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

Abstract

Reduced graphene oxide (rGO) and M-type hexagonal ferrites such as BaFe12O19 have attracted great attention as electromagnetic (EM) wave absorbing materials in recent years. In this research, different weight percents of BaFe12O19/rGO nanocomposites were incorporated into the microwave absorbing layers and their EM wave absorption was investigated. Barium ferrite was synthesized through the coprecipitation 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 BaFe12O19/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 BaFe12O19/rGO nanocomposite were 31 emu/g and 1.5 kOe, respectively. The EM absorption properties in the X-band (8.2-12.4 GHz) showed that the maximum reflection loss (RL) of -7.39 dB could be obtained for the nanocomposite containing only 10 wt. % of BaFe12O19/rGO nanocomposite in a resin matrix with a thickness of 2 mm.

Reduced Graphene Oxide/Barium Ferrite Ceramic Nanocomposite Synergism for High EMI Wave Absorption

“…On the other hand, conductive carbon-based shielding materials, such as reduced graphene oxide (RGO) and carbon nanotubes (CNTs), have low density and high dielectric loss, making them good electromagnetic wave absorbers. − Since it was difficult to offer a shielding material with good magnetic and dielectric losses, composites attracted researchers’ interest in surpassing the limitations of the individual material and offering a wide variety of combinations to promote composite-shielding capabilities by fine tuning its magnetic and dielectric losses. − RGO has shown potential as a shielding agent among all carbonaceous materials due to its excellent conductivity and high surface area. In addition, its preparation using the top-down chemical synthesis approach had the advantage of being easily processed with a high yield, making it a promising candidate in many composites. − The enhancement reached through the formation of ceramic composites depends on the synergistic effect of dielectric and magnetic losses, which promote interfacial polarization and charge transfer, leading to an effective EMI ceramic sheet absorber. , This phenomenon provides composites with different permittivity and permeability values, which rely on the ratio between conductive and magnetic particles altering their impedance and raising their absorption shielding performance besides the consistent arrangement of minute nanoparticles. − The known ceramic formation techniques are slip casting, additive manufacturing, and technical ceramics. , The technical ceramic technique is widely used for dry powder processing into the required shape via mechanical or hydraulic powder compacting presses selected for the necessary force and powder fill depth. The creation of the basic shape of a component is achieved by compacting powder material through the application of external pressure using either single-action or double-action compaction techniques .…”

Effect of nGO on Morphology, Mechanical Properties and Thermal Behavior of PLA/nGO Sheets Before and After Thermoforming: An Experimental Study

“…Recent researches have been shown that nano graphene oxide (nGO) is a suitable alternative for nanoclay in polymer matrix due to low density, high thermal conductivity, and high mechanical properties [11][12][13][14]. One of the attractive features of nGO is good interaction and combability with polymer matrices due to the polar structures of GO (containing carbonyls, hydroxyls, and epoxides groups) [15].…”

Development of a Non-Iterative Macromodeling Technique by Data Integration and Least Square Method

“…In some cases, the complexity is due to the electrical size of the structure leading to an unreasonable number of unknowns. Especially with increasing frequency, fully detailed analysis has become the main requirement for all stateof-the-art circuit design and simulations [4,5]. Furthermore, simulators face trouble in simulating the structures in the presence of nonlinear components due to mixed frequency/time problems as well as CPU inefficiency [6,7].…”