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(a,b) SEM images of the impact fracture surface at 77 K of pure epoxy and graphene/epoxy composites containing 0.1 wt% graphene. Reused with permission from Ref. [40]. Copyright 2012 Elsevier. (c) Schematic of the fracture mechanism of graphene/epoxy composites. Reused with permission from Ref. [41]. Copyright 2017 Elsevier.
