About: Failure Processes in Embedded Monolayer Graphene under Axial Compression

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Description	Exfoliated monolayer graphene flakes were embedded in a polymer matrix and loaded under axial compression. By monitoring the shifts of the 2D Raman phonons of rectangular flakes of various sizes under load, the critical strain to failure was determined. Prior to loading care was taken for the examined area of the flake to be free of residual stresses. The critical strain values for first failure were found to be independent of flake size at a mean value of –0.60% corresponding to a yield stress up to -6 GPa. By combining Euler mechanics with a Winkler approach, we show that unlike buckling in air, the presence of the polymer constraint results in graphene buckling at a fixed value of strain with an estimated wrinkle wavelength of the order of 1–2 nm. These results were compared with DFT computations performed on analogue coronene/ PMMA oligomers and a reasonable agreement was obtained. Exfoliated monolayer graphene flakes were embedded in a polymer matrix and loaded under axial compression. By monitoring the shifts of the 2D Raman phonons of rectangular flakes of various sizes under load, the critical strain to failure was determined. Prior to loading care was taken for the examined area of the flake to be free of residual stresses. The critical strain values for first failure were found to be independent of flake size at a mean value of –0.60% corresponding to a yield stress up to -6 GPa. By combining Euler mechanics with a Winkler approach, we show that unlike buckling in air, the presence of the polymer constraint results in graphene buckling at a fixed value of strain with an estimated wrinkle wavelength of the order of 1–2 nm. These results were compared with DFT computations performed on analogue coronene/ PMMA oligomers and a reasonable agreement was obtained. (en)
Title	Failure Processes in Embedded Monolayer Graphene under Axial Compression Failure Processes in Embedded Monolayer Graphene under Axial Compression (en)
skos:prefLabel	Failure Processes in Embedded Monolayer Graphene under Axial Compression Failure Processes in Embedded Monolayer Graphene under Axial Compression (en)
skos:notation	RIV/61388955:_____/14:00428888!RIV15-GA0-61388955
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GA14-15357S)
http://linked.open...iv/cisloPeriodika	JUN 2014
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Frank, Otakar
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav fyzikální chemie J. Heyrovského AV ČR, v.v.i.
http://linked.open...dnocenehoVysledku	16397
http://linked.open...ai/riv/idVysledku	RIV/61388955:_____/14:00428888
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	monoleyer graphene; phonons; physical chemistry (en)
http://linked.open.../riv/klicoveSlovo	phonons physical chemistry monoleyer graphene
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[249AE894148E]
http://linked.open...i/riv/nazevZdroje	Scientific Reports
http://linked.open...in/vavai/riv/obor	CF
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	10 (xsd:int)
http://linked.open...vavai/riv/projekt	Strain engineering of electronic structure in graphene
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	4
http://linked.open...iv/tvurceVysledku	Frank, Otakar Galiotis, C. Novoselov, K. S. Papagelis, K. Parthenios, J. Tsoukleri, G. Androulidakis, Ch. Koukaras, E. N. Pugno, N. Sfyris, D.
http://linked.open...ain/vavai/riv/wos	000337226100009
issn	2045-2322
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1038/srep05271

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