Controllable morphology genetic composites of porous SiC/Ti3SiC2 synthesized via template assembly strategy for tunable microwave absorption performance

Abstract

To achieve high-performance electromagnetic microwave absorption materials, the design of structures has proven to be a promising approach. In this study, we propose a novel method to enhance the absorption efficiency in SiC/Ti₃SiC₂ by modifying polarization properties and manipulating impedance matching within a controlled porous architecture created using the freeze-drying technique. The unidirectionally aligned porous structure of SiC/Ti₃SiC₂ enables the material to achieve a high absorption intensity with an ultralow RL_min of −61.9 dB at a thickness of 2.5 mm. This high absorption efficiency is attributed to the well-aligned lamellar walls perpendicular to the vertically incident electromagnetic waves, which induce substantial interface reflection and significant polarization effects. Moreover, the spherical porous structure, composed of interconnected SiC/Ti₃SiC₂ walls with non-directional spherical micropores, effectively resolves the impedance matching and energy loss conflict, resulting in an ultrawide EAB of 4.46 GHz at a thickness of 2.3 mm.