Preparation And Properties Of Graphene/Copper Composites Based On Btex Carbon Source

Graphene has become a perfect reinforcement for copper-based composites due to its excellent mechanical and electrical properties.However,graphene is easy to agglomerate due to its large specific surface area,which not only weakens its own properties,but also reduces the strength of the composites.Therefore,overcoming the agglomeration problem of graphene and exerting its advantages is an urgent problem to be solved in the preparation of high-performance composite materials.In this paper,graphene was directly grown on the surface of copper powder by in-situ growth method.BTEX with similar structure to graphene were used as carbon source to prepare graphene by thermal driven molecular dehydrogenation polymerization.The effects of the type and content of BTEX and heat treatment conditions on the quality and morphology of graphene were studied,and the microstructure and properties of the composites were tested and characterized.The results are as follows:In order to explore whether BTEX represented by mesitylene,anthracene,pyrene,perylene and coronene can be converted into graphene under the catalysis of high temperature copper,this article heats the composite powder at 700?for 1 min.The characteristic peaks D and G of graphene are obviously observed.After processing the graphene Raman spectrum,it is found that as the molecular mass of the carbon source and the number of acenes increase,the main defects in graphene are converted from 3-5member heterocyclic defects to graphene layer carbon atoms in immediate vicinity of a lattice disturbance like the edge of a graphene layer or a heteroatom in case of doted graphite,and there are fewer defects caused by the sp~3 cross-linked structure.In order to further prepare high-quality graphene composite powder,this paper explores the temperature and time during the heat treatment of the composite powder,and finds that as the heat treatment time increases,the quality of graphene prepared from anthracene and perylene has been obviously reduced,the quality of graphene prepared from coronene is significantly improved,and the quality of graphene prepared with mesitylene and pyrene as carbon sources is constantly in a state of oscillation.The reaction temperature of each benzene molecule is different.At the beginning of the carbonization reaction,the graphene prepared by anthracene,pyrene and perylene is mainly based on the edge defects of graphene,and as the temperature increases,it gradually changes to 3-5-membered ring heterocycle defect.After the composite material is corroded,the corroded carbon presents an obvious porous flake structure,its morphology is similar to the three-dimensional network graphene structure,and the pore size is equivalent to the copper powder particle size,indicating that the carbonization process mainly occurs on the surface of the copper powder.By optimizing the preparation process of BTEX,a graphene/copper composite material with excellent comprehensive performance was obtained.The tensile and compressive strengths of the composite materials prepared with mesitylene as the carbon source were increased by 121%and 329%,respectively,and the electrical conductivity reached 90.5%IACS.The comprehensive performance of the composite materials has been significantly improved.