Abstract
The present research investigated the effect of reduced graphene oxide (rGO) integration with as-synthesized Er2O3/ZnO nanocomposites on dielectric properties. The samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS), and energy dispersive spectroscopy (EDS). Complex impedance spectroscopy was utilized to characterize dielectric relaxation phenomena in Er2O3/ZnO and Er2O3/ZnO/rGO nanocomposites. All the samples exhibit single relaxation phenomena which are ascribed to grain boundaries. The addition of rGO to Er2O3/ZnO nanocomposite results in the enhancement of dielectric response due to increased local field intensity caused by the formation of conducting-insulating interfaces. Furthermore, the AC conductivity of the Er2O3/ZnO/rGO is increased at higher frequencies due to the presence of free charge carriers in rGO. At higher frequencies, Er2O3/ZnO/rGO nanocomposite with increased concentration of ZnO exhibits a more stable dielectric constant with extremely low dielectric loss. Hence, the inclusion of rGO in Er2O3/ZnO nanocomposites makes it a novel prospective candidate in the field of energy storage devices.
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