Core‐Shell PBA@C@ITO Nanocubes With Low Infrared Emissivity and Efficient Microwave Absorption for Multifunctional Stealth Applications

Abstract Stealth materials with single composition are facing challenges to meet the urgent demands in advanced anti‐detection technologies. How to combine the ability of high microwave absorption (MA) with low infrared (IR) emissivity performance in one material is the key point. Herein, the core‐shell PBA@C@ITO nanocubes are innovatively prepared by polycondensation and co‐precipitation. These nanocubes are characterized with enhanced multifunctional properties showing a minimum reflection loss (RL _min ) at −45.96 dB, an effective absorption bandwidth (EAB) of 6 GHz. More remarkably, the average IR emissivity of PBA@C@ITO‐40 wt%/PEI film in 3–5 µm and 8–14 µm is as low as of 0.195 and 0.286, respectively. Thanks to the introduction of indium tin oxide (ITO), which enables to achieve impedance matching and enhances multiple loss modes while significantly reducing IR emissivity. Thus, this promising work provides a solid foundation for the research of advanced multifunctional stealth materials. Furthermore, this work emphasizes the necessity of decoupled testing under realistic multi‐field conditions to accurately validate the intrinsic compatibility of MA and IR stealth performance, pointing toward future experimental platforms for synchronized evaluation.