Fabry-Pérot-Like Cavity in Fiber Composites for Enhanced Dual-Spectra Compatible Defense Performance

Abstract

Dual-spectra defense is of great significance in the field of defense security. However, due to the inherent lightness and flexibility of these materials, achieving high-performance dual-spectra compatibility remains challenging. In this work, we fabricated a novel fiber composite material featuring a Fabry-Pérot-like cavity structure, produced through electrospinning combined with in situ growth on microhilled cellulose paper. The resulting fiber composite exhibited remarkable electromagnetic shielding effectiveness (SE, 64.6 dB) and absolute shielding effectiveness (SSE/t, 5471.5 dB cm² g⁻¹). Stacking two sheets of the fiber composite achieved an outstanding shielding performance of 92.0 dB, mainly due to wave cancellation and reflection effects inside the Fabry-Pérot-like cavity structure. Furthermore, the low infrared emissivity and thermal conductivity of the fiber composite endowed it with excellent infrared stealth performance, significantly reducing the radiation temperature of the hot object surface. The radiation temperature of the fiber composite showed negligible changes over 60 min when placed on a hot object (90 °C). Meanwhile, the resulting fiber composite was capable of actively releasing infrared information via Joule heating to decoy adversarial trackers. This work provides a scalable electrospinning route toward dual-spectra stealth films and warrants scale-up engineering for realistic deployment.

Graphical Abstract

Keywords

Lignin / Fiber composite / Fabry-Pérot-like cavity / Spectra defense

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Funding

National Natural Science Foundation of China(22178208)

RIGHTS & PERMISSIONS

Donghua University, Shanghai, China