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<p>This study investigates the structural, electrical, magnetic, and dielectric properties of Cu<sub>0.4</sub>Ni<sub>0.3</sub>Mg<sub>0.3</sub>Fe<sub>2</sub>O<sub>4</sub> (<b>CNMF</b>) composites incorporated with varying graphene nanoplatelets (GNPs) weight concentrations (0%, 1.23%, 2.44%, 3.61%, 4.76% by weight) for potential high-frequency and electromagnetic interference (EMI) shielding applications. The composites were successfully synthesized using the sol–gel auto-combustion (SGAC) method. Structural analysis via X-ray diffraction (XRD) confirmed the formation of a single-phase spinel structure with crystallite sizes ranging from 30.97&#xa0;nm to 61.87&#xa0;nm and lattice constants between 8.3618&#xa0;Å and 8.3911&#xa0;Å. The crystallite size decreased, while the lattice constant increased with GNP loading, indicating enhanced structural distortion. UV–visible spectroscopy revealed that the optical band gap initially decreased (1.23% to 2.44% GNPs) and then increased (3.61% to 4.76% GNPs), suggesting band structure modifications due to GNP incorporation. Electrical analysis via current–voltage (IV) measurements showed a significant increase in DC resistivity from 6.59 × 10<sup>7</sup> Ω m (1.23% GNPs) to 1.60 × 10<sup>9</sup> Ω m (4.76% GNPs), enhancing the material's insulation properties. LCR measurements indicated a decreasing dielectric constant and loss tangent with increasing frequency, while the AC conductivity (2.09 × 10<sup>–5</sup> S-m<sup>−1</sup> with 4.76-wt% GNPs at 8&#xa0;MHz) and quality factor (478.31 with 4.76-wt% GNPs at 8&#xa0;MHz) improved, highlighting their suitability for high-frequency applications. Magnetic measurements using vibrating sample magnetometry (VSM) demonstrated enhanced magnetic saturation (52.57&#xa0;emu/g to 58.49&#xa0;emu/g) and coercivity (48.40 Oe to 235.1 Oe) with GNP addition, indicating improved magnetic response. The shielding effectiveness (SE) of the composites, measured over a frequency range of 1.6&#xa0;kHz to 8&#xa0;MHz, reached a maximum of 28.29&#xa0;dB for the 4.76% GNP composite, making these materials promising candidates for EMI shielding and high-frequency electronics.</p>

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Enhanced magneto-dielectric and electromagnetic interference shielding properties of Cu0.4Ni0.3Mg0.3Fe2O4/GNPs composites for medium-frequency applications

  • 期刊论文

  • 发表日期：

    2025年10月21日

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  • Moazzam Hussain,
  • Zeshan Munir,
  • Sharah A. Aldulmani,
  • Maria Akhtar,
  • M. Ajaz un Nabi,
  • Salah Knani,
  • Hareem Mufti,
  • Nasir Amin,
  • Kiran Mehmood,
  • M. S. Al-Buriahi,
  • Syed Zafar Ilyas,
  • Mongi Amami,
  • Muhammad Imran Arshad

摘要

This study investigates the structural, electrical, magnetic, and dielectric properties of Cu0.4Ni0.3Mg0.3Fe2O4 (CNMF) composites incorporated with varying graphene nanoplatelets (GNPs) weight concentrations (0%, 1.23%, 2.44%, 3.61%, 4.76% by weight) for potential high-frequency and electromagnetic interference (EMI) shielding applications. The composites were successfully synthesized using the sol–gel auto-combustion (SGAC) method. Structural analysis via X-ray diffraction (XRD) confirmed the formation of a single-phase spinel structure with crystallite sizes ranging from 30.97 nm to 61.87 nm and lattice constants between 8.3618 Å and 8.3911 Å. The crystallite size decreased, while the lattice constant increased with GNP loading, indicating enhanced structural distortion. UV–visible spectroscopy revealed that the optical band gap initially decreased (1.23% to 2.44% GNPs) and then increased (3.61% to 4.76% GNPs), suggesting band structure modifications due to GNP incorporation. Electrical analysis via current–voltage (IV) measurements showed a significant increase in DC resistivity from 6.59 × 107 Ω m (1.23% GNPs) to 1.60 × 109 Ω m (4.76% GNPs), enhancing the material's insulation properties. LCR measurements indicated a decreasing dielectric constant and loss tangent with increasing frequency, while the AC conductivity (2.09 × 10–5 S-m−1 with 4.76-wt% GNPs at 8 MHz) and quality factor (478.31 with 4.76-wt% GNPs at 8 MHz) improved, highlighting their suitability for high-frequency applications. Magnetic measurements using vibrating sample magnetometry (VSM) demonstrated enhanced magnetic saturation (52.57 emu/g to 58.49 emu/g) and coercivity (48.40 Oe to 235.1 Oe) with GNP addition, indicating improved magnetic response. The shielding effectiveness (SE) of the composites, measured over a frequency range of 1.6 kHz to 8 MHz, reached a maximum of 28.29 dB for the 4.76% GNP composite, making these materials promising candidates for EMI shielding and high-frequency electronics.