The Preparation Of Metal Oxide/Graphene Nanocomposites And Study On Its Performance

Graphene with the carbon atoms arranged in a two-dimensional(2D)honeycomb lattice,has been deemed as one of the most popular materials due to its excellent thermal stability,high young's modulus and huge theoretically specific surface area.In nearly a decade,many work has been reported on graphene,graphene can not only separate as excellent thermally conductive material,and its huge specific surface area can make it as a good carrier material,so it could be combined with other materials to reinforced composite materials.Among them,the metal nanometer materials,due to the mature preparation methods,could be connected with graphene and prepared composite with magnetism,light heat absorption,heat resistance,thermal light sensors,chemical or biological activity performance.Unfortunately,the poor inter-sheet connections between isolated graphene nanosheets as building blocks break the continuous pathway for electron transport and severely suppress the intrinsically high conductivity and mechanical strength of individual graphene nanosheets.In addition,the unavoidable restacking and agglomeration owing to the strong ?-? stacking and van der Waals force-induced adhesion between the neighboring nanosheets in standard graphene products reduce the accessible specific surface area.Therefore,how to prepare graphene with larger specific surface area has become a focus in this article.Based on the above analysis,this article studies mainly focus on preparing graphene with different morphologies by changing the experiment condition.Finally,according to the properties of composite material itself to the corresponding performance tests,the main research work is as follows:(1)The graphene with different morphologies was prepared by selecting different raw materials and experimental methods.The results showed that the quality of the graphene products was different.The graphene obtained by the commonly used graphite powder,flake graphite and expanded graphite as the raw material is much smaller than the size of the graphene obtained by the ultrasonic wave treated expanded graphite prepared by the same redox method.This is due to the high temperature destruct the dense structure between graphite layers,the ultrasonic treatment process broke graphite sheets and stripped.The subsequent oxidationreaction makes it easier to insert oxygen-containing groups between the graphite sheets.The graphene size produced by this method is greater than 100 microns and the number of layers is less than 3.In addition,after obtaining the graphene oxide,the graphene with three-dimensional network structure was obtained by hydrothermal reduction,and the composite surface was prepared by complexing with metal nanoparticles.In the subsequent experiments,the specific surface area of the graphene was further increased by the further oxidation of the three-dimensional reticulated graphene to obtain graphene graphene with dense blooming.The graphene is also viscous and can also be used as a coating material.(2)A simple one pot hydrothermal method was used to obtain a series of metal nano-oxide and graphene composite materials.In the course of the experiment,the excellent properties of the metal oxide itself are combined with the graphene to obtain co-enhancement.The results show that the new form of cobalt oxide is produced by the reduction of graphene and cobalt trioxide by hydrothermal reduction,and the composite material has high catalytic efficiency and electron mobility in the oxygen evolution reaction.At the same time,we also used the magnetic iron oxide to prepare a magnetic anti-oxidation varnish.Experiments show that the addition of graphene significantly improved the dispersion of iron oxide in varnish.The resulting product can be uniformly dispersed in the varnish and has excellent oxidation resistance in water and seawater.