High Dielectric Fe₃O₄ and Fe₂O₃ Nanoparticles Deposited on Graphite Nanosheets\nfor Electromagnetic Wave Absorption

Abstract

Fe₃O₄/graphite nanosheets (GNs) nanocomposites\nwere obtained by the solvothermal method and calcined in an air environment\nto obtain Fe₂O₃/GNs nanocomposites. The phase\nand microstructure can clearly demonstrate the evolution process of\nFe₃O₄/GNs to Fe₂O₃/GNs\nnanocomposites. The Fe₃O₄/GNs nanocomposites\nwill be converted from Fe₃O₄ to Fe₂O₃ during calcination to form nanoparticles. When the\ncalcination temperature is 250 °C, the glucose on the surface\nof the S-250 sample begins to carbonize, resulting in an excellent\nreflection loss value of −66.593 dB when the thickness is 2.8\nmm and the effective absorption bandwidth is 3.28 GHz. The mutual\ncontact between the nanoparticles and GNs makes the composites produce\nmore interface/dipole polarization and better impedance matching.\nCalcination converts Fe₃O₄/GNs to Fe₂O₃/GNs, which is a high-performance design with a unique\nstructure and has potential applications in the field of electromagnetic-wave\nabsorption.