Iron coated carbon nanotube (CNT) nanocomposite absorbents were prepared by a metal organic chemical vapor deposition method using carbonyl iron as the Fe precursor. The microstructures and electromagnetic properties of the composites were characterized by XRD, FESEM, TEM, and a vector network analyzer. Results show that the morphology and microwave absorption properties of these core-shell composites are controlled by changing the deposition temperature. The number of iron nanoparticles deposited on the surface of the CNTs gradually increases with increasing deposition temperature in the range 210–240 ^oC. Too high a temperature (270 ^oC) causes agglomeration of the Fe nanoparticles on the surface of the CNTs. When the thickness of the electromagnetic coating is 2.9 mm, the composite prepared at 240 ^oC has the best microwave absorption, with a maximum absorption bandwidth of 6.1 GHz (10.2-16.3 GHz), a minimum reflectivity of −28.3 dB and an absorption intensity less than −10 dB at 6.1 GHz.

通过金属有机化学气相沉积法，以羰基铁为Fe前驱体制备了铁包覆的碳纳米管（CNT）纳米复合吸收剂。用XRD，FESEM，TEM和矢量网络分析仪对复合材料的微观结构和电磁性能进行了表征。结果表明，通过改变沉积温度可以控制这些核壳复合材料的形貌和微波吸收性能。在210–240 ^o C范围内，随着沉积温度的升高，沉积在CNT表面上的铁纳米颗粒的数量逐渐增加。温度过高（270 ^oC）引起在CNT表面上的Fe纳米颗粒的附聚。当电磁涂层的厚度为2.9 mm时，在240 ^o C下制备的复合材料具有最佳的微波吸收性能，最大吸收带宽为6.1 GHz（10.2-16.3 GHz），最小反射率为-28.3 dB，吸收强度为在6.1 GHz时小于-10 dB。