Investigation of Electromagnetic Properties of Epoxy-Graphene Nanocomposites

In this research, electromagnetic properties of graphene-epoxy nanocomposite up to wt% graphene, were investigated in X band. Results showed that these nanocomposites do not have significant permeability so that it can be considered equal to 1. However they exhibit high permittivity such that real part of permittivity of 3wt% graphene sample is 8.4 in GHz and 6.8 in 12GHz frequencies, which are respectively 2.9 and 2.3 times that of pure epoxy at the same frequencies. Also imaginary part of permittivity was obtained 5.8 in 8GHz and 4.4 in 12GHz that is respectively 144 and 68 times that of pure epoxy at the same frequency. Also, the average value of loss factor was measured 0.5 and 0.8 for 2 and 3wt% graphene sample respectively. An average effective electrical conductivity of 3S/m for 3wt% graphene sample was attained. Results showed that the epoxy-graphene nanocomposites are very convenient materials for electromagnetic absorption applications.