Carbon Coated Core-Shell FeSiCr/Fe₃C Embedded in Carbon Nanosheets Network Nanocomposites for Improving Microwave Absorption Performance

Abstract

Development of microwave absorbing materials with tunable thickness and bandwidth is particularly important for practical applications, but its realization remains a great challenge. Here, we report carbon coated core-shell FeSiCr/Fe 3 C embedded in two-dimensional carbon nanosheets network (FeSiCr/Fe 3 C@C/C) nanocomposites fabricated by plasma arc-discharging method. FeSiCr/Fe 3 C@C/C has the best microwave absorption properties in which the minimum calculated reflection loss (RL) can reach [Formula: see text][Formula: see text]dB at 11.5[Formula: see text]GHz with a coating thickness of 2.4[Formula: see text]mm and the efficient absorption bandwidth (RL[Formula: see text][Formula: see text]dB) almost covers 4.5–18[Formula: see text]GHz range by adjusting the coating thicknesses from 1.3 to 5.0[Formula: see text]mm. The improved microwave absorption properties could be ascribed to the optimized impedance matching and enhanced polarization loss, conduction loss and internal reflections of the propagated microwave.