Research on the dielectric constant of graphene solution at the microwave frequency of 9.212GHz

Abstract

In order to measure the graphene’s dielectric constant, the microwave cavity perturbation method was employed. At the frequency of 9.212 GHz, graphene with three concentrations of 5 g ml ^−1 , 2.5 g ml ^−1 and 1.25 g ml ^−1 was studied respectively. For these three solutions, as inserted depth in the microwave resonator, concentration and capillary’s diameter changed, the dielectric constant’s real part and imaginary part were all measured, calculated and discussed. The results showed that the real part of the graphene’s dielectric constant increased with the increase of the depth of the capillary into the resonator, decreased with the increase of the capillary diameter. The conductivity of graphene solution was measured which decreased with the increase of liquid concentration.

Keywords

• graphene
• dielectric constant
• microwave cavity perturbation method