ABSTRACT To enhance the electromagnetic stealth functionality of carbon fiber (CF)‐based thermoplastic composites, surface modification serves as a commonly employed approach. However, maintaining the structural integrity of modified layers under harsh processing conditions remains challenging, often compromising the functional reliability of the final composites. This work presents a heterogeneous architecture in which NiCo alloy nanoparticles are encapsulated within aramid nanofilm (ANF) and firmly attached to the CF surface. This configuration improves the interfacial adhesion between CF and polyamide 6 (PA6), while also counteracting the mechanical weakening caused by fiber damage during high‐temperature reduction. Furthermore, this architecture enhances the composite's impedance matching and electromagnetic wave attenuation capacity. The resultant ANF@NiCo‐CF/PA6 material demonstrated outstanding microwave absorption characteristics, attaining a minimum reflection loss of −60.73 dB and an effective absorption bandwidth of 4.9 GHz at only 1.5 mm in thickness. This modification strategy demonstrates excellent structural stability under composite processing conditions, offering a novel pathway for developing CF‐reinforced thermoplastic stealth composites with superior interfacial and functional properties.
Chen et al. (Tue,) studied this question.