Absorbing Properties of Carbon Nanotube Films Grown on Nickel Alloy Surface

Nickel-alloy material is widely used in microwave electronic devices, and the improvement of the electromagnetic wave absorption property is important to enhance the device performance. In this work, a MWNT/Fe₃O₄ composite absorbing material film was prepared on the surface of nickel alloy by chemical vapor deposition combined with electrophoretic deposition （EPD） and spin coating respectively, and the nickel alloy component was made into a kind of absorbing material. The results show that the composite film can improve the electromagnetic wave absorption performance of nickel alloy. In the preparation process, a large number of Fe₃O₄ nanoparticles can be conveniently added to the carbon nanotube network by spin coating method. For the wave absorption properties, the minimum reflection loss of the sample prepared by electrophoretic deposition is −0.18 dB, while that of the sample prepared by the spin coating is −0.10 dB. This is mainly due to the fact that electrophoretic deposition can more precisely control the content of Fe₃O₄ in the composite material, so as to achieve the best impedance matching effect.