Self-orientation of graphite-nanoplates induces anisotropy of nanoplates-epoxy composites

Graphite nanoplates-epoxy composites with anisotropic dielectric properties were prepared via a solution route. The self-orientation of the graphite nanoplates in the epoxy matrix leads to the anisotropy of the composites. The dielectric permittivity in the direction parallel to the surfaces of the samples is about several times of that perpendicular to their surfaces. The out-of-plane dielectric permittivity of the 1.2 wt.% graphite nanoplates-epoxy composite is 8 at 1 MHz, while the in-plane dielectric permittivity is 39. The dielectric loss in both directions is below 0.05. High dielectric permittivity and low dielectric loss of the composites make them have potential applications in embedded capacitors.