Dipole‐Plasmon Synergistic Ordered Triatomic‐Terminated MXene With Multi‐Spectrum Selectivity for Integrated Radar‐Infrared Stealth

Achieving radar‐infrared stealth compatibility and integrating dual stealth functionalities into a single material represents a long‐sought goal for advanced stealth systems. Herein, we synthesized ordered OBO triatomic‐terminated MXene via a flux‐assisted eutectic molten‐etching strategy and achieved multispectral electromagnetic response from microwave to infrared waves through ordered OBO surface terminations. In the microwave band, abundant polarization sites introduced by ordered OBO surface terminations induce excellent dielectric responses, thereby endowing the material with superior microwave attenuation properties—featuring an ultra‐broad effective absorption bandwidth (EAB) of 4.32 GHz and a minimized matching thickness of 1.55 mm. In the infrared band, OBO surface terminations form p‐π conjugation, enhancing electronic delocalization and suppressing electron scattering, thereby enabling incident infrared light to excite plasmon reflection. This further induces an excellent metallic‐like electrical response and yields an average emissivity as low as 0.4 across the 3–5 and 8–14 µm mid‐to‐far infrared atmospheric windows. Notably, a single material innovatively achieves radar‐infrared stealth compatibility through multispectral selectivity. This work pioneers the use of ordered polyatomic terminations to engineer spectrally selective electromagnetic responses in 2D materials, offering a novel single‐material solution for advanced multiband stealth technologies.