The construction of multifunctional aerogels with optimized stealth performance remains challenging due to unbalanced dielectric-magnetic properties and limited tunability of porous structures. Herein, we report polymer-based EVA-Fe 3 O 4 -GO (EFG) aerogels via a direct heated cross-linking process and pores modulation engineering. The obtained porous EFG hybrid aerogels construct discontinuous dielectric matrix and optimize dielectric-magnetic synergism, achieving efficient electromagnetic wave absorption. The pores modulation engineering enables precise control over porosity, where regulating NaCl template content modifies pore sizes and densities, forming a hierarchical porous architecture. EFG aerogels exhibit a minimum reflection loss (RL min ) of −34.3 dB at 2.0 mm and a broad effective absorption bandwidth (EAB) of 4.56 GHz in high-frequency bands. The synergistic combination of Fe 3 O 4 nanoparticles and GO sheets enhances magnetic-dielectric loss, while the porous structure promotes multiple microwave scattering. Additionally, the EFG aerogels demonstrate excellent infrared stealth and thermal insulation performance, maintaining surface temperatures below 40 °C under continuous heating. The EFG aerogels show promising potential for electromagnetic wave absorption and infrared stealth applications in aerospace and defense sectors, offering a facile strategy for high-performance multifunctional aerogel design.
Xu et al. (Mon,) studied this question.