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/Fe3C embedded in two-dimensional carbon nanosheets network (FeSiCr/Fe3C@C/C) nanocomposites fabricated by plasma arc-discharging method. FeSiCr/Fe3C@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.

中文翻译：

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碳包覆核壳 FeSiCr/Fe3C 嵌入碳纳米片网络纳米复合材料以提高微波吸收性能

开发具有可调厚度和带宽的微波吸收材料对于实际应用尤为重要，但其实现仍然是一个巨大的挑战。在这里，我们报告了碳包覆的核壳 FeSiCr/Fe3C嵌入二维碳纳米片网络（FeSiCr/Fe3C@C/C) 等离子弧放电法制备的纳米复合材料。FeSiCr/Fe3C@C/C具有最佳的微波吸收性能，其中最小计算反射损耗（RL）可以达到[公式：见正文][公式：见正文]dB at 11.5[公式：见正文]GHz，涂层厚度为2.4[公式：见文]mm和有效吸收带宽（RL[公式：见文][公式：见文]dB）几乎覆盖4.5-18[公式：见文]GHz范围通过调整涂层厚度从1.3到5.0【公式：见正文】mm。改进的微波吸收特性可归因于优化的阻抗匹配和增强的传播微波的极化损耗、传导损耗和内反射。