Abstract
CoFe2O4-graphene nanocomposite with different graphene content (5, 10 and 15 wt%) were synthesized by the high energy planetary Ball mill method using zirconium coated steel balls with a speed of 300 rpm for 24 hours. The structural properties and molecular vibrations or rotations of the material were studied by the XRD and Raman spectroscopy respectively. The electrical impedance (Zˈ) characterization reveals the increase in ac conductivity (σac) with the increase in graphene percentage in the composite as compared to pure cobalt ferrite. The conducting nature of graphene is also being reflected by the Nyquist plot. It is very interesting to note that the combination of CoFe2O4 nanoparticles with graphene results in a dramatic conversion of the inactive CoFe2O4 into a highly conductive composite, which is suited as electrode material in energy storage devices (supercapacitors, batteries, fuel cells and solar cells). The significant enhancement in conductivity under the applied electric field of 2 V (peak to peak) and frequency range 1 Hz to 1 MHz has been observed at room temperature due to addition of graphene in the CoFe2O4.
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