Carbon nanotube-decorated nitrogen-doped carbon-coated nickel (CNT/Ni@N-C) microspheres have been fabricated by pyrolyzing the mixture of nickel-based metal organic framework (Ni-MOF) and melamine. The resultant composite is assembled from CNTs and spherical Ni@N-C composite. Besides, the CNT/Ni@N-C composite contains abundant nitrogen (N) dopants that contribute to defect dipole polarization. The melamine content is important for controlling the amount of N element and N dopant state in the composite. The optimized CNT/Ni@N-C composite with high content of pyridinic N exhibits strong absorption of −55.1 dB at 10.56 GHz with the thickness of 2.5 mm, and the effective absorbing bandwidth (reflection loss < −10 dB) is 11.2 GHz (6.0–17.2 GHz) with the thickness range of 1.5–4.0 mm. These results indicate that the N content and N dopant state have a great influence on electromagnetic wave absorption properties. This strategy will contribute to fabricate the carbon hybrid network consisting of metal organic frameworks derived metal/carbon hybrid and CNTs for electromagnetic wave absorption.

碳纳米管修饰的氮掺杂碳包覆的镍（CNT / Ni @ NC）微球是通过热解镍基金属有机骨架（Ni-MOF）和三聚氰胺的混合物制成的。所得复合材料由CNT和球形Ni @ NC复合材料组装而成。除此之外，CNT / Ni @ NC复合材料还包含大量的氮（N）掺杂剂，这些元素有助于缺陷偶极子极化。三聚氰胺含量对于控制复合材料中N元素的含量和N掺杂状态非常重要。经过优化的高吡啶金属N含量的CNT / Ni @ NC复合材料在10.56 GHz处具有2.5mm的厚度，吸收强度为-55.1 dB，厚度为2.5 mm，有效吸收带宽（反射损耗<-10 dB）为11.2 GHz（6.0– 17.2 GHz），厚度范围为1.5–4.0 mm。这些结果表明，N含量和N掺杂状态对电磁波吸收特性有很大的影响。该策略将有助于制造由金属有机骨架衍生的金属/碳杂化物和用于电磁波吸收的碳纳米管组成的碳杂化网络。