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<p>Lightweight and ultrathin microwave absorbers demand a composition that simultaneously minimizes thickness, maximizes attenuation, and broadens bandwidth. Here we report a composite of reduced graphene oxide (rGO) and Ba<sub>0.7</sub>Sr<sub>0.3</sub>Fe<sub>12</sub>O<sub>19</sub> (BSF), which provides a tunable route to optimize absorber thickness, reflection loss, and shielding effectiveness. Pristine BSF shows weak absorption (<i>R</i><sub>L</sub> ≈ − 8&#xa0;dB @ &gt; 3&#xa0;mm), whereas rGO incorporation enhances dielectric loss and achieves strong impedance matching and progressive thinning: BSFRG2 (− 37.69&#xa0;dB @ 2.4&#xa0;mm), BSFRG4 (− 35.83&#xa0;dB @ 2.0&#xa0;mm, 2.86&#xa0;GHz bandwidth), BSFRG6 (− 26.18&#xa0;dB @ 1.5&#xa0;mm, Ku-band extension), and BSFRG8 (− 27.93&#xa0;dB @ 1.3&#xa0;mm, Ku-band extension). Attenuation analysis confirms absorption-dominated loss (&gt; 99% for all BSF-rGO composite samples), while shielding effectiveness exceeds 21&#xa0;dB for BSFRG6 and BSFRG8 samples, approaching commercial standards. The results establish rGO loading as a compositional knob to tune the trade-off between thickness, bandwidth, and shielding, providing a general design principle for next-generation ultrathin absorbers in EMI shielding and stealth technologies.</p> Graphical abstract <p>Conceptual schematic illustrating potential application domains of BSF-rGO-based ultrathin microwave absorbers for electromagnetic wave attenuation. The illustrated aerospace and marine platforms are shown solely as schematic representations to indicate prospective EMI shielding and stealth-relevant scenarios.</p>

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rGO-tailored Ba–Sr hexaferrite composites for high-performance X-band microwave absorption and EMI shielding

  • 期刊论文

  • 发表日期：

    2026年2月14日

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  • Shiffali Middha,
  • Indu Sharma,
  • Vishal Arora,
  • Satvir Singh,
  • Nitin Tandon,
  • Harmanjit Singh Dosanjh,
  • Sajan Masih,
  • Arshdeep Kaur,
  • Chirag Garg,
  • Shaminder Singh Sandhu,
  • Neeraj Bansal,
  • Jaspal Singh,
  • Pawandeep Kaur,
  • Aseem Vashisht,
  • Abul Kalam,
  • Anupinder Singh

摘要

Lightweight and ultrathin microwave absorbers demand a composition that simultaneously minimizes thickness, maximizes attenuation, and broadens bandwidth. Here we report a composite of reduced graphene oxide (rGO) and Ba0.7Sr0.3Fe12O19 (BSF), which provides a tunable route to optimize absorber thickness, reflection loss, and shielding effectiveness. Pristine BSF shows weak absorption (RL ≈ − 8 dB @ > 3 mm), whereas rGO incorporation enhances dielectric loss and achieves strong impedance matching and progressive thinning: BSFRG2 (− 37.69 dB @ 2.4 mm), BSFRG4 (− 35.83 dB @ 2.0 mm, 2.86 GHz bandwidth), BSFRG6 (− 26.18 dB @ 1.5 mm, Ku-band extension), and BSFRG8 (− 27.93 dB @ 1.3 mm, Ku-band extension). Attenuation analysis confirms absorption-dominated loss (> 99% for all BSF-rGO composite samples), while shielding effectiveness exceeds 21 dB for BSFRG6 and BSFRG8 samples, approaching commercial standards. The results establish rGO loading as a compositional knob to tune the trade-off between thickness, bandwidth, and shielding, providing a general design principle for next-generation ultrathin absorbers in EMI shielding and stealth technologies.

Graphical abstract

Conceptual schematic illustrating potential application domains of BSF-rGO-based ultrathin microwave absorbers for electromagnetic wave attenuation. The illustrated aerospace and marine platforms are shown solely as schematic representations to indicate prospective EMI shielding and stealth-relevant scenarios.