Electromagnetic absorption materials: Current progress and new frontiers

Progress in Materials Science, Journal Year: 2022, Volume and Issue: 127, P. 100946 - 100946

Published: March 17, 2022

Language: Английский

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Broadband multispectral compatible absorbers for radar, infrared and visible stealth application

Progress in Materials Science, Journal Year: 2023, Volume and Issue: 135, P. 101088 - 101088

Published: Feb. 4, 2023

Language: Английский

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Ultrabroad Microwave Absorption Ability and Infrared Stealth Property of Nano-Micro CuS@rGO Lightweight Aerogels

Nano-Micro Letters, Journal Year: 2022, Volume and Issue: 14(1)

Published: Aug. 20, 2022

Developing ultrabroad radar-infrared compatible stealth materials has turned into a research hotspot, which is still problem to be solved. Herein, the copper sulfide wrapped by reduced graphene oxide obtain three-dimensional (3D) porous network composite aerogels (CuS@rGO) were synthesized via thermal reduction ways (hydrothermal, ascorbic acid reduction) and freeze-drying strategy. It was discovered that phase components (rGO CuS phases) micro/nano structure (microporous nanosheet) well-modified modulating additive amounts of changing ways, resulted in variation pore structure, defects, complex permittivity, microwave absorption, radar cross section (RCS) value infrared (IR) emissivity. Notably, obtained CuS@rGO with single dielectric loss type can achieve an bandwidth 8.44 GHz at 2.8 mm low filler content 6 wt% hydrothermal method. Besides, aerogel realizes minimum reflection (RLmin) - 60.3 dB lower 2 wt%. The RCS reach 53.3 m2, effectively reduces probability target being detected detector. Furthermore, laminated architecture multicomponent endowed insulation IR versatility. Thus, this work offers facile method design develop rGO-based absorbers radar-IR stealth.

Language: Английский

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Structural Defects in Phase‐Regulated High‐Entropy Oxides toward Superior Microwave Absorption Properties

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 33(1)

Published: Oct. 27, 2022

Abstract High‐entropy (HE) oxides have become increasingly popular as electromagnetic wave‐absorbing materials owing to their customizable structure and unique HE effects. However, the weak loss property of single‐phase ceramics approaches implemented improve them based on semi‐empirical rules severely limit development. Herein, two biphasic are prepared by simple sintering realize accurate regulation crystal phases structural defects. It is verified that effects cause various defects beneficial for microwave dissipation within complex‐phase ceramics. In spinel/perovskite oxides, around interface spinel (111) perovskite (110) planes, notable stress concentrations lattice distortions directly observed, inducing numerous point stacking faults. Interestingly, besides existing heterogeneous rock salt (220)/spinel (220) plane defects, salt/spinel enabled synergistic via precise components’ phase. Driven multi‐phases in complexes, intense polarization evidently found, confirmed first‐principles calculations. Accordingly, demonstrate excellent absorption performance, minimal reflection −54.5 dB achieved. Therefore, this study provides valuable guidelines design absorbers using oxides.

Language: Английский

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Hierarchical Engineering of Double‐Shelled Nanotubes toward Hetero‐Interfaces Induced Polarization and Microscale Magnetic Interaction

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(33)

Published: June 1, 2022

Abstract Hierarchical engineering of suitable dielectric‐magnetic multicomponents shows good performance for microwave absorbers, but still face bottlenecks. Herein, hierarchical double‐shelled nanotubes (DSNTs), in which the inner magnetic tubular subunits are assembled by magnetic‐heteroatomic components through cation‐exchange reactions, and outer dielectric MnO 2 nanosheets strengthen synergistic interactions between confined heterogeneous interfaces ingeniously designed constructed. Hetero‐interfaces induced polarization is proposed to investigate interfacial relaxation mechanism, loss, closely related micrometer‐scale units, mainly clarified interaction composed coupling diffraction; both them clearly confirmed Lorentz off‐axis electron holography. The obtained DSNTs demonstrate efficient absorption with an optimal reflection loss −54.7 dB qualified bandwidth 9.5 GHz owing desirable interfaces, multiple heteroatomic hollow microstructures. This strategy inspires a generalized methodology configurations multishells, combination hetero‐interfaces microscale broadens mechanism topography–performance relationship materials.

Language: Английский

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Ni Flower/MXene-Melamine Foam Derived 3D Magnetic/Conductive Networks for Ultra-Efficient Microwave Absorption and Infrared Stealth

Nano-Micro Letters, Journal Year: 2022, Volume and Issue: 14(1)

Published: Feb. 21, 2022

The development of multifunctional and efficient electromagnetic wave absorbing materials is a challenging research hotspot. Here, the magnetized Ni flower/MXene hybrids are successfully assembled on surface melamine foam (MF) through electrostatic self-assembly dip-coating adsorption process, realizing integration microwave absorption, infrared stealth, flame retardant. Remarkably, Ni/MXene-MF achieves minimum reflection loss (RLmin) - 62.7 dB with corresponding effective absorption bandwidth (EAB) 6.24 GHz at 2 mm an EAB 6.88 1.8 mm. Strong attributed to three-dimensional magnetic/conductive networks, which provided excellent impedance matching, dielectric loss, magnetic interface polarization, multiple attenuations. In addition, endows low density, heat insulation, flame-retardant functions. This work new strategy for design materials.

Language: Английский

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Confined Diffusion Strategy for Customizing Magnetic Coupling Spaces to Enhance Low‐frequency Electromagnetic Wave Absorption

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(16)

Published: Feb. 7, 2023

Abstract The rational design of magnetic composites has great potential for electromagnetic (EM) absorption, particularly in the low‐frequency range 2–8 GHz. However, scalable synthesis such absorbers with both high content and good dispersity remains challenging. In this study, a confined diffusion strategy is proposed to fabricate functional magnetic‐carbon hollow microspheres. Driven by ferromagnetic enhanced Kirkendall effect, situ alloying FeCo nanoparticles tightly carbon shells, effectively inhibiting agglomeration. Moreover, core–shell FeCo–carbon nano‐units further assemble into dispersive microscale Janus bulges on inner outer surfaces microsphere. optimized FeCo@C microspheres exhibit excellent EM wave absorption performance: minimum reflection loss ( RL min ) −35.9 dB, bandwidth covers almost entire C‐band. Systematic investigation reveals that large size integration, high–density units, strong coupling are essential enhancing dissipation waves. This study provides novel fabricating advanced significant inspiration investigating attenuation mechanism at low frequency.

Language: Английский

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One-Dimensional Magnetic FeCoNi Alloy Toward Low-Frequency Electromagnetic Wave Absorption

Nano-Micro Letters, Journal Year: 2022, Volume and Issue: 14(1)

Published: Aug. 20, 2022

Rational designing of one-dimensional (1D) magnetic alloy to facilitate electromagnetic (EM) wave attenuation capability in low-frequency (2-6 GHz) microwave absorption field is highly desired but remains a significant challenge. In this study, composite EM absorber made FeCoNi medium-entropy embedded 1D carbon matrix framework rationally designed through an improved electrospinning method. The 1D-shaped demonstrates the high-density and continuous network using off-axis electronic holography technique, indicating excellent loss ability under external field. Then, in-depth analysis shows that many factors, including anisotropy intrinsic physical features alloy, primarily contribute enhanced performance. Therefore, fabricated increasing effective band 1.3 GHz at ultrathin thickness 2 mm. Thus, study opens up new method for design preparation high-performance absorbers.

Language: Английский

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Ultralight Magnetic and Dielectric Aerogels Achieved by Metal–Organic Framework Initiated Gelation of Graphene Oxide for Enhanced Microwave Absorption

Nano-Micro Letters, Journal Year: 2022, Volume and Issue: 14(1)

Published: April 19, 2022

Metal-organic frameworks (MOFs) are used to directly initiate the gelation of graphene oxide (GO), producing MOF/rGO aerogels. The ultralight magnetic and dielectric aerogels show remarkable microwave absorption performance with ultralow filling contents. development a convenient methodology for synthesizing hierarchically porous comprising metal-organic (GO) building blocks that exhibit an density uniformly distributed MOFs on GO sheets is important various applications. Herein, we report facile route MOF/reduced (rGO) based GO, which initiated using MOF crystals. Free metal ions exposed surface MIL-88A nanorods act as linkers bind nanosheets three-dimensional network via metal-oxygen covalent or electrostatic interactions. MOF/rGO-derived Fe3O4@C/rGO Ni-doped notable (MA) performance, simultaneously achieving strong broad bandwidth at low thickness 2.5 (- 58.1 dB 6.48 GHz) 2.8 mm 46.2 7.92 contents 0.7 0.6 wt%, respectively. attenuation ability prepared further confirmed radar cross-sectional simulation, attributed synergistic effects their structures heterointerface engineering. This work provides effective pathway fabricating hybrid offers MA.

Language: Английский

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Hollow engineering of sandwich NC@Co/NC@MnO2 composites toward strong wideband electromagnetic wave attenuation

Journal of Material Science and Technology, Journal Year: 2023, Volume and Issue: 175, P. 194 - 203

Published: Sept. 6, 2023

Language: Английский

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