Tunable 1T-Phase MoS2/CNT reinforced carbon foams for enhanced low-frequency electromagnetic wave absorption

With the rapid advancement of communication technology, electromagnetic pollution has become a critical issue, driving the demand for lightweight, broadband, and efficient electromagnetic wave (EMW) absorption materials. However, achieving effective low-frequency EMW absorption remains challenging due to the trade-off between attenuation capability and impedance matching. Here, we report a novel MoS 2 /CNT carbon foam (MC@CF) derived from pyrolyzed polyimide composite foam integrated with hydrothermally synthesized MoS 2 /CNT. By precisely controlling the 1T-phase content and leveraging the 3D interconnected porous architecture and heterogeneous interfaces, improved impedance matching and enhanced EMW dissipation are achieved. The MC@CF demonstrates exceptional low-frequency absorption, with a minimum reflection loss (RL min ) of −65.6 dB in the C band and −49.4 dB at 2.25 GHz in the S band. Additionally, the foam exhibits a remarkable radar cross-section (RCS) reduction of 26.1 dB·m 2 , high compressive strength (1.45 MPa), and superior thermal insulation, making it promising for extreme environment applications.