Here, the cobalt ferrite/carbon nanotubes nanocomposites were directly synthesized by a facile hydrothermal method at 200°C using benzyl alcohol as the solvent. The crystal and morphological structures as well as electromagnetic shielding performance at Ku band (12–18 GHz) were thoroughly investigated. Cobalt ferrite nanoparticles with a diameter around 6–10 nm were anchored on the surface of carbon nanotubes with some aggregation. It is found that the as-prepared nanocomposites exhibit excellent electromagnetic shielding performance with values 22–25 dB in the Ku frequency range with a thickness of 2 mm. The small cobalt ferrite nanoparticles offer a large number of polarization and magnetization active sites to improve the electromagnetic performance by the incorporation of carbon nanotubes.

中文翻译：

---

铁氧体钴纳米粒子/碳纳米管复合材料的制备及电磁屏蔽效能

在这里，钴铁氧体/碳纳米管纳米复合材料是通过简单的水热法在 200°C 下使用苯甲醇作为溶剂直接合成的。彻底研究了Ku波段（12-18 GHz）的晶体和形态结构以及电磁屏蔽性能。直径约 6-10 nm 的钴铁氧体纳米颗粒固定在碳纳米管表面，并有一定的聚集。结果表明，所制备的纳米复合材料表现出优异的电磁屏蔽性能，在 Ku 频率范围内具有 22-25 dB 的值，厚度为 2 mm。小的钴铁氧体纳米颗粒提供了大量的极化和磁化活性位点，通过掺入碳纳米管来改善电磁性能。