Constructing two-dimensional materials with large specific surface area is of great significance for electromagnetic (EM) waves absorption. Herein, through adding hexamethylenetetramine (HMT) and F127, the thickness of the two-dimensional (2D) nickel metal organic frameworks (Ni-MOFs) nanosheets was altered. The composites with larger specific surface area are adjusted by pyrolysis in argon. Besides, the synergetic effect of dielectric loss and magnetic loss for the Ni/C composites modified with carbon nanotubes (Ni/C-CNTs) are favorable for the attenuation of EM wave. A maximum reflection loss (RL_max) of −71.6 dB is achieved and the effective absorption bandwidth is 4.7 GHz at thin thickness (2.2 mm) in the case of containing only 10 wt% of the samples in the matrix. The lightweight and controllable thickness of Ni/C carbon nanotubes composites with excellent EM absorption properties endow them with potential applications in the EM waves absorption.

构造具有大比表面积的二维材料对于吸收电磁（EM）波具有重要意义。在此，通过添加六亚甲基四胺（HMT）和F127，改变了二维（2D）镍金属有机骨架（Ni-MOFs）纳米片的厚度。通过在氩气中热解来调节具有较大比表面积的复合材料。另外，碳纳米管（Ni / C-CNTs）改性的Ni / C复合材料的介电损耗和磁损耗的协同效应有利于电磁波的衰减。最大反射损耗（RL _max在基质中仅包含10 wt％的样品的情况下，可达到-71.6 dB的）且在薄厚度（2.2 mm）处的有效吸收带宽为4.7 GHz。具有优异的EM吸收性能的Ni / C碳纳米管复合材料的轻巧且可控制的厚度使其在EM波吸收方面具有潜在的应用前景。