A Review on Graphene‐Based Electromagnetic Functional Materials: Electromagnetic Wave Shielding and Absorption

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(42)

Published: July 1, 2022

Abstract Electromagnetic (EM) functional materials play an increasingly important role in solving EM wave pollution both modern military and civil fields. Graphene‐based are the most promising candidates applications of shielding absorption owing to their remarkable structures enhanced properties. Designing graphene‐based with elaborately controlled microstructures optimized properties can effectively improve energy attenuation conversion. Herein, study begins mechanism, multiscale design strategies outlined, including molecular‐scale, micro/nanoscale structure, macroscale integration assembly strategies. Applications fields reviewed, focusing on latest advances assemblies such as films, fabrics, composites. Finally, current challenges future directions this fast‐growing field predicted.

Language: Английский

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Clarification of basic concepts for electromagnetic interference shielding effectiveness

Journal of Applied Physics, Journal Year: 2021, Volume and Issue: 130(22)

Published: Dec. 10, 2021

There exists serious miscomprehension in the open literature about electromagnetic interference shielding effectiveness (EMI SE) as a critical index to evaluate performance, which is misleading graduates and newcomers embarking on field of materials. EMI SE defined sum three terms including reflection loss, absorption loss multiple classical Schelkunoff theory, while it decomposed into two named practice, called Calculation theory here. In this paper, we elucidate widely-seen misconceptions connected with via theoretical derivation instance analysis. Firstly, are often mistakenly regarded approximation same names when negligible. Secondly, insufficient unreasonable determine absorption-dominant performance case that higher than since cannot represent actual levels reflected absorbed power. Power coefficients recommended compare contribution performance. Thirdly, effect included definitions reflections property clarified against commonly wrong understandings. These clarifications offer correct comprehension mechanism assessment total shielding.

Language: Английский

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Multifunctional Ti3C2Tx-(Fe3O4/polyimide) composite films with Janus structure for outstanding electromagnetic interference shielding and superior visual thermal management

Nano Research, Journal Year: 2022, Volume and Issue: 15(6), P. 5601 - 5609

Published: April 18, 2022

Language: Английский

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High-Efficiency Electromagnetic Interference Shielding of rGO@FeNi/Epoxy Composites with Regular Honeycomb Structures

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

Published: Jan. 27, 2022

With the rapid development of fifth-generation mobile communication technology and wearable electronic devices, electromagnetic interference radiation pollution caused by waves have attracted worldwide attention. Therefore, design highly efficient EMI shielding materials are great importance. In this work, three-dimensional graphene oxide (GO) with regular honeycomb structure (GH) is firstly constructed sacrificial template freeze-drying methods. Then, amino functionalized FeNi alloy particles (f-FeNi) loaded on GH skeleton followed in-situ reduction to prepare rGH@FeNi aerogel. Finally, rGH@FeNi/epoxy composites obtained vacuum-assisted impregnation epoxy resin. Benefitting from construction synergistic effect, a low mass fraction 2.1 wt% (rGH f-FeNi 1.2 0.9 wt%, respectively) exhibit high effectiveness (EMI SE) 46 dB, which 5.8 times that (8 dB) for rGO/FeNi/epoxy same rGO/FeNi fraction. At time, also possess excellent thermal stability (heat-resistance index temperature at maximum decomposition rate 179.1 389.0 °C mechanical properties (storage modulus 8296.2 MPa).

Language: Английский

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A Perspective for Developing Polymer-Based Electromagnetic Interference Shielding Composites

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

Published: April 1, 2022

The rapid development of aerospace weapons and equipment, wireless base stations 5G communication technologies has put forward newer higher requirements for the comprehensive performances polymer-based electromagnetic interference (EMI) shielding composites. However, most currently prepared EMI composites are still difficult to combine high performance multi-functionality. In response this, based on research works relevant researchers as well our group, three possible directions break through above bottlenecks proposed, including construction efficient conductive networks, optimization multi-interfaces lightweight multifunction compatibility design. future trends in prospected, it is hoped provide certain theoretical basis technical guidance preparation,

Language: Английский

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Self-assembled MoS2/magnetic ferrite CuFe2O4 nanocomposite for high-efficiency microwave absorption

Chemical Engineering Journal, Journal Year: 2021, Volume and Issue: 429, P. 132253 - 132253

Published: Sept. 4, 2021

Language: Английский

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Electromagnetic interference shielding materials: recent progress, structure design, and future perspective

Journal of Materials Chemistry C, Journal Year: 2021, Volume and Issue: 10(1), P. 44 - 72

Published: Dec. 14, 2021

Novel structure design and shielding mechanism of various materials are critically reviewed. Measurement methods far-field near-field presented. Challenges future perspectives for discussed.

Language: Английский

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Morphology controllable urchin-shaped bimetallic nickel-cobalt oxide/carbon composites with enhanced electromagnetic wave absorption performance

Journal of Material Science and Technology, Journal Year: 2022, Volume and Issue: 148, P. 250 - 259

Published: Dec. 29, 2022

Language: Английский

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Carbon‐Based Radar Absorbing Materials toward Stealth Technologies

Advanced Science, Journal Year: 2023, Volume and Issue: 10(32)

Published: Sept. 21, 2023

Abstract Stealth technology is used to enhance the survival of military equipment in field surveillance, as it utilizes a combination techniques render itself undetectable by enemy radar systems. Radar absorbing materials (RAMs) are specialized reduce reflection (or absorption) signals provide stealth capability, which core component passive countermeasures applications. The properties RAMs can be optimized adjusting their composition, microstructure, and surface geometry. Carbon‐based present promising approach for fabrication ultrathin, versatile, high‐performance due large specific area, lightweight, excellent dielectric properties, high electrical conductivity, stability under harsh conditions. This review begins with brief history an introduction electromagnetic waves, systems, materials. followed discussion recent research progress carbon‐based RAMs, including carbon blacks, fibers, nanotubes, graphite, graphene, MXene, along in‐depth examination principles strategies on attenuation characteristics. Hope this will offer fresh perspectives design thereby fostering deeper fundamental understanding promoting practical

Language: Английский

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The art of framework construction: hollow-structured materials toward high-efficiency electromagnetic wave absorption

Advanced Composites and Hybrid Materials, Journal Year: 2022, Volume and Issue: 5(3), P. 1658 - 1698

Published: June 17, 2022

Language: Английский

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