Graphene nanoplatelets anchored into Ag doped spinel CoFe2O4 nanohybrid: Synthesis, structural, electrical, superior dielectric and room temperature induced ferromagnetism performance for high frequency device application

Abstract

Graphene (GnPs) incorporated Ag-CoFe2O4 nanocomposite was synthesized using a simple solvothermal method using green synthesis method by okra plant extract. The prepared materials were micro-analyzed by X-ray diffraction (XRD) measurements, Fourier transform-infrared (FT-IR) spectra, Field emission scanning electron microscope (FESEM) and transmission electron microscopy (TEM) microanalysis. The average particle size obtained from XRD data was calculated to be 32.6 nm for Ag- CFO nanoparticles and 24 nm for GnPs doped Ag- CFO nanocomposite which was in good agreement with the particle size (in nm) estimated from the FESEM and TEM micrographs. The effective charge carriers transfer from the from Ag- CFO nanoferrites to graphene pallets and in case of GnPs incorporated Ag- CFO nanocomposite and the long-drawn-out recombination of electron–hole pairs were evidently shown by means of room temperature PL measurements. The photocurrent values well support the PL measurements signifying transfer of the electron-hole pairs. Light dependent Electrochemical Impedance Spectroscopy indicates the incidence of a light dependent dielectric relaxation phenomenon. Massive dielectric values with low loss suggest the GnPs doped nanohybrid to be well suited for high frequency device application. Interestingly, incorporation of GnPs alters the electronic configuration of the nanocomposites inducing ferromagnetic interaction.