Impedance and dielectric spectroscopy study of graphene-doped liquid crystal E7

Abstract

The change in electrical conductivity and dielectric response of liquid crystal (LC) E7 by doping with graphene nanoparticles was experimentally studied by complex electrical impedance and dielectric spectroscopy over the frequency range from 0.1 Hz to 1 MHz of the applied electric field. In the measured graphene/E7 nanocomposite films (7 μm-thick, with planar orientation), graphene nanoflakes were dispersed in the nematic E7 at the concentration of 10-3 wt.%. Graphene nanodopants lead to a change of both electrical transport and dielectric permittivity of the LC E7 which should render improved electro-optic response of the considered room-temperature nanocomposite nematic films.