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Reversible Loss of Bernal Stacking during the Deformation of Few-Layer Graphene in Nanocompo sites

Author(s)
Gong, LeiYoung, Robert J.Kinloch, Ian A.Haigh, Sarah J.Warner, Jamie H.Hinks, Jonathan A.Xu, ZiweiLi, LiDing, FengRiaz, IbtsamJalil, RashidNovoselov, Kostya S.
Issued Date
2013-08
DOI
10.1021/nn402830f
URI
https://scholarworks.unist.ac.kr/handle/201301/31350
Fulltext
https://pubs.acs.org/doi/10.1021/nn402830f
Citation
ACS NANO, v.7, no.8, pp.7287 - 7294
Abstract
The deformation of nanocomposites containing graphene flakes with different numbers of layers has been investigated with the use of Raman spectroscopy. It has been found that there is a shift of the 2D band to lower wavenumber and that the rate of band shift per unit strain tends to decrease as the number of graphene layers increases. It has been demonstrated that band broadening takes place during tensile deformation for mono- and bilayer graphene but that band narrowing occurs when the number of graphene layers is more than two. It is also found that the characteristic asymmetric shape of the 2D Raman band for the graphene with three or more layers changes to a symmetrical shape above about 0.4% strain and that it reverts to an asymmetric shape on unloading. This change in Raman band shape and width has been interpreted as being due to a reversible loss of Bernal stacking in the few-layer graphene during deformation. It has been shown that the elastic strain energy released from the unloading of the inner graphene layers in the few-layer material (similar to 0.2 meV/atom) is similar to the accepted value of the stacking fault energies of graphite and few layer graphene. It is further shown that this loss of Bernal stacking can be accommodated by the formation of arrays of partial dislocations and stacking faults on the basal plane. The effect of the reversible loss of Bernal stacking upon the electronic structure of few-layer graphene and the possibility of using it to modify the electronic structure of few-layer graphene are discussed.
Publisher
AMER CHEMICAL SOC
ISSN
1936-0851
Keyword (Author)
grapheneBernal stackingnanocompositesRaman spectroscopydeformation
Keyword
RAMAN-SPECTROSCOPYMONOLAYER NANOCOMPOSITEMECHANICAL-PROPERTIESTRILAYER GRAPHENEBILAYER GRAPHENEGRAPHITESTRAINCRYSTALSPHONONSHEAR

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