Nanosized CoFe2O4-graphene nanoplatelets with massive dielectric enhancement for high frequency device application

A simple solvothermal method was used to fabricate CoFe2O4 -graphene nanoplatelets (CFO-GnPS). X-ray Powder Diffraction (XRD) pattern, RAMAN spectra and Fourier-transform infrared spectroscopy (FTIR) spectra confirmed the pure-phase of CFO-GnPS nanocomposite. FESEM and TEM micrographs revealed the graphene platelets had a flaky structure with adequate wrinkles, decorated with CFO nanoparticles with average size 34 nm. The dielectric constant for CFO nanoparticles was 8.3 E6 which when blended with GnPs increased massively to 2.3 E8 for frequency of 100 Hz to 1 MHz from 30 degrees C to 300 degrees C. Present work is focussed to reduce the eddy current loss in the material so as to exploit it in the field of high frequency based devices. Frequency dependence complex permittivit study indicates a significant improvement in the complex permittivity of CFO-GnPs nanocomposite leading to a reduction in Eddy loss which favours the material to be used in multi-functional camouflage coatings and high-frequency operations. Magnetization measurement divulges CFO-GnPs possess ferrimagnetism behaviour exhibiting a promising prospect in high frequency devices.