Transition metals and carbon materials are known as electromagnetic wave (EMW) nemesis, which can effectively attenuate EMW in the 2-18 GHz frequency band. Herein, three typical transition metal (Fe, Co, Ni) are freely combined into three layered double hydroxides (LDHs) through hydrothermal method and successfully grown in situ on the surface of short carbon fibers (SCFs). The SEM images show that although the three LDHs (CoNi-LDHs, FeNi-LDHs and FeCo-LDHs) are all sheet-like structures, their respective morphologies are completely different and each has its own merits. After calcination treatment at 500 ℃, their distinct morphologies are basically retained, while the EMW absorption properties are greatly improved dramatically. Their effective absorption bandwidth (f_e) (RL ≤ −10 dB) reached 3.68 GHz, 1.68 GHz and 4.48 GHz at thicknesses of 2.2 mm, 2.2 mm and 2.0 mm, respectively. As an important transition metal-based material, the exploration of LDHs in EMW absorption has just begun.

过渡金属和碳材料被称为电磁波（EMW）克星，它可以有效衰减2-18 GHz频带内的EMW。在此，通过水热法将三种典型的过渡金属（Fe，Co，Ni）自由组合成三层双氢氧化物（LDHs），并成功地在短碳纤维（SCFs）的表面上原位生长。SEM图像显示，尽管三个LDH（CoNi-LDH，FeNi-LDH和FeCo-LDH）均为片状结构，但它们各自的形态完全不同，各有千秋。经过500℃的煅烧处理后，它们的形态基本得以保留，而EMW的吸收性能大大改善。它们的有效吸收带宽（f _e）（RL≤-10 dB）分别达到2.2毫米，2.2毫米和2.0毫米的厚度达到3.68 GHz，1.68 GHz和4.48 GHz。作为重要的过渡金属基材料，LDH在EMW吸收中的探索才刚刚开始。