features related to both acoustic and optical phonons. The present results have been compared with graphene systems which strongly interact with the substrate, i.e. the nearly-flat monolayer graphene (MLG)/Ni(111) and the corrugated MLG/Ru(0001). We found that the phonon dispersion of graphene/Pt(111) reproduces well the behavior of pristine graphite. This could be taken as an indication of the negligible interaction between the graphene sheet and the underlying Pt substrate. The softening of out-of-plane modes observed for interacting graphene/metal interfaces does not occur for the nearly-free-standing graphene/Pt(111).

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Citations

Jun 6, 2013·Physical Chemistry Chemical Physics : PCCP·Antonio PolitanoGennaro Chiarello
Jul 16, 2013·Nanoscale·Antonio Politano, Gennaro Chiarello
Aug 21, 2013·The Journal of Chemical Physics·Antonio Politano, Gennaro Chiarello
Feb 8, 2013·The Journal of Chemical Physics·A Politano, G Chiarello
Dec 1, 2015·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Anton TamtöglWilliam Allison
Feb 18, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Amjad Al Taleb, Daniel Farías
Sep 1, 2015·Physical Review Letters·Antonio PolitanoHerbert A Fertig
Aug 6, 2013·Journal of Physics. Condensed Matter : an Institute of Physics Journal·A PolitanoG Chiarello

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