Architectured Graphene/Iron Microsphere Meta-Composites for Effective Microwave Dissipation

TY - JOUR

T1 - Architectured Graphene/Iron Microsphere Meta-Composites for Effective Microwave Dissipation

AU - Xie, Ruiling

AU - Li, Hongyang

AU - Zeng, Shentao

AU - Li, Hong

AU - Wang, Ran

AU - Luo, Cui

AU - Liu, Ying

N1 - Publisher Copyright: © 2026 Wiley-VCH GmbH.

PY - 2026/1

Y1 - 2026/1

N2 - Spherical Fe/graphene composite microwave-absorbing materials are synthesized with liquid-phase atomization and redox composite ball-milling process. The effects of graphene content on the microstructure, electromagnetic parameters, and wave absorption properties are investigated. Results demonstrate that Fe particles maintain a nearly spherical morphology with an average diameter of approximately 2 µm, while graphene is uniformly dispersed in a sheet-like form. The crystallographic structures of both Fe and graphene are preserved after the composite formation. As the graphene content increases, both the real and imaginary components of the dielectric constant of the composite gradually increase. The dielectric loss mechanisms transitioned from polarization relaxation dominance at low graphene content to conductivity loss dominance at higher concentrations. In terms of magnetic losses, magnetic resonance primarily governs the low-frequency range, while eddy current losses dominate at medium to high frequencies. The sample with 25% graphene content exhibits the strongest electromagnetic wave attenuation capability, while the 10% sample demonstrates optimal impedance matching characteristics. When the graphene content is 15%, and the matching thickness is 1.7 mm, the material achieves a minimum reflection loss of −19.87 dB, with an effective absorption bandwidth of 4.4 GHz at a thickness of 1.2 mm.

AB - Spherical Fe/graphene composite microwave-absorbing materials are synthesized with liquid-phase atomization and redox composite ball-milling process. The effects of graphene content on the microstructure, electromagnetic parameters, and wave absorption properties are investigated. Results demonstrate that Fe particles maintain a nearly spherical morphology with an average diameter of approximately 2 µm, while graphene is uniformly dispersed in a sheet-like form. The crystallographic structures of both Fe and graphene are preserved after the composite formation. As the graphene content increases, both the real and imaginary components of the dielectric constant of the composite gradually increase. The dielectric loss mechanisms transitioned from polarization relaxation dominance at low graphene content to conductivity loss dominance at higher concentrations. In terms of magnetic losses, magnetic resonance primarily governs the low-frequency range, while eddy current losses dominate at medium to high frequencies. The sample with 25% graphene content exhibits the strongest electromagnetic wave attenuation capability, while the 10% sample demonstrates optimal impedance matching characteristics. When the graphene content is 15%, and the matching thickness is 1.7 mm, the material achieves a minimum reflection loss of −19.87 dB, with an effective absorption bandwidth of 4.4 GHz at a thickness of 1.2 mm.

KW - composite materials

KW - graphene

KW - spherical iron

KW - wave absorption performance

UR - https://www.scopus.com/pages/publications/105027551968

U2 - 10.1002/andp.202500495

DO - 10.1002/andp.202500495

M3 - Article

AN - SCOPUS:105027551968

SN - 0003-3804

VL - 538

JO - Annalen der Physik

JF - Annalen der Physik

IS - 1

M1 - e00495

ER -