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Adhesion toughness of multilayer graphene films

Interface adhesion toughness between multilayer graphene films and substrates is a major concern for their integration into functional devices. Results from the circular blister test, however, display seemingly anomalous behaviour as adhesion toughness depends on number of graphene layers. Here we s...

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Autores principales: Wood, Joseph D., Harvey, Christopher M., Wang, Simon
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5717257/
https://www.ncbi.nlm.nih.gov/pubmed/29208943
http://dx.doi.org/10.1038/s41467-017-02115-w
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author Wood, Joseph D.
Harvey, Christopher M.
Wang, Simon
author_facet Wood, Joseph D.
Harvey, Christopher M.
Wang, Simon
author_sort Wood, Joseph D.
collection PubMed
description Interface adhesion toughness between multilayer graphene films and substrates is a major concern for their integration into functional devices. Results from the circular blister test, however, display seemingly anomalous behaviour as adhesion toughness depends on number of graphene layers. Here we show that interlayer shearing and sliding near the blister crack tip, caused by the transition from membrane stretching to combined bending, stretching and through-thickness shearing, decreases fracture mode mixity G (II)/G (I), leading to lower adhesion toughness. For silicon oxide substrate and pressure loading, mode mixity decreases from 232% for monolayer films to 130% for multilayer films, causing the adhesion toughness G (c) to decrease from 0.424 J m(−2) to 0.365 J m(−2). The mode I and II adhesion toughnesses are found to be G (Ic) = 0.230 J m(−2) and G (IIc) = 0.666 J m(−2), respectively. With point loading, mode mixity decreases from 741% for monolayer films to 262% for multilayer films, while the adhesion toughness G (c) decreases from 0.543 J m(−2) to 0.438 J m(−2).
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spelling pubmed-57172572017-12-08 Adhesion toughness of multilayer graphene films Wood, Joseph D. Harvey, Christopher M. Wang, Simon Nat Commun Article Interface adhesion toughness between multilayer graphene films and substrates is a major concern for their integration into functional devices. Results from the circular blister test, however, display seemingly anomalous behaviour as adhesion toughness depends on number of graphene layers. Here we show that interlayer shearing and sliding near the blister crack tip, caused by the transition from membrane stretching to combined bending, stretching and through-thickness shearing, decreases fracture mode mixity G (II)/G (I), leading to lower adhesion toughness. For silicon oxide substrate and pressure loading, mode mixity decreases from 232% for monolayer films to 130% for multilayer films, causing the adhesion toughness G (c) to decrease from 0.424 J m(−2) to 0.365 J m(−2). The mode I and II adhesion toughnesses are found to be G (Ic) = 0.230 J m(−2) and G (IIc) = 0.666 J m(−2), respectively. With point loading, mode mixity decreases from 741% for monolayer films to 262% for multilayer films, while the adhesion toughness G (c) decreases from 0.543 J m(−2) to 0.438 J m(−2). Nature Publishing Group UK 2017-12-05 /pmc/articles/PMC5717257/ /pubmed/29208943 http://dx.doi.org/10.1038/s41467-017-02115-w 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 Commonslicense, unless indicated otherwise in a credit line to the material. If material is not included in the article’sCreative 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
Wood, Joseph D.
Harvey, Christopher M.
Wang, Simon
Adhesion toughness of multilayer graphene films
title Adhesion toughness of multilayer graphene films
title_full Adhesion toughness of multilayer graphene films
title_fullStr Adhesion toughness of multilayer graphene films
title_full_unstemmed Adhesion toughness of multilayer graphene films
title_short Adhesion toughness of multilayer graphene films
title_sort adhesion toughness of multilayer graphene films
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5717257/
https://www.ncbi.nlm.nih.gov/pubmed/29208943
http://dx.doi.org/10.1038/s41467-017-02115-w
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