Abstract Metal Cu/C nanocomposites were prepared by a facile one-step encapsulation process and then annealing the mixture of organic carbon compound and metal nitrate. Morphology detection indicated that Cu nanoparticles were uniformly anchored in the porous carbon matrix. An electromagnetic (EM) wave absorption of Cu/C nanocomposites with various mass proportions of porous carbon was performed in the frequency range of 1.0–18.0 GHz. The structure and morphology of Cu/C nanocomposites could be tuned by changing the carbon proportion for obtaining suitable electromagnetic parameters, which resulted in a superior EM wave absorption property. For Cu/C 1–3 nanocomposites, the reflection loss values of −46 dB were obtained at 17.0 GHz with a rather thin thickness of 1.4 mm and exceed −20 dB in the range of 7.4–18.0 GHz for the thickness 1.4–2.8 mm. The Cu/C nanocomposite exhibited excellent EM wave absorption performance under a rather thin thickness, which suggested that Cu/C nanocomposite could be regarded as a promising candidate for high-performance EM wave absorber.

中文翻译：

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嵌入多孔碳中的金属铜纳米粒子作为高频电磁波的高反射损耗吸收剂

摘要 金属Cu/C纳米复合材料是通过简单的一步包封工艺，然后对有机碳化合物和金属硝酸盐的混合物进行退火制备的。形态学检测表明，Cu纳米颗粒均匀地锚定在多孔碳基质中。在 1.0-18.0 GHz 的频率范围内对具有不同质量比例的多孔碳的 Cu/C 纳米复合材料进行电磁 (EM) 波吸收。Cu/C纳米复合材料的结构和形貌可以通过改变碳比例来调整以获得合适的电磁参数，从而获得优异的电磁波吸收性能。对于 Cu/C 1-3 纳米复合材料，在 17.0 GHz 下获得了 -46 dB 的反射损耗值，厚度为 1.4 毫米，并且在 7.4-18.0 GHz 范围内，厚度为 1.4-2.8 毫米时超过 -20 dB .