Iron carbide interface modulating for synergies of 3D-graphene-like and iron-coated Fe3O4 particles for high microwave absorption performance

Porous Carbonaceous Aerogels Composed of Multiscale Carbon-Based Units for High-Performance Microwave Absorption

“…Furthermore, by combining the lightweight carbon materials of RGO, CNTs, and CNCs and utilizing the synergistic functions of them, three mass ratios of RGO/CNC/CNT aerogels exhibit extremely enhanced EMW absorption performance. Outstandingly, the RCT1 aerogel shows the best absorption intensity with the minimum RL value of −53.55 dB and the best EAB of 6.18 GHz at 2.3 mm thickness (Figure d,j) compared with other samples, which is attributed to the collaborative multiple loss mechanisms of the conductive loss of CNTs, the cross-polarization loss and excellent impedance matching brought by CNCs, and the effective polarization loss originating from RGO . Inspired by the above thoughts, the absorption properties of two other aerogels with different mass ratios between CNCs and CNTs were further characterized to explore broader applications.…”

“…Outstandingly, the RCT1 aerogel shows the best absorption intensity with the minimum RL value of −53.55 dB and the best EAB of 6.18 GHz at 2.3 mm thickness (Figure 5d,j) compared with other samples, which is attributed to the collaborative multiple loss mechanisms of the conductive loss of CNTs, the cross-polarization loss and excellent impedance matching brought by CNCs, and the effective polarization loss originating from RGO. 49 Inspired by the above thoughts, the absorption properties of two other aerogels with different mass ratios between CNCs and CNTs were further characterized to explore broader applications. As illustrated in Figure 5e,k, the Figure 5m shows the statistical values of optimal RL and EAB values of all samples in column diagrams.…”

Electromagnetic Absorption by Magnetic Oxide Nanomaterials: A Review

“…Hui Zheng et al employed vacuum heat treatment to form an iron carbide (FeC) interface between 3d-graphene-like and iron-clad Fe 3 O 4 particles. 83 The results showed that the formation of the FeC interface had to be at a limited temperature to produce interfacial polarization and maximize the synergistic loss effect of 3D graphene and Fe 3 O 4 (Figure 5d). Specifically, the EAB of the 3D graphene/FeC/ Fe 3 O 4 composite was 5.28 GHz, with an RL of −53.52 dB and a thickness of 1.75 mm.…”

“…(d) Schematic diagram of electromagnetic wave absorption mechanism of a three-dimensional graphene/FeC/Fe/Fe 3 O 4 composite. Reproduced with permission from ref . Copyright 2023 Elsevier.…”

“…At a doping rate of 6 wt %, the minimum RL is −60.65 dB, the EAB is 6.36 GHz (10.24–16.6 GHz), and the thickness is 2.5 mm. Hui Zheng et al employed vacuum heat treatment to form an iron carbide (FeC) interface between 3d-graphene-like and iron-clad Fe 3 O 4 particles . The results showed that the formation of the FeC interface had to be at a limited temperature to produce interfacial polarization and maximize the synergistic loss effect of 3D graphene and Fe 3 O 4 (Figure d).…”