Abstract：
: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.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Androulidakis C,Koukaras EN,Frank O,Tsoukleri G,Sfyris D,Parthenios J,Pugno N,Papagelis K,Novoselov KS,Galiotis Cdoi
10.1038/srep05271subject
Has Abstractpub_date
2014-06-12 00:00:00pages
5271issn
2045-2322pii
srep05271journal_volume
4pub_type
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