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Fracture of polycrystalline graphene membranes by in situ nanoindentation in a scanning electron microscope

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Title: Fracture of polycrystalline graphene membranes by in situ nanoindentation in a scanning electron microscope

Subject: Chemical vapor deposition, ; Failure, ; Grain boundaries, ; Graphene, ; Nanoindentation

Journal: PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS, v.9, no.10, pp.564 - 569

Abstract: Failure of polycrystalline graphene grown by chemical vapor deposition was investigated by nanoindentation in a scanning electron microscope. Circular graphene membranes were subject to central point loads using a nanomanipulator combined with an atomic force microscope cantilever as a force sensor. The grain boundaries of the polycrystalline graphene were visualized by Raman spectroscopy coupled with a carbon isotope labeling technique. Graphene membranes without any grain boundary had a failure strength of 45.4 ± 10.4 GPa, compared to 16.4 ± 5.1 GPa for those with grain boundaries when a Young's modulus was assumed to be 1 TPa. © 2015 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim