Interfacial Sliding and Buckling of Monolayer Graphene on a Stretchable Substrate

摘要: The nonlinear mechanical response of monolayer graphene on polyethylene terephthalate (PET) is characterised using in-situ Raman spectroscopy and atomic force microscopy. While interfacial stress transfer leads to tension in as the PET substrate stretched, retraction during unloading imposes compression graphene. Two failure mechanisms, shear sliding under buckling compression, are identified. Using a shear-lag model, strength found range between 0.46 0.69 MPa. critical strain for onset ∼0.3%, while maximum that can be transferred ranges from 1.2% 1.6% depending size. Beyond compressive around −0.7%, ridges observed after unloading. results this work provide valuable insight design guidelines broad spectrum applications other 2D nanomaterials, such flexible stretchable electronics, sensing, nanocomposites.