Abstract A novel electromagnetic wave absorber of three-dimensional carbon networks decorated with CoFe2O4 nanoparticles (3DC/CoFe2O4) was prepared through a simple freeze-drying method followed by a high-temperature calcination process. The 3DC/CoFe2O4 composite prepared at 630 °C (S630) exhibits broadband electromagnetic wave absorption with only 20 wt% filler loading. The effective absorption bandwidth (reflection loss [RL] < −10 dB) of S630 reaches up 6.63 GHz, and the minimum RL of −19.5 dB is obtained at 15.45 GHz when the matching thickness is 2.5 mm. The excellent electromagnetic wave absorption performance of the 3DC/CoFe2O4 composite can be attributed to good impedance matching and strong attenuation capacity.

中文翻译：

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用 CoFe2O4 纳米颗粒复合材料装饰的三维碳网络：制备和宽带电磁波吸收性能

摘要 通过简单的冷冻干燥和高温煅烧工艺制备了一种新型的由 CoFe2O4 纳米粒子装饰的三维碳网络电磁波吸收体（3DC/CoFe2O4）。在 630 °C (S630) 下制备的 3DC/CoFe2O4 复合材料表现出宽带电磁波吸收，仅填充 20 wt% 的填料。S630的有效吸收带宽（反射损耗[RL] < -10 dB）最高可达6.63 GHz，匹配厚度为2.5 mm时，在15.45 GHz处获得的最小RL为-19.5 dB。3DC/CoFe2O4 复合材料优异的电磁波吸收性能可归因于良好的阻抗匹配和强大的衰减能力。