Fabrication of multiple core-shell structures MnO@HsGDY@NC@HsGDY hybrid nanofibers for enhanced microwave absorption

Optimizing the structure and composition of emerging materials to produce efficient absorbers are one strategy for addressing electromagnetic pollution and radar stealth. For the first time, hydrogen-substituted graphdiyne (HsGDY) is used as a functional component for the preparation of microwave-absorbing materials in this paper. By using MnO₂ nanowires as template and sequentially coating HsGDY, polydopamine (PDA) and HsGDY shell layers, MnO₂@HsGDY@PDA@HsGDY nanowire precursors are obtained. The one-dimensional (1D) nanowires combine the advantages of multicomponent composite, multiple core-shell structures. After calcination, 1D microwave absorption absorber MnO@HsGDY@NC@HsGDY with multi-layer and core-shell structures is produced. The high conductivity of HsGDY enhances the material's dielectric loss, and the multiple heterogeneous interfaces in the material structure cause interface polarization, resulting in the excellent microwave absorption properties. MnO@HsGDY@NC@HsGDY exhibits the advantages of low filler content, thin matching thickness, strong microwave absorption capacity and wide effective absorption band (EAB). The minimum reflection loss (RL_min) can reach −68.57 dB@13.8 GHz@2.4 mm, and the EAB is 6.7 GHz as the filler content is 11 %. This work enriches the types of 1D materials and absorbers, expands the application fields of HsGDY, and provides a reference for the design and preparation of absorbers.