Preparation And Research Of Graphene Microtubes And Hollow Structure Graphene Films

Because of its various excellent properties,graphene has caused a research boom in the scientific research community,and graphene-based macro materials have great application prospects in the fields of energy storage,sensing,and catalysis.Currently,graphene oxide sheets are commonly used as the basic material for assembling graphene macro materials.The graphene oxide sheets are first assembled and then reduced.This thesis uses graphene oxide N-N dimethylformamide dispersion to prepare graphene microtubes and hollow graphene films based on electrostatic spray technology.1.Graphene microtubes(?-GTs)with good tubular structure were successfully prepared by using commercial graphene oxide(GO)through electrostatic spray technology(ESD)and thermal reduction technology Subsequently,the increase in annealing temperature was studied The change of its structure and electrical conductivity explores its conduction mechanism.As the annealing temperature increases,the conductivity of ?-GTs increases significantly.?-GTs with lower annealing temperature have unique semiconductor characteristics and their conduction mechanism can be explained by a two-dimensional Variable Range Hopping model.Once the annealing temperature exceeds 900 oC,a semiconductor to semimetal transition will occur,and in this case,the conduction mechanism follows the exponential law of temperature.2.Using electrostatic spinning and the combination of electrostatic spray method by changing the graphene oxide and nylon fiber mixing herself,preparation for a series of different proportions of hollow graphene films,first of all,for the preparation of the hollow graphene films conducted a series of characterization,to its morphology,internal structure and performance characterization of the different proportions of hollow the influence of specific surface area of graphene films,second,to the preparation of hollow graphene films assembled into lithium ion battery,and lithium ion battery of the assembly test,study of graphene oxide and nylon fiber mixing effect on the performance of the battery than quantity.It was found that when the ratio of go to nylon was 1:1,the specific surface area of the hollow graphene film reached the maximum and the electric capacity of the battery assembled by the hollow graphene film reached the maximum.