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Sliding friction of graphene/hexagonal –boron nitride heterojunctions: a route to robust superlubricity

The origin of ultra-low friction exhibited by heterogeneous junctions of graphene and hexagonal boron nitride (h-BN) is revealed. For aligned interfaces, we identify a characteristic contact size, below which the junction behaves like its homogeneous counterparts with friction forces that grow linea...

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Detalles Bibliográficos
Autores principales: Mandelli, D., Leven, I., Hod, O., Urbakh, M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5589749/
https://www.ncbi.nlm.nih.gov/pubmed/28883489
http://dx.doi.org/10.1038/s41598-017-10522-8
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author Mandelli, D.
Leven, I.
Hod, O.
Urbakh, M.
author_facet Mandelli, D.
Leven, I.
Hod, O.
Urbakh, M.
author_sort Mandelli, D.
collection PubMed
description The origin of ultra-low friction exhibited by heterogeneous junctions of graphene and hexagonal boron nitride (h-BN) is revealed. For aligned interfaces, we identify a characteristic contact size, below which the junction behaves like its homogeneous counterparts with friction forces that grow linearly with the contact area. Superlubricity sets in due to the progressive appearance of Moiré patterns resulting in a collective stick-slip motion of the elevated super-structure ridges that turns into smooth soliton-like gliding with increasing contact size. Incommensurability effects are enhanced in misaligned contacts, where the friction coefficients further drop by orders of magnitude. Our fully atomistic simulations show that the superlubric regime in graphene/h-BN heterostructures persists up to significantly higher loads compared to the well-studied twisted homogeneous graphene interface. This indicates the potential of achieving robust superlubricity in practical applications using two-dimensional layered materials heterojunctions.
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spelling pubmed-55897492017-09-13 Sliding friction of graphene/hexagonal –boron nitride heterojunctions: a route to robust superlubricity Mandelli, D. Leven, I. Hod, O. Urbakh, M. Sci Rep Article The origin of ultra-low friction exhibited by heterogeneous junctions of graphene and hexagonal boron nitride (h-BN) is revealed. For aligned interfaces, we identify a characteristic contact size, below which the junction behaves like its homogeneous counterparts with friction forces that grow linearly with the contact area. Superlubricity sets in due to the progressive appearance of Moiré patterns resulting in a collective stick-slip motion of the elevated super-structure ridges that turns into smooth soliton-like gliding with increasing contact size. Incommensurability effects are enhanced in misaligned contacts, where the friction coefficients further drop by orders of magnitude. Our fully atomistic simulations show that the superlubric regime in graphene/h-BN heterostructures persists up to significantly higher loads compared to the well-studied twisted homogeneous graphene interface. This indicates the potential of achieving robust superlubricity in practical applications using two-dimensional layered materials heterojunctions. Nature Publishing Group UK 2017-09-07 /pmc/articles/PMC5589749/ /pubmed/28883489 http://dx.doi.org/10.1038/s41598-017-10522-8 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Mandelli, D.
Leven, I.
Hod, O.
Urbakh, M.
Sliding friction of graphene/hexagonal –boron nitride heterojunctions: a route to robust superlubricity
title Sliding friction of graphene/hexagonal –boron nitride heterojunctions: a route to robust superlubricity
title_full Sliding friction of graphene/hexagonal –boron nitride heterojunctions: a route to robust superlubricity
title_fullStr Sliding friction of graphene/hexagonal –boron nitride heterojunctions: a route to robust superlubricity
title_full_unstemmed Sliding friction of graphene/hexagonal –boron nitride heterojunctions: a route to robust superlubricity
title_short Sliding friction of graphene/hexagonal –boron nitride heterojunctions: a route to robust superlubricity
title_sort sliding friction of graphene/hexagonal –boron nitride heterojunctions: a route to robust superlubricity
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5589749/
https://www.ncbi.nlm.nih.gov/pubmed/28883489
http://dx.doi.org/10.1038/s41598-017-10522-8
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