Fabrication of a highly efficient multilayer microwaves insulator based on CuFe2O4/(Pb1−xLax)/(Zr1−yTiy)O3 (composite: 7/60/40) (0 ≤ x, y ≤ 1) and Cu-doped g-C3N4 nanograins. (November 2022)

• Record Type: Journal Article
• Authors: Alizadeh, Taher; Kadkhodayan, Hossein
• Is Part Of: Journal of physics and chemistry of solids. Volume 170(2022)
• Publication Date: 2022-11
• Subjects: Microwaves -- Lead zirconium titanate -- Reflection loss -- Copper-doped carbon nitride graphitic -- Absorption -- Impedance; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2022.110941
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: Nowadays, microwave pollution is a major concern around the world. Therefore, the construction of multilayer microwave absorbers with low thickness and wide bandwidth has been investigated. A novel multilayer broadband microwave insulator with high performance containing fillers comprised of copper ferrite spinel (CuFe2 O4 ) nanograins (NGs), lead zirconium titanate ceramic (Pb1−xLax)(Zr1−yTiy)O3 (composite: 7/60/40) (0≤x, y ≤ 1) (PLZT) nanoparticles (NPs), and copper-doped carbon nitride graphitic (Cu-doped g-C3 N4 ) nanosheets (NS) based on epoxy resin has been successfully prepared. The crystal structure and morphology of synthesized nanograins were specified using XRD, SEM, and EDX/mapping analysis. In addition, the microwave absorption properties of the resulting multilayer microwave insulator were evaluated using a vector network analyzer (VSM) in the frequency range of 8–12 GHz. Response surface methodology (RSM) was applied to the design of experiments to reduce the experimental time and cost, and obtain the optimal conditions. The weight percentage (wt.%) of CuFe2 O4 magnetic nanograins, (Pb1−xLax)(Zr1−yTiy)O3 (0 ≤ x, y ≤ 1) dielectric NGs, Cu-doped g-C3 N4 electric conductivity nanosheets, and thickness of the designed insulators were optimized using the RSM method to attain a multilayer microwave insulator with the optimal microwaves absorption efficiency. The minimum reflection loss (maximum absorption efficiency) was determined to be < –30 dB (absorption >99.9%) for the optimized multilayer microwaves insulator under the conditions of 3.0 wt% CuFe2 O4 magnetic nanoparticles, 5 wt% (Pb1−xLax)(Zr1−yTiy)O3 (0≤x, y ≤ 1) dielectric NGs, 1.0 wt% Cu-doped g-C3 N4 electric conductive nanosheets with 1 mm thickness in the microwave frequency range of 8–12 GHz (X-band). The highest attenuation coefficient (>500 dB/m) showed that the microwaves energy was weakened. In addition, the minimum reflection coefficient (maximum transmission coefficient) was calculated to be ∼0.01 (RL = −35 dB, AL = 99.99%). Finally, the obtained results show that these factors and their levels were correctly selected for the fabrication of high-performance multilayer microwave insulators. Graphical abstract: Image 1 Highlights: The new multilayer MWs insulator with high absorption properties was successfully synthesized. The RSM/CCD approach was applied to optimize formulations. The optimized multilayer MWs insulator had reflection loss ˂ −30 dB (absorption ˃ 99.9%) with high broadband.