Room temperature AC properties and impedance analysis of Mg ferrite/polypyrrole (PPy) and Mg ferrite/reduced graphene oxide (rGO) composites

Author:

Ibrahim BilalORCID,Saafan Samia A.,Shater R. E. El,Omar Maha K.

Abstract

AbstractThe auto-combustion sol–gel method has been used to synthesize a powder sample of MgFe2O4 nanoparticles. Nanocomposites of Mg-ferrite/PPy and Mg-ferrite/rGO have been prepared by thorough physical mixing, with weight ratios of 20% PPy and 20% rGO, respectively. To have a full insight into the materials, their structural properties have been investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and Fourier transform infrared spectroscopy (FT-IR). DC conductivity has been investigated too, and by comparing the results, it has been observed a significant increase in the DC conductivity of the Mg-ferrite/PPy composite sample compared to the corresponding Mg-ferrite/rGO sample, a finding that would potentially impact the composite’s applications. The discussion of the frequency dependence of ε′, σac, and tan(δ) in these composite samples revolves around the concept of Maxwell–Wagner interfacial polarization. The sample Cole–Cole plots show distinct areas where incomplete semicircles overlap, each representing a different conduction process. These semicircles correspond to two equivalent circuits of parallel resistor–capacitor (R–C) combinations connected in series. Finally, it could be concluded that the new nanocomposite samples of MgFe2O4/20% rGO and MgFe2O4/20% PPy show dielectric properties that may be a stimulus for more studies in future work, where they are expected to be promising candidates for supercapacitor applications.

Funder

Tanta University

Publisher

Springer Science and Business Media LLC

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