摘要
Anisotropic TOCNF/rGO/BaFe 12 O 19 aerogels were fabricated via a simple FESTA strategy. • The anisotropic porous architecture promotes multiple reflection and scattering of EMWs. • BaFe 12 O 19 introduction enables synergistic dielectric-magnetic loss mechanisms. • A minimum reflection loss of −62.19 dB and a bandwidth of 8.91 GHz were achieved. • CST simulations confirm the excellent EMW attenuation capability. Leveraging its ultralight weight and well-developed porous structure, three-dimensional graphene aerogel demonstrates exceptional application value in electromagnetic wave absorption. Nevertheless, achieving synergistically enhanced absorption performance through simultaneous structural engineering and multi-loss mechanism integration remains a formidable challenge for lightweight graphene-based aerogels. In this work, anisotropic TOCNF/rGO/BaFe 12 O 19 aerogels were fabricated via a freezing-ethanol solvent exchange thawing and ambient drying (FESTA) strategy. By incorporating BaFe 12 O 19 , the cooperative enhancement of dielectric and magnetic losses was achieved, while the unique porous architecture promoted successive reflections and scattering of incident electromagnetic waves (EMWs) within the aerogel, thereby facilitating electromagnetic energy dissipation. With the rGO/BaFe 12 O 19 mass ratio adjusted to 1:1, the resulting aerogel achieved an RL min of −62.19 dB and an EAB of 8.91 GHz. The superior EMW absorption performance stems from the enhanced polarization and magnetic losses. Radar cross-section (RCS) analyses moreover reveal that the aerogel possesses favorable electromagnetic wave scattering suppression performance under realistic conditions. Therefore, this study offers a viable approach for realizing electromagnetic absorbing materials integrating light weight, broad bandwidth, and excellent performance. Download: Download high-res image (354KB) Download: Download full-size image
危险品化学品经营许可证（带存储）