Enhanced Microwave Absorption: The Composite of Fe₃O₄ Flakes and Reduced Graphene Oxide with Improved Interfacial Polarization

Abstract

Herein, to further improve the microwave absorption performance, the composite of Fe 3 O 4 flakes and reduced graphene oxide (RGO/Fe 3 O 4) via hydrothermal method followed by H 2 reduction is rationally designed and synthesized. Compared with pure Fe 3 O 4 flakes and RGO/granular Fe 3 O 4 composite, the obtained RGO/Fe 3 O 4 exhibit remarkable enhancement of microwave absorption. The measurement results indicate that the maximum reflection loss of RGO/ Fe 3 O 4 can reach À47.2 dB at the thickness of 2.4 mm and the effective absorption bandwidth less than À10 dB reaches 6.4 GHz (from 11.36 to 17.76 GHz), much higher than that of pure Fe 3 O 4 flakes and RGO/granular Fe 3 O 4 composite. The improved performances are believed to be from the rationally designed heterointerfaces, which are created by the combination of Fe 3 O 4 flakes and graphene. The construction of abundant heterointerfaces is a valid strategy to improve the microwave absorption performance.

High-performance electromagnetic wave absorption in cobalt sulfide flower-like nanospheres

“…And the abundant defects can be regarded as the polarization center, which contributes to the polarization loss to a certain extent and helps to improve the electromagnetic wave absorption capacity. 48 Based on the Debye theory, ε ′, ε ′′ and the relationship between ε ′ and ε ′′ can be expressed as: 49 …”

A Competitive Reaction Strategy toward Binary Metal Sulfides for Tailoring Electromagnetic Wave Absorption

“…Simultaneously, during component modulation, some interfaces and defects will accordingly change, and thus, the corresponding interfacial/defect‐induced polarizations are highly adjustable, which is beneficial to the EMW attenuation. [ 5–7 ] Because of these two benefits, developing multicomponent composites has become a mainstream approach for achieving high‐performance broadband EMW absorbing materials. [ 8–16 ]…”

“…Simultaneously, during component modulation, some interfaces and defects will accordingly change, and thus, the corresponding interfacial/defect-induced polarizations are highly adjustable, which is beneficial to the EMW attenuation. [5][6][7] Because of these two benefits, developing multicomponent composites has become a mainstream solubility theory. Taking advantage of the K sp difference, [23] we can introduce different metal ions (labeled as A) as competitive reaction ions into a solution containing special metal ions (labeled as B).…”

Improvement of multiple attenuation characteristics of two-dimensional lamellar ferrocobalt@carbon nanocomposites as excellent electromagnetic wave absorbers

“…[6][7][8][9] On the one hand, the high specific surface area of low-dimensional carbon-based materials endows them with light weight and the possibility of multiple interface polarization, which are conducive to the improvement of dielectric loss. [10][11][12] On the other hand, the introduction of magnetic nanoparticles is beneficial for the formation of multiple loss abilities and optimized impedance matching considering the synergy effect of dielectric loss and magnetic loss. 13 For example, Zhu et al successfully prepared graphene-carbonyl iron cross-linked composites through a wet chemical method.…”