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Graphene flakes under controlled biaxial deformation

Thin membranes, such as monolayer graphene of monoatomic thickness, are bound to exhibit lateral buckling under uniaxial tensile loading that impairs its mechanical behaviour. In this work, we have developed an experimental device to subject 2D materials to controlled equibiaxial strain on supported...

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Autores principales: Androulidakis, Charalampos, Koukaras, Emmanuel N., Parthenios, John, Kalosakas, George, Papagelis, Konstantinos, Galiotis, Costas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4678326/
https://www.ncbi.nlm.nih.gov/pubmed/26666692
http://dx.doi.org/10.1038/srep18219
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author Androulidakis, Charalampos
Koukaras, Emmanuel N.
Parthenios, John
Kalosakas, George
Papagelis, Konstantinos
Galiotis, Costas
author_facet Androulidakis, Charalampos
Koukaras, Emmanuel N.
Parthenios, John
Kalosakas, George
Papagelis, Konstantinos
Galiotis, Costas
author_sort Androulidakis, Charalampos
collection PubMed
description Thin membranes, such as monolayer graphene of monoatomic thickness, are bound to exhibit lateral buckling under uniaxial tensile loading that impairs its mechanical behaviour. In this work, we have developed an experimental device to subject 2D materials to controlled equibiaxial strain on supported beams that can be flexed up or down to subject the material to either compression or tension, respectively. Using strain gauges in tandem with Raman spectroscopy measurements, we monitor the G and 2D phonon properties of graphene under biaxial strain and thus extract important information about the uptake of stress under these conditions. The experimental shift over strain for the G and 2D Raman peaks were found to be in the range of 62.3 ± 5 cm(–1)/%, and 148.2 ± 6 cm(–1)/%, respectively, for monolayer but also bilayer graphenes. The corresponding Grüneisen parameters for the G and 2D peaks were found to be between 1.97 ± 0.15 and 2.86 ± 0.12, respectively. These values agree reasonably well with those obtained from small-strain bubble-type experiments. The results presented are also backed up by classical and ab initio molecular dynamics simulations and excellent agreement of Γ-E(2g) shifts with strains and the Grüneisen parameter was observed.
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spelling pubmed-46783262015-12-17 Graphene flakes under controlled biaxial deformation Androulidakis, Charalampos Koukaras, Emmanuel N. Parthenios, John Kalosakas, George Papagelis, Konstantinos Galiotis, Costas Sci Rep Article Thin membranes, such as monolayer graphene of monoatomic thickness, are bound to exhibit lateral buckling under uniaxial tensile loading that impairs its mechanical behaviour. In this work, we have developed an experimental device to subject 2D materials to controlled equibiaxial strain on supported beams that can be flexed up or down to subject the material to either compression or tension, respectively. Using strain gauges in tandem with Raman spectroscopy measurements, we monitor the G and 2D phonon properties of graphene under biaxial strain and thus extract important information about the uptake of stress under these conditions. The experimental shift over strain for the G and 2D Raman peaks were found to be in the range of 62.3 ± 5 cm(–1)/%, and 148.2 ± 6 cm(–1)/%, respectively, for monolayer but also bilayer graphenes. The corresponding Grüneisen parameters for the G and 2D peaks were found to be between 1.97 ± 0.15 and 2.86 ± 0.12, respectively. These values agree reasonably well with those obtained from small-strain bubble-type experiments. The results presented are also backed up by classical and ab initio molecular dynamics simulations and excellent agreement of Γ-E(2g) shifts with strains and the Grüneisen parameter was observed. Nature Publishing Group 2015-12-15 /pmc/articles/PMC4678326/ /pubmed/26666692 http://dx.doi.org/10.1038/srep18219 Text en Copyright © 2015, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Androulidakis, Charalampos
Koukaras, Emmanuel N.
Parthenios, John
Kalosakas, George
Papagelis, Konstantinos
Galiotis, Costas
Graphene flakes under controlled biaxial deformation
title Graphene flakes under controlled biaxial deformation
title_full Graphene flakes under controlled biaxial deformation
title_fullStr Graphene flakes under controlled biaxial deformation
title_full_unstemmed Graphene flakes under controlled biaxial deformation
title_short Graphene flakes under controlled biaxial deformation
title_sort graphene flakes under controlled biaxial deformation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4678326/
https://www.ncbi.nlm.nih.gov/pubmed/26666692
http://dx.doi.org/10.1038/srep18219
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