Structural, Dielectric, and Impedance Properties of MgFe2O4 Nanoparticles and Multi-walled Carbon Nanotubes Nanocomposites

Different concentrations of multi-walled carbon nanotubes (MWCNTs) were added in magnesium ferrite (MgFe2O4) nanoparticles prepared by co-precipitation method to obtain (MWCNTs)(x)/MgFe2O4; x = 0, 5, 10, 15, and 20 wt% nanocomposites. These nanocomposites were synthesized by ultra-sonication-assisted method along with toluene as a dispersive medium. These nanocomposites were characterized for their structural, compositional, and dielectric properties. The phase purity, average crystallite size, and crystal structure of these nanocomposites were characterized by X-ray diffraction. The X-rays density, measured density, porosity, and specific surface area were calculated by using standard relations. Fourier transform infrared spectroscopy was used to study different vibrational modes, and shape was visualized by scanning electron microscopy in these nanocomposites. The dielectric and impedance measurements of (MWCNTs)(x)/MgFe2O4 nanocomposites were carried out at room temperature by using LCR meter. The experimental results revealed improvement in the dielectric properties with the increased concentrations of MWCNTs. The decreasing trend in impedance parameters was observed with increased loadings of MWCNTs in these nanocomposites. The effects of grains and grain boundaries were determined from Cole-Cole plots between real and imaginary parts of impedance. Moreover, the improvement in dielectric properties gave us a clue that these prepared nanocomposites could be good for high-frequency devices and sensing applications.