Antimony‐Hybridization Engineering in p‐n Heterojunctions for Optimized Electromagnetic Wave Absorption

Abstract The Sb‐hybridization strategy enables the precise construction of p‐n heterojunctions, which significantly enhances the electromagnetic wave (EMW) absorption performance by optimizing the interface polarization. In this study, an innovative in situ ion‐exchange method is developed to implement Sb hybridization, establishing built‐in electric fields within CoS 2 /Sb 2 S 3 @CNFs that amplify the polarization relaxation loss. This structural design synergistically combines a carbon‐skeleton‐induced conductive network with the magnetic loss mechanisms of CoS 2 , ultimately yielding an exceptional EMW absorber. The optimized composite demonstrates remarkable EMW attenuation capabilities, achieving a minimum reflection loss (RL min ) of −57.53 dB at 2 mm and an effective absorption bandwidth (EAB max ) of 7.28 GHz (covering the X‐band (8–12 GHz) and Ku‐band (12–18 GHz)). This study not only provides a novel strategy for designing advanced EMW absorbers but also highlights the significance of p‐n heterojunction engineering for EMW absorption in functional composites.