In this study, we have successfully synthesized porous CoO–Co@RGO composites using GO and Co-based metal-organic frameworks (MOFs) as precursors. Due to particular structures and advantageous characteristics, the synthesized porous CoO–Co@RGO composites exhibit outstanding electromagnetic (EM) wave absorbing properties with a filler loading of 10[Formula: see text]wt.% in wax matrix. The maximum reflection loss (RL) of the prepared porous CoO–Co@RGO was [Formula: see text][Formula: see text]dB with 2.1[Formula: see text]mm thickness, and the effective absorption bandwidth as wide as 6.24[Formula: see text]GHz (11.76–18[Formula: see text]GHz), which covers the full Ku-band. Remarkably, the achieved all values of[Formula: see text]RL were under [Formula: see text][Formula: see text]dB with 1.0–5.0[Formula: see text]mm thickness, the corresponding to bandwidth range can be tuned to 13.84[Formula: see text]GHz (4.16–18[Formula: see text]GHz). The superior absorbing performance is attributed to suitable magnetic loss, high dielectric loss and large attenuation mainly caused by conduction loss and polarization relaxation.

中文翻译：

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源自金属有机框架的具有优化阻抗匹配的多孔 CoO-Co@RGO 复合材料的高效电磁波吸收

在这项研究中，我们以 GO 和 Co 基金属有机框架（MOF）为前驱体，成功合成了多孔 CoO-Co@RGO 复合材料。由于特殊的结构和有利的特性，合成的多孔 CoO-Co@RGO 复合材料表现出出色的电磁 (EM) 波吸收性能，在蜡基中填充量为 10[公式：见正文]wt.%。制备的多孔CoO–Co@RGO的最大反射损耗（RL）为[公式：见文][公式：见文]dB，厚度为2.1[公式：见文]mm，有效吸收带宽宽达6.24 [公式：见文]GHz（11.76-18[公式：见文]GHz），覆盖全Ku波段。值得注意的是，[公式：见文本]RL的所有值均低于[公式：见文本][公式：见文本]d​​B，厚度为1.0-5.0[公式：见文本]mm，对应的带宽范围可以调到13.84[公式：见文]GHz（4.16-18[公式：见文]GHz）。优异的吸收性能归因于合适的磁损耗、高介电损耗和主要由传导损耗和极化弛豫引起的大衰减。