MOF-derived CoNi@C integrated into carbon nanotubes/aramid nanofiber hybrid aerogels for efficient and tunable electromagnetic wave absorption

The development of high-performance electromagnetic wave (EMW) absorption materials that are effective in harsh environments remains a significant challenge. Herein, a lightweight, flexible, and robust three-dimensional hybrid aerogel is fabricated for efficient broadband EMW absorption. The aerogel is constructed by integrating metal-organic framework (MOF)-derived magnetic CoNi@C nanoparticles and carboxylated multi-walled carbon nanotubes (c-MWCNTs) into an aramid nanofiber (ANF) framework. The synergistic effect between the components endows the composite with remarkable attenuation capability via conductive loss, dielectric loss, magnetic loss, and interfacial polarization. The optimized aerogel exhibits exceptional EMW absorption performance, achieving a minimum reflection loss (RL min ) of −59.66 dB at a thickness of 2.68 mm and a broad effective absorption bandwidth (EAB) of 7.96 GHz at a thickness of 2.94 mm. This work provides a promising strategy for designing advanced EMW absorption materials with integrated properties of strong absorption, wide bandwidth, and environmental resistance for use in aerospace, military, and electronic protection fields.