Synthesis of Carbon Nanotubes on Cerium-Substituted Barium Ferrite Substrate by Chemical Vapor Deposition for Preparation of a Microwave Absorbing Nanocomposite

In this research, at first, Ce-substituted barium ferrite, BaCe0.2Fe11.8O19 was prepared via the sol-gel method as a substrate and then Carbon NanoTubes (CNTs) was synthesized on the surface of the substrate by Chemical Vapor Deposition (CVD) technique. The structure, morphology, and electromagnetic performance of the synthesized nanocomposites were characterized by XRD, FE-SEM, and Vibrating Sample Magnetometer (VSM), respectively. The results indicated that the BaCe0.2Fe11.8O19 particles were coated by CNTs, and the nanocomposite has magnetic properties. Therefore, the electromagnetic properties including complex permittivity (εr), the permeability (μr), and microwave absorption properties were investigated using a vector network analyzer. It was found that in the nanocomposite, because of the presence of CNTs, the Reflection Loss (RL) widely increased. The maximum reflection loss in the frequency range of 8-12 GHz for 2.5 mm thickness was -49.61 dB at 9.0 GHz. The results suggest that prepared nanocomposite can be suitable in the microwave absorbing coatings.