ABSTRACT In recent years, materials capable of achieving efficient electromagnetic wave (EMW) absorption over a broad frequency range have attracted widespread attention. Such materials are not only significant in mitigating electromagnetic interference and pollution caused by the extensive use of electronic devices but also demonstrate outstanding application value in enhancing the stealth performance of various military equipment. This study successfully synthesized MWCNTs@TiO 2 /C composite absorbers through hydrothermal and thermochemical treatments. First, using Ti 4+ as the central atom and 2‐aminoterephthalic acid as the ligand, MIL‐125‐NH 2 (Ti) was grown in situ on multi‐walled carbon nanotubes (MWCNTs), yielding MWCNTs@MIL‐125‐NH 2 (Ti). This material was then carbonized at elevated temperatures to construct MWCNTs@TiO 2 /C composites featuring a three‐dimensional (3D) conductive network structure. Experimental results demonstrate that the MTC‐700 composite exhibits a minimum reflection loss (RL m ᵢ n ) of −57.85 dB at a thickness of only 1.7 mm, along with an effective absorption bandwidth (EAB) of 4.89 GHz. It exhibits excellent absorption performance across the 2–18 GHz frequency band. CST simulation results confirm that this composite material exhibits outstanding radar cross‐section attenuation performance, with a radar cross‐section (RCS) attenuation value of 32.9 dB m 2 . This approach offers a novel strategy for addressing EMW pollution by providing a nonmagnetic composite material that is simple to prepare, lightweight, and exhibits high absorptive properties across a broad frequency range.
Lu et al. (Fri,) studied this question.