▎ 摘　　要

Films and dispersions of reduced graphene oxide (rGO) composites with Fe2O3 nanostructures have been synthesized by liquid/liquid interface and co-precipitation methods, respectively. Gamma phase, Fe2O3 nanoparticles with rGO are obtained as aqueous dispersions by co-precipitation method while Fe2O3 nanostructures consisting of a mixture of alpha and gamma phases are obtained in the form of freestanding thin films at the liquid/liquid interface. Different morphologies of Fe2O3 such as nano particles and nanorods are obtained by employing a modified or bare liquid/liquid interface. The nucleation and growth in this case is controlled by the density of oxygen functional groups on rGO. A comparison of the magnetic properties of dispersion and films of nanocomposites and their constituents are presented. rGO-gamma Fe2O3 dispersions show superparamagnetic nature while films exhibit extremely low magnetic moments confirming the presence of mixed phases of Fe2O3. Electrochemical capacitance studies of nanocomposite films reveal contributions due to electrical double layer capacitance of rGO and pseudocapacitance of Fe2O3 nanostructures and a specific capacitance 64.5 Fig at 2 mV/s is estimated. These films in microgram quantities without the aid of any binders exhibit good adhesion on carbon electrodes with excellent recyclability and less internal resistance and are promising for applications as supercapacitors. (C) 2018 Elsevier B.V. All rights reserved.