▎ 摘　　要

Cobalt-cerium (Co-Ce) doped nickel ferrite (F) nanoparticles having formula Ni0.8Ce0.2Co0.5Fe1.5O4 were prepared by the sol-gel auto combustion method. Graphene coated Co-Ce doped Ni ferrite (F/G) and polymer (Lugalvan BNO12) coated F/G ternary nanocomposites (F/G/P) were prepared by the dispersion method. Different characterization techniques were used to investigate the different properties of these synthesized samples. TG-DTA showed the thermal degradation of all composites up to 900 C. The FTIR spectra revealed the presence of two absorption bands that confirmed the ferrite contents in all three composites. It also showed the aromatic contents in the F/G and F/G/P composites due to the presence of graphene and polymer. The XRD patterns revealed a single phase of Ni ferrite doped with Co-Ce without other intermediate phases. The crystallite size was found to be 32.41 nm maximum for the F/G/P composites. The SEM images showed that the surface of the F/G nanocomposite was uniformly coated by Lugalvan BNO12 polymer molecular chains. EDX confirmed the presence of the respective components in all prepared composites. VSM characterization was used to measure the hysteresis loops for the determination of the anisotropy constant, magnetic moments, initial permeability, squareness ratio, remanence and saturation magnetization. These parameters showed a decrease in values in the following order F/G/P > F/G > F. F/G/P revealed the highest coercivity (279.2 G). The fascinating magnetic activity of this nanocomposite makes it a potential candidate in the applications of energy storage, adsorbents for pollutants remediation technologies, electrochemical sensors, chemical process catalysts and electromagnetic wave absorbers.