Rotation misorientated graphene moiré superlattices on Cu (1 1 1)

Classical molecular dynamics simulations and scanning tunneling microscopy studies

P. Süle, M. Szendro, C. Hwang, L. Tapasztó

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Graphene on copper is a system of high technological relevance, as Cu is one of the most widely used substrates for the CVD growth of graphene. However, very little is known about the details of their interaction. One approach to gain such information is studying the superlattices emerging due to the mismatch of the two crystal lattices. However, graphene on copper is a low-corrugated system making both their experimental and theoretical study highly challenging. Here, we report the observation of a new rotational moiré superlattice of CVD graphene on Cu (1 1 1), characterized by a periodicity of (1.5±0.05) nm and corrugation of (0.15±0.05) Å, as measured by scanning tunneling microscopy (STM). To understand the observed superlattice we have developed a newly parameterized Abell-Tersoff potential for the graphene/Cu (1 1 1) interface fitted to nonlocal van der Waals density functional theory (DFT) calculations. The interfacial force field with time-lapsed classical molecular dynamics (CMD) provides superlattices in good quantitative agreement with the experimental results, for a misorientation angle of (10.4±0.5°), without any further parameter adjustment. Furthermore, the CMD simulations predict the existence of two non-equivalent high-symmetry directions of the moiré pattern that could also be identified in the experimental STM images.

Original languageEnglish
Pages (from-to)1082-1089
Number of pages8
JournalCarbon
Volume77
DOIs
Publication statusPublished - 2014

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Superlattices
Scanning tunneling microscopy
Graphene
Molecular dynamics
Computer simulation
Copper
Chemical vapor deposition
Crystal lattices
Density functional theory
Substrates

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

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title = "Rotation misorientated graphene moir{\'e} superlattices on Cu (1 1 1): Classical molecular dynamics simulations and scanning tunneling microscopy studies",
abstract = "Graphene on copper is a system of high technological relevance, as Cu is one of the most widely used substrates for the CVD growth of graphene. However, very little is known about the details of their interaction. One approach to gain such information is studying the superlattices emerging due to the mismatch of the two crystal lattices. However, graphene on copper is a low-corrugated system making both their experimental and theoretical study highly challenging. Here, we report the observation of a new rotational moir{\'e} superlattice of CVD graphene on Cu (1 1 1), characterized by a periodicity of (1.5±0.05) nm and corrugation of (0.15±0.05) {\AA}, as measured by scanning tunneling microscopy (STM). To understand the observed superlattice we have developed a newly parameterized Abell-Tersoff potential for the graphene/Cu (1 1 1) interface fitted to nonlocal van der Waals density functional theory (DFT) calculations. The interfacial force field with time-lapsed classical molecular dynamics (CMD) provides superlattices in good quantitative agreement with the experimental results, for a misorientation angle of (10.4±0.5°), without any further parameter adjustment. Furthermore, the CMD simulations predict the existence of two non-equivalent high-symmetry directions of the moir{\'e} pattern that could also be identified in the experimental STM images.",
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AU - Tapasztó, L.

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