Nitrogen-doped core-shell Fe/Fe3C@C nanocomposites for electromagnetic wave absorption

Magnetic-activated carbon-based nanocomposites with core-shell structure have attracted wide attention in electromagnetic wave absorption (EMA) field. In this work, Fe/Fe3C@C nanocomposites with a core-shell structure were prepared by solvothermal synthesis and high-temperature carbonization process. The formed heterogeneous structure of Fe/Fe3C@C nanocomposite is conducive to improving its polarization loss capability. The Fe/Fe3C@C nanocomposites exhibit efficient EMA performance, the minimum reflection loss (RL) is - 22.08 dB at 13.85 GHz, and the effective absorption bandwidth (RL = - 10 dB) reaches 5.50 GHz (11.75-17.25 GHz) with a thickness of 2.3 mm. The high-efficiency EMA performance is attributed to the synergistic effects of well-matched impedance characteristics and heterogeneous structure. This work may provide a kind of novel insights into the preparation of broadband EMA materials by optimization of structure and composition.