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<p>Researchers have been working for a decade to develop fiber surface with special functionalities through coating techniques. However, developing function-specific natural fibers (NFs) materials remains a challenging task because NFs are non-conductive substrates. Also, researchers identified that, materials with strong dielectric characteristics are favored for EMI shielding applications. The present work made an attempt to develop and characterize the novel hybrid fiber mat (HFM) comprising ramie and pineapple fibers arranged in alternatively plain weave pattern. The HFM is pre-treated in NaOH solution to improve surface reactivity and subsequently coated with nickel–phosphorus (Ni–P)/graphene (Gr) to enhance its electrical conductivity, dielectric properties and EMI shielding capabilities. Experimental results revealed that the treated and coated HFM (THFM) exhibited significantly improved electrical conductivity (16.15 S/cm), which is 50% higher than untreated and coated. The highest dielectric constant recorded was 72.93 at 35&#xa0;°C and 50&#xa0;Hz which decreased with increasing temperature. The maximum impedance (Z<sub>max</sub>) was recorded as 2.491 × 10<sup>6</sup>&#xa0;Ω at 60&#xa0;°C and 50 Hz. Further, the TCHFM showed an average EMI shielding effectiveness (EMI SE) of 51 dB at X-band frequency. The obtained EMI SE values exceed the standard requirement of 20 dB, indicating strong blockage of electromagnetic waves. Beyond enhanced conductivity, the Ni–P/Gr coating provides excellent structural conformability over the complex woven NFs and shifts the shielding mechanism to be absorption dominant, which is vital for preventing secondary electromagnetic pollution. The obtained results indicated that coated NFs have promising potential to adopt as EMI shielding material due to their eco-friendliness, lightweight nature, and cost effectiveness.</p>

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Synergistic Dielectric and EMI Shielding Performance Enhancement in Alternatively Woven Ramie/Pineapple Fiber Composite via Chemical Treatment and Coating

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Goudilyan Mylsamy,
  • Prabu Krishnasamy,
  • U. Shyamala Devi,
  • Ramesh Natesan

摘要

Researchers have been working for a decade to develop fiber surface with special functionalities through coating techniques. However, developing function-specific natural fibers (NFs) materials remains a challenging task because NFs are non-conductive substrates. Also, researchers identified that, materials with strong dielectric characteristics are favored for EMI shielding applications. The present work made an attempt to develop and characterize the novel hybrid fiber mat (HFM) comprising ramie and pineapple fibers arranged in alternatively plain weave pattern. The HFM is pre-treated in NaOH solution to improve surface reactivity and subsequently coated with nickel–phosphorus (Ni–P)/graphene (Gr) to enhance its electrical conductivity, dielectric properties and EMI shielding capabilities. Experimental results revealed that the treated and coated HFM (THFM) exhibited significantly improved electrical conductivity (16.15 S/cm), which is 50% higher than untreated and coated. The highest dielectric constant recorded was 72.93 at 35 °C and 50 Hz which decreased with increasing temperature. The maximum impedance (Zmax) was recorded as 2.491 × 106 Ω at 60 °C and 50 Hz. Further, the TCHFM showed an average EMI shielding effectiveness (EMI SE) of 51 dB at X-band frequency. The obtained EMI SE values exceed the standard requirement of 20 dB, indicating strong blockage of electromagnetic waves. Beyond enhanced conductivity, the Ni–P/Gr coating provides excellent structural conformability over the complex woven NFs and shifts the shielding mechanism to be absorption dominant, which is vital for preventing secondary electromagnetic pollution. The obtained results indicated that coated NFs have promising potential to adopt as EMI shielding material due to their eco-friendliness, lightweight nature, and cost effectiveness.