One-dimensional Ag@NC-Co@NC composites with multiphase core-shell hetero-interfaces for boosting microwave absorption

Core-shell structural absorbers have attracted arousing attention in boosting microwave absorption in theory, however, it still remains great challenges to construct multiphase core-shell hetero-interfaces to manipulate interfacial polarization and final absorption performance. Herein, we propose a competition optimization strategy to fabricate one-dimensional (1D) Ag@NC-Co@NC composites, in which fractured Ag particles are encapsulated into 1D N-doped carbon networks and magnetic Co nanoparticles are wrapped by N-doped carbon shells, yielding to multiphase core-shell hetero-interfaces. Benefiting from conductive 1D carbon networks, dielectric-magnetic synergistic effect and abundant multiphase hetero-interfaces, the obtained composites exhibit promoted impedance characteristics and overwhelming microwave absorption. The minimum reflection loss achieves as high as −57.6 dB and the effective absorption bandwidth is 5.8 GHz at 3.2 mm with 40 wt% filler loading. This concept provides us an inspiring strategy to design and fabrication of high-performance absorbers by constructing multiphase core-shell hetero-interfaces.