An experimental investigation on interfacial properties of graphene: Size effect

Abstract eng:
The size-dependent mechanical properties and the edge effect of the tangential interface between graphene and a polyethylene terephthalate substrate (PET) are investigated. The interfacial mechanical parameters of graphene with seven different lengths (50ȝm-1cm) are measured by in-situ Raman spectroscopy experiments. The three bonding status (adhesion, slide and debond) of the interface between the graphene and the substrate results are identified. New phenomena are observed in the interfacial stress/strain transfer process, such as the existence of the edge effect and the length of the edge of the interface can be affected by the size of graphene. Additionally, the interfacial shear stress exhibits a size effect, with its value significantly decreasing with an increase of the length of graphene, hence the interface between largesized graphene and PET is relatively weak. However, the ultimate stiffness and failure strength of the interface are size-independent as they are constant regardless of the length of graphene.

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