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Structure of epitaxial graphene Moiré coincidence network

AuthorsMerino, Pablo; Martínez, José I. ; Otero, Gonzalo ; Martín-Gago, José A.
Issue Date2015
CitationEuropean Conference on Surface Crystallography and Dynamics (2015)
AbstractEpitaxial graphene can be efficiently grown on transition metal surfaces leading to the formation of coincidence superstructures (Moirés) exhibiting different sizes and orientations with respect to the substrate. In this work we aim to understand the modification of the graphene atomic and electronic properties induced by the interaction with the underlying surface. Firstly, we will address the problem of how many Moirés superstructures can be accommodated on a particular metal surface. To this goal, we have grown submonolayer coverage of multi-domain epitaxial graphene islands on Pt(111) by low-temperature decomposition of large organic precursors [1] and observed them by STM. We present a purely simple geometric model that predicts that graphene can only growat those angles at which the mismatch between the graphene and the metal networks is minimized [2]. This model was developed for the case of Pt(111), and successfully applied to other metals and found to work with most substrates [3]. However, there are several aspects that remain unclear, as why the mismatch, and not the strain, is ruling the stability of these structures. We have performed full DFT calculations that lead us to the conclusion that for all reported Moirés the system relaxes inducing a non-negligible atomic corrugation both, at the graphene and at the outermost platinum layer[4].
DescriptionOral presentation given at the European Conference on Surface Crystallography and Dynamics (ECSCD-12), held in Triaste (Italy) on October 18-21th, 2015.
Appears in Collections:(ICMM) Comunicaciones congresos
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