Reversible loss of Bernal stacking during the deformation of few-layer graphene in nanocomposites.

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 sha

SUBMITTER: Gong L 

PROVIDER: S-EPMC3789269 | biostudies-literature | 2013 Aug

REPOSITORIES: biostudies-literature