Reduced graphene oxide/MXene based semi-open cellular structure magnetic composite foam for microwave absorption and sound absorption

The development of multifunctional electromagnetic wave absorbing (EWA) materials is essential for mitigating electromagnetic interference and noise pollution in communication base stations and electronic devices. Herein, a semi-open honeycomb-structured Ni flower/reduced graphene oxide (RGO)/Ti 3 C 2 T x MXene-melamine foam (MF) composite was successfully fabricated via electrostatic self-assembly followed by hydrazine vapor reduction, exhibiting efficient microwave absorption and multifunctional integration. Interestingly, the Ni flower/RGO/MXene-MF demonstrates exceptional microwave absorption properties, achieving a remarkable minimum reflection loss of −63.6 dB and an effective absorption bandwidth (EAB) of 7.04 GHz. The outstanding performance is attributed to enhanced impedance matching, synergistic dielectric and magnetic losses, dipole and interfacial polarization effects, and the unique semi-open honeycomb-like 3D dielectric/magnetic network. In addition, Ni flower/RGO/MXene-MF integrates microwave absorption, sound absorption, flame retardancy, and hydrophobicity, providing valuable insights for the design of next-generation multifunctional EWA materials.