機械的はく離法によるグラフェン引張試験片の作製および破壊じん性評価

抄録

We investigate the fracture behavior of single crystal graphene using in-situ tensile test. Pristine graphene, which is generally single crystal is obtained by mechanical peeling method. For fracture testing, we introduce pre-crack with a focused ion beam. Before tensile test, we identify the geometry and crystal structure of the specimen using a scanning electron microscope (SEM) and a transmission electron microscope, and confirm the layer number of the specimen with Raman spectroscopy. The bilayer graphene specimen with center crack fabricated by a focused ion beam, is tensioned using in-situ tensile testing system under scanning electron microscope. From in-situ tensile test, we obtain load-displacement curve and continuous SEM images. The test results explain that the graphene specimen shows an unstable and brittle fracture behavior and that cracks propagate from tips of pre-crack.