Ti(3)C(2)T (x) /MoS(2) Self‐Rolling Rod‐Based Foam Boosts Interfacial Polarization for Electromagnetic Wave Absorption

Heterogeneous interface design to boost interfacial polarization has become a feasible way to realize high electromagnetic wave absorbing (EMA) performance of dielectric materials. However, interfacial polarization in simple structures such as particles, rods, and flakes is weak and usually plays a secondary role. In order to enhance the interfacial polarization and simultaneously reduce the electronic conductivity to avoid reflection of electromagnetic wave, a more rational geometric structure for dielectric materials is desired. Herein, a Ti(3)C(2)T (x) /MoS(2) self‐rolling rod‐based foam is proposed to realize excellent interfacial polarization and achieve high EMA performance at ultralow density. Different surface tensions of Ti(3)C(2)T (x) and ammonium tetrathiomolybdate are utilized to induce the self‐rolling of Ti(3)C(2)T (x) sheets. The rods with a high aspect ratio not only remarkably improve the polarization loss but also are beneficial to the construction of Ti(3)C(2)T (x) /MoS(2) foam, leading to enhanced EMA capability. As a result, the effective absorption bandwidth of Ti(3)C(2)T (x) /MoS(2) foam covers the whole X band (8.2–12.4 GHz) with a density of only 0.009 g cm(−3), at a thickness of 3.3 mm. The advantages of rod structures are verified through simulations in the CST microwave studio. This work inspires the rational geometric design of micro/nanostructures for new‐generation EMA materials.