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Experimental Study On Load Transfer And Adhesion Properties Of Graphene/PET Interface

Posted on:2019-12-05Degree:MasterType:Thesis
Country:ChinaCandidate:X T YuFull Text:PDF
GTID:2381330596466701Subject:Solid mechanics
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Graphene,an ideal two-dimensional atomic crystal,has the lowest resistance rate and highest strength and heat conduction ever reported.Thus,graphene has application prospects in many fields and has aroused common concern.Because graphene has only atomic thickness,in general,it must be attached to a substrate to realize its function.In all the graphene-based microstructures,interfacial interactions occur between all the materials.Therefore,research on the interfacial mechanical behavior of graphene is urgently needed to provide guidance for its applications.In this paper,we focused on a large-sized monolayer of graphene produced by chemical vapor deposition method,which was attached to a plastic substrate(Polyethylene terephthalate,PET),and investigated the mechanical properties of the interface between the large-sized graphene and the PET substrate.The research included the mechanical behavior of the interface in tangential direction and the adhesion properties of the interface in the normal direction.The mechanical properties of the interface between the large-sized graphene and the PET substrate in the tangential direction were studied by the Raman spectroscopy.The process of interfacial stress/strain transfer from the PET surface to the graphene was analyzed and the evolution of the bonding state,indicating initial,adhesion,slide,and debond of the graphene-substrate interface during loading was discussed.Then,the adhesion energy of the shear interface was calculated by a integration of the interfacial shear stress.The influence of the graphene length(50?m,140?m,270?m and 600?m)on the adhesion energy was discussed showing that the interfacial mechanical parameters such as the interfacial shear stress and adhesion energy of the shear interface were size-dependent.Micro-sized graphene has a stronger interface and vice versa.The adhesion properties of the interface in the normal direction were mainly studied by the double cantilever beam(DCB)experiment,which contained two parts,including the selection of the adhesive and the measurement of the adhesion energy of graphene/PET interface.Firstly,a series of experiments were performed to choose a stronger adhesive to be used in the subsequent experiments.Then,the adhesion energy of graphene/PET interface was measured by the double cantilever beam fracture testing.Large-area monolayer graphene attached on PET was peeled off the substrate,and the adhesion energy of graphene and PET was determined from the force–displacement curve generated from the peeling process.The peeling results were determined by the Avometer to check whether the graphene was peeled off the PET substrate.By peeling the graphene with different peeling rate,the adhesion energy was found to be ratedependent.
Keywords/Search Tags:Graphene, Raman spectroscopy, Interfacial mechanic property, Double cantilever beam experiment, Adhesion energy
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