Graphene flakes under controlled biaxial deformation

• DOI: 10.1038/srep18219
• Publication Date: 2015-12-15T09:55:12Z
• Authors: Charalampos Andro...; Emmanuel N. Koukaras; John Parthenios; George Kalosakas; Konstantinos Papa...; Costas Galiotis
• Keywords: Tension (geology); Strain (injury); Tandem

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 subject 2D materials controlled equibiaxial strain on supported beams can be flexed up or down the material either compression tension, respectively. Using gauges in tandem with Raman spectroscopy measurements, monitor G and phonon properties biaxial thus extract important information about uptake stress these conditions. The shift over for peaks were found range 62.3 \pm 5 cm^-1/%, 148.2 6 respectively, but also bilayer graphenes. corresponding Gruneisen parameters between 1.97 0.15 2.86 0.12, These values agree reasonable well those obtained from small-strain bubble-type experiments. results presented backed by classical ab initio molecular dynamics simulations excellent agreement \Gamma-E2g shifts strains parameter was observed.