The structural, dielectric and impedance spectroscopic properties of NiMnCeFe2O4/MWCNTs nanocomposites for energy storage applications

This research study employed the sol–gel auto-combustion technique for the fabrication of NiMnCeFe₂O₄ nanoparticles. Their nanocomposites with MWCNTs (multi-walled carbon nanotubes) (NiMnCeFe₂O₄)_1−x/(MWCNTs)_x; x = 0–20 wt% have been prepared via ultra-sonication route. For the purpose of functionalization of the both, toluene served as the dispersive medium. X-ray diffraction (XRD) techniques were employed to investigate the crystalline structure and phase constituents of prepared nanocomposites. From the XRD results, the average crystallize size was calculated and found in the range of 8.20 nm. Transmission electron microscopy (TEM) imaging allowed a detailed examination of the microstructure and morphology of the nanocomposites. The atomic vibrations and chemical composition of the nanocomposite were studied using Fourier Transform Infrared Spectroscopy (FTIR). The dielectric properties of the nanocomposite have been examined across a frequency range of 25 Hz to 1 MHz. These properties were notably altered with the incorporation of MWCNTs. The dielectric constant and loss have increased at lower of frequency for the samples of the nanocomposites. This value of the high dielectric constant and loss observed can be explained by Maxwell–Wagner type space charge polarization. The impedance of the prepared nanocomposites has decreased massively with the addition of the MWCNTs as compare to the pristine nanoparticles. The magnetic of the characteristics synthesized nanocomposites were also examined under the influence of an applied magnetic field ranging from − 20 to 20 kOe. The integration of MWCNTs resulted in remarkable changes in the magnetic and dielectric properties of the pure nanoparticles. This demonstrates the potential of MWCNTs to improve the performance of nanocomposite for use in electric and magnetic storage applications.