Electromagnetic Wave Absorption Properties of Barium Ferrite/Reduced Graphene Oxide Nanocomposites

Reduced graphene oxide (rGO) and M-type hexagonal ferrites such as BaFe۱۲O۱۹ have attracted great attention as electromagnetic (EM) wave absorbing materials in recent years. In this research, different weight percents of BaFe۱۲O۱۹/rGO nanocomposites were incorporated into the microwave absorbing layers and their EM wave absorption was investigated. Barium ferrite was synthesized through the co-precipitation method. Graphene oxide (GO) was synthesized through the modified Hummers’ method. The synthesized GO was reduced to rGO nanosheets using a reducing agent. The synthesized barium ferrite and rGO were then mechanically milled to form BaFe۱۲O۱۹/rGO nanocomposite. The chemical bondings, phase analysis, magnetic properties, particle morphology, and EM wave absorbing properties were investigated using FTIR, XRD, Vibration Sample Magnetometer (VSM), FESEM, and Vector Network Analyzer (VNA), respectively. The saturation magnetization (Ms) and the coercivity (Hc) of the synthesized BaFe۱۲O۱۹/rGO nanocomposite were ۳۱ emu/g and ۱.۵ kOe, respectively. The EM absorption properties in the X-band (۸.۲-۱۲.۴ GHz) showed that the maximum reflection loss (RL) of -۷.۳۹ dB could be obtained for the nanocomposite containing only ۱۰ wt. % of BaFe۱۲O۱۹/rGO nanocomposite in a resin matrix with a thickness of ۲ mm.

Keywords:

Barium ferrite , Reduced graphene Oxide , Magnetic properties , electromagnetic wave absorption