Graphene-based composites are becoming a new kind of microwave absorbers that can overcome the challenges related to the performance and light weight in electromagnetic pollution precaution. Herein, a series of reduced graphene oxide decorated with carbon nanopolyhedrons (CNPs/rGO) composites have been successfully fabricated through in situ pyrolysis of ZIF-8/GO hybrids. It is found that GO can restrain the growth of ZIF-8 crystals and produce small-size CNPs after high-temperature pyrolysis, and CNPs will suppress the re-stacking of rGO nanosheets. More importantly, the coupling of CNPs and rGO not only generates the desirable synergistic effects, but also accounts for the profitable interfacial polarization. Therefore, the electromagnetic parameters and microwave absorption properties of these composites can be rationally modulated in terms of the amount of GO. The optimized CNPs/rGO composite exhibits strong reflection loss [−66.2 dB (6.2 GHz, 2.89 mm)] and broad qualified bandwidth (over −10 dB in 3.2–18.0 GHz with integrated absorber thickness of 1.0–5.0 mm), which are superior to many graphene-based composites with high-density magnetic components. Electromagnetic analysis reveals that good attenuation ability and impedance matching are responsible for its excellent performance. It is believed that these results may inspire the design of lightweight microwave absorbers in the future.

石墨烯基复合材料正在成为一种新型的微波吸收剂，它可以克服电磁污染预防措施中与性能和重量轻相关的挑战。本文中，已经成功地通过原位制备了一系列用碳纳米多面体（CNPs / rGO）复合材料修饰的还原氧化石墨烯。ZIF-8 / GO杂种的热解。发现GO可以抑制ZIF-8晶体的生长并在高温热解后产生小尺寸的CNP，而CNP会抑制rGO纳米片的重新堆叠。更重要的是，CNP和rGO的偶联不仅产生了理想的协同效应，而且还解决了有利的界面极化问题。因此，可以根据GO的量合理地调节这些复合材料的电磁参数和微波吸收性能。经过优化的CNPs / rGO复合材料表现出较强的反射损耗[−66.2 dB（6.2 GHz，2.89 mm）]和较宽的合格带宽（在3.2–18.0 GHz中超过-10 dB，集成的吸收体厚度为1.0–5.0 mm），具有优越的性能。许多具有高密度磁性组分的石墨烯基复合材料。电磁分析表明，良好的衰减能力和阻抗匹配是其出色性能的原因。相信这些结果可能会启发未来轻量级微波吸收器的设计。