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<p>The rapid progress of flexible electronics has generated a requirement for lightweight materials that block high-frequency electromagnetic interference (EMI). However, finding a material that stabilizes physical flexibility with strong microwave absorption continue to be a substantial challenge in modern research. This research fills this gap by developing a flexible film made of lead hexaferrite (LHF) nanoparticles anchored onto reduced graphene oxide (rGO) sheets within a PVA-PEG polymer matrix. Scanning Electron Microscope and Transmission Electron Microscope analysis confirms that this design avoids particle clustering and creates a powerful conductive network. In the Ku-band (12–18&#xa0;GHz), the 40wt% loaded film attained a shielding effectiveness of over 25dB. The material works primarily through an absorption dominant mechanism, where incident waves are competently converted into thermal energy rather than reflected. Beyond shielding, the composite offers high tensile strength (2.04&#xa0;MPa), enhanced thermal stability and improved water resistance. Remarkably, the film preserves its shielding efficiency even after 200 mechanical folding cycles and extreme temperature shifts. These free standing films are appropriate for broadband EMI protection in wearable technology, flexible gadgets and high-frequency communication systems.</p>

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Absorption-Dominant Ku-Band Shielding via Flexible PVA-PEG/Lead Hexaferrite-Reduced Graphene Oxide Nanocomposites Films

  • 期刊论文

  • 发表日期：

    2026年5月6日

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  • Noble George,
  • Shivani Pandya,
  • Manuel George

摘要

The rapid progress of flexible electronics has generated a requirement for lightweight materials that block high-frequency electromagnetic interference (EMI). However, finding a material that stabilizes physical flexibility with strong microwave absorption continue to be a substantial challenge in modern research. This research fills this gap by developing a flexible film made of lead hexaferrite (LHF) nanoparticles anchored onto reduced graphene oxide (rGO) sheets within a PVA-PEG polymer matrix. Scanning Electron Microscope and Transmission Electron Microscope analysis confirms that this design avoids particle clustering and creates a powerful conductive network. In the Ku-band (12–18 GHz), the 40wt% loaded film attained a shielding effectiveness of over 25dB. The material works primarily through an absorption dominant mechanism, where incident waves are competently converted into thermal energy rather than reflected. Beyond shielding, the composite offers high tensile strength (2.04 MPa), enhanced thermal stability and improved water resistance. Remarkably, the film preserves its shielding efficiency even after 200 mechanical folding cycles and extreme temperature shifts. These free standing films are appropriate for broadband EMI protection in wearable technology, flexible gadgets and high-frequency communication systems.