Preparation Of Graphene Copper Composite By Chemical Vapor Depositon

Due to its special two-dimensional structure, excellent mechanical properties and thermal conductivity properties, graphene has become a hot topic in the field of materials. Graphene can be added to the metal substrate to prepare graphene reinforced metal matrix composites, which is an important direction about graphene’s application. Currently, related research on graphene reinforced copper matrix composites mainly prepared by mechanical stripping method and the reduction method of graphene oxide, this paper try to use chemical vapor deposition(CVD) method in order to prepare graphene and copper composite powder material according to S.Ruoff’s work in 2009.In this paper, SEM and RAMAN was used to analysis phase composition and microstructure of the products obtained by the copper foil; On the other hand, morphologies, phase composition and crystal structure of composites etched by nitric acid are also analyzed by Raman, SEM, and TEM.Using methane as the carbon source gas at a temperature of 1000 ℃, we obtain high quality, surface integrity, fewer defects graphene film under protective transfer method by PMMA. When using acetylene gas as carbon source, the minimum pyrolysis temperature is 650 ℃, at which temperature a very small amount of carbon nanotubes can be obtained on the copper foil. The ideal temperature of carbon nanotubes deposited on the copper foil is about 700 ℃. When the temperature reaches 750 ℃, some amorphous carbon particles will deposit on the copper foil. With the increase of the flow rate of acetylene, the ability to grow carbon nanotubes on the copper foil will continue to increase, the carbon nanotubes can be obtained covering the entire surface of the copper foil in 30 min when acetylene flow rate is 20 sccm.We obtained graphene copper composite powder material by chemical vapor deposition method when controlling the reaction temperature between 650 ℃-700 ℃ on 10 microns spherical copper powders. The results show that, graphene’s quality was getting better and better with the increase of the acetylene flow, but also had an increase in thickness. When the reaction temperature was 700 ℃, graphene copper composite powder material, whose graphene layers is about 5-10 can be obtained when acetylene gas flow is 10sccm-20 sccm.