Electrical conductivity and interfacial polarization are two crucial factors to design high-performance electromagnetic absorption (EMA) materials, but how to synergistically balance these factors still remains to be difficult. In this work, we report the synthesis of Cu/C nanocomposites via the controlled pyrolysis of a MOF-guest complex. The prepared Cu/C nanocomposites are made up of cross-linked carbon network and various irregular particles. The carbon network provides appropriate electrical conductivity to contribute to the conductance loss. Multiple heterogeneous interfaces, such as Mo₂C/C, Mo₂C/CuO, CuO/C, Mo₂C/Cu, and Cu/C interfaces, have been determined in these Cu/C nanocomposites, resulting in obviously improved polarization loss. As a result, the Cu/C nanocomposite exhibits excellent EMA performance, where the efficient absorption bandwidth reaches 6.8 GHz, and the maximal absorption gets to −52 dB. This research provides new idea to design high-performance EMA nanocomposites by tuning the electrical conductivity and interfacial polarization.

电导率和界面极化是设计高性能电磁吸收（EMA）材料的两个关键因素，但是如何协同平衡这些因素仍然很困难。在这项工作中，我们报告了通过MOF-客体复合物的受控热解合成Cu / C纳米复合材料。制备的Cu / C纳米复合材料由交联的碳网络和各种不规则颗粒组成。碳网络提供适当的电导率以有助于电导损耗。多个异构接口，例如Mo ₂ C / C，Mo ₂ C / CuO，CuO / C，Mo ₂在这些Cu / C纳米复合材料中已确定C / Cu和Cu / C界面，从而导致极化损耗明显改善。结果，Cu / C纳米复合材料表现出出色的EMA性能，其中有效吸收带宽达到6.8 GHz，最大吸收达到-52 dB。该研究为通过调节电导率和界面极化设计高性能EMA纳米复合材料提供了新思路。