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<p>Electromagnetic interference (EMI) has become a critical issue in modern electronic devices, necessitating effective shielding materials for mitigating its adverse effects. This study investigates the electromagnetic shielding properties of CaCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub>(CCTO)/CoFe<sub>2</sub>O<sub>4</sub> (CFO)/Aluminium(Al)/silicone composites over a broad frequency range, focusing on the influence of a conducting filler (Al) on their performance. The composites are fabricated through compression moulding involving the dispersion of CCTO/CFO/Al nanoparticles within a silicone matrix, with varying concentrations of conducting filler. The composites are formulated with varying ratios of Al to silicone with CCTO and CFO kept fixed by weight, denoted as CCAS-1, CCAS-2, CCAS-3, and CCAS-4 composites. The electromagnetic shielding effectiveness (SE) of the composites is evaluated using a vector network analyzer over the frequency range of 8&#xa0;GHz to 22&#xa0;GHz. Notably, the CCAS-4 composite exhibited a total shielding effectiveness (SE<sub>T</sub>) of approximately 12 dB, corresponding to 94% microwave attenuation. This remarkable enhancement in shielding efficiency and SE is attributed to synergistic contributions of electrical conductivity, interfacial polarization, and magnetic property of the composite. These findings underscore the potential of CCAS composite can be an effective electromagnetic shielding material with promising applications in various technological domains.</p>

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Role of conducting filler on electromagnetic shielding performance of CaCu3Ti4O12/CoFe2O4/Al/silicone composites over wide frequency range

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月13日

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  • Neelam Kumari,
  • Amena Salim,
  • Rahul Singhal,
  • Vishant Gahlaut,
  • Jigar Limbachiya,
  • Bhuwaneshwar Semwal,
  • Ravi Hegde,
  • Pushpendra Kumar,
  • Umesh Kumar Dwivedi

摘要

Electromagnetic interference (EMI) has become a critical issue in modern electronic devices, necessitating effective shielding materials for mitigating its adverse effects. This study investigates the electromagnetic shielding properties of CaCu3Ti4O12(CCTO)/CoFe2O4 (CFO)/Aluminium(Al)/silicone composites over a broad frequency range, focusing on the influence of a conducting filler (Al) on their performance. The composites are fabricated through compression moulding involving the dispersion of CCTO/CFO/Al nanoparticles within a silicone matrix, with varying concentrations of conducting filler. The composites are formulated with varying ratios of Al to silicone with CCTO and CFO kept fixed by weight, denoted as CCAS-1, CCAS-2, CCAS-3, and CCAS-4 composites. The electromagnetic shielding effectiveness (SE) of the composites is evaluated using a vector network analyzer over the frequency range of 8 GHz to 22 GHz. Notably, the CCAS-4 composite exhibited a total shielding effectiveness (SET) of approximately 12 dB, corresponding to 94% microwave attenuation. This remarkable enhancement in shielding efficiency and SE is attributed to synergistic contributions of electrical conductivity, interfacial polarization, and magnetic property of the composite. These findings underscore the potential of CCAS composite can be an effective electromagnetic shielding material with promising applications in various technological domains.