Structure Design And Conductivity Regulation Of Graphene Composites

As a new two-dimensional carbon material with high conductivity,graphene has a promising development in many fields.In this thesis,the composite slurry with different graphene concentration and polymer type was prepared by using environmental protection water-based solvent as dispersion system,and then the transparent antistatic film,conductive film and printing circuit products were prepared by rod coating,casting and screen printing,respectively.The macroscopic properties and potential application value were discussed.The thesis mainly includes the following contents:(1)Using water and ethanol as solvents,a series of waterborne dispersions of graphene with different concentrations were successfully prepared and combined with waterborne polyurethane(WPU).The transparent antistatic film based on flexible substrate was prepared by rod coating.When the surface resistance was reduced to 109 Ω,the transmittance reached 70%.The aqueous dispersion of graphene was further modified with polyvinylpyrrolidone(PVP)to increase the concentration of graphene in aqueous solvent to 1.78 mg/ml,and the surface resistance of the film was as low as 105 Ω by regulating the coating method.(2)Using graphene as conductive filler and WPU as adhesive,graphene-based waterborne conductive ink was prepared by using imidazole ionic liquid modified graphene dispersion.Conductive ink was printed on different substrates by screen printing.After further post-treatment,the paper-based printing pattern surface resistance was reduced to 24 Ω/□.The conductive ink was used as the working electrode and successfully applied to friction nanogenerator.(3)Using bovine serum albumin(BSA)as dispersing agent,the BSA-based graphene conductive ink was prepared.By adjusting the processing time,ink can be screen printing,but also can be written directly to obtain conductive patterns.Based on the conductive ink,the tensile strain sensor is prepared,and the performance of the sensor and its application value in monitoring human joint activity are further discussed.