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

Abstract

<em>In this research, at first, Ce-substituted barium ferrite, BaCe_0.2Fe_11.8O₁₉ was prepared via the sol-gel method as a substrate and then Carbon NanoTubes (CNTs) was synthesized </em><em>on the surface of the substrate by Chemical Vapor Deposition (CVD) technique. The structure, morphology,</em><em> and electromagnetic performance of the synthesized nanocomposites were characterized by </em><em>XRD, FE-SEM, and Vibrating Sample Magnetometer (VSM), respectively. The results indicated that </em><em>the </em><em>BaCe_0.2Fe_11.8O₁₉particles were coated by CNTs, and the nanocomposite has magnetic properties.</em><em> Therefore, t</em><em>he electromagnetic properties including </em><em>complex </em><em>permittivity (ε_r), the permeability (µ_r), 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. </em><em>The maximum reflection loss in the frequency range of 8-12 GHz </em><em>for 2.5 mm </em><em>thickness </em><em>was -49.61 dB at 9.0 GHz. </em><em>The results suggest that prepared nanocomposite can be suitable </em><em>in the microwave absorbing coatings.</em>