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<p>In this work, the influence of graphene nanoplatelets (GNPs) was investigated with respect the structural, optical, electrical, dielectric, and magnetic properties of Ni<sub>0.5</sub>Co<sub>0.5</sub>Se<sub>0.09</sub>Fe<sub>1.88</sub>O<sub>4</sub>/x-GNPs (NCSF/x-GNPs, 0–5 wt.% with a step size of 1.25) synthesized via the sol–gel auto-combustion route. X-ray diffraction (XRD) analysis confirmed the cubic spinel structure of all samples, with a minimum crystallite size of 18.16&#xa0;nm. Scanning electron microscopy (SEM) micrographs revealed that GNPs were uniformly coated with NCSF nanoparticles, exhibiting slight aggregation and clustering. UV–Vis data showed that the sample with 0 wt.% GNPs had the lowest optical bandgap of 2.09&#xa0;eV. Current–voltage (<i>I–V</i>) measurements verified the semiconducting behavior of the composites, with activation energies ranging from 0.16&#xa0;eV to 0.59&#xa0;eV. The minimum tangent loss, dielectric constant, and dielectric loss were recorded for the sample containing 3.75 wt.% GNPs, attributed to the conductive nature of GNPs and the hopping mechanism. Vibrating sample magnetometry (VSM) results indicated that saturation magnetization, remanence, and retentivity decreased up to 2.5 wt.% GNPs, then increased with further addition. The overall results suggest that NCSF/GNP composites possess promising potential for use as recoverable catalysts under visible light and in energy storage applications.</p> Graphical Abstract <p></p>

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Synergistic Effects of Se and Graphene Nanoplatelets on the Magneto-Dielectric Behavior of Ni-Co Ferrites

  • 期刊论文

  • 发表日期：

    2025年11月6日

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  • Mubashir Naveed,
  • Muhammad Ajaz-un-Nabi,
  • Muhammad Imran Arshad,
  • Nasir Amin

摘要

In this work, the influence of graphene nanoplatelets (GNPs) was investigated with respect the structural, optical, electrical, dielectric, and magnetic properties of Ni0.5Co0.5Se0.09Fe1.88O4/x-GNPs (NCSF/x-GNPs, 0–5 wt.% with a step size of 1.25) synthesized via the sol–gel auto-combustion route. X-ray diffraction (XRD) analysis confirmed the cubic spinel structure of all samples, with a minimum crystallite size of 18.16 nm. Scanning electron microscopy (SEM) micrographs revealed that GNPs were uniformly coated with NCSF nanoparticles, exhibiting slight aggregation and clustering. UV–Vis data showed that the sample with 0 wt.% GNPs had the lowest optical bandgap of 2.09 eV. Current–voltage (I–V) measurements verified the semiconducting behavior of the composites, with activation energies ranging from 0.16 eV to 0.59 eV. The minimum tangent loss, dielectric constant, and dielectric loss were recorded for the sample containing 3.75 wt.% GNPs, attributed to the conductive nature of GNPs and the hopping mechanism. Vibrating sample magnetometry (VSM) results indicated that saturation magnetization, remanence, and retentivity decreased up to 2.5 wt.% GNPs, then increased with further addition. The overall results suggest that NCSF/GNP composites possess promising potential for use as recoverable catalysts under visible light and in energy storage applications.

Graphical Abstract