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Polypyrrole-modified sandwich-structured textile with FSS for high-efficiency electromagnetic absorption and infrared stealth
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DOI：10.1016/j.surfin.2026.110323.png)
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Abstract
En 中文
Flexible wearable electromagnetic protective materials with multispectral camouflage are highly demanded in modern defense and wearable electronics, yet the poor flexibility, thick thickness, single loss mechanism and limited multifunctionality of conventional absorbing materials severely restrict their practical applications. Herein, a flexible sandwich-structured composite textile was fabricated via polypyrrole (PPy) surface modification and frequency-selective surface (FSS) structural design. The three-layer system consists of a top patterned conductive textile, a middle PPy-coated dielectric layer, and a bottom conductive metal fabric. The optimized composite achieves a minimum reflection loss of -26.64 dB at 13.3 GHz with an ultrathin thickness of only 1.15 mm, corresponding to an absorption efficiency of 99.78%. Polyester and PPy form stable heterogeneous interfaces, inducing abundant dielectric loss via interfacial polarization and dipole polarization; the FSS resonant structure provides intense ohmic loss via electromagnetic resonance. The synergistic multiple loss mechanisms ensure excellent microwave absorption. Furthermore, the composite exhibits outstanding UV shielding, thermal insulation, Joule heating, and infrared stealth performance. This work provides a feasible strategy for multifunctional flexible textile composites, showing promising prospects in wearable electromagnetic protection and multispectral stealth applications.
Keywords:
Polypyrrole
Sandwich structure
Frequency selective surface
Composite fabric
Electromagnetic absorption
Infrared stealth
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