Progress in microwave absorbing materials: A critical review

Advances in Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 327, P. 103143 - 103143

Published: April 4, 2024

Language: Английский

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Joule-Heating-Driven Synthesis of a Honeycomb-Like Porous Carbon Nanofiber/High Entropy Alloy Composite as an Ultralightweight Electromagnetic Wave Absorber

ACS Nano, Journal Year: 2024, Volume and Issue: 18(6), P. 5040 - 5050

Published: Jan. 29, 2024

High entropy alloys (HEA) have garnered significant attention in electromagnetic wave (EMW) absorption due to their efficient synergism among multiple components and tunable electronic structures. However, high density limited chemical stability hinder progress as lightweight absorbers. Incorporating HEA with carbon offers a promising solution, but synthesizing stable HEA/carbon composite faces challenges the propensity for phase separation during conventional heat treatments. Moreover, EMW mechanisms HEAs may be different from established empirical models high-entropy effect. This underscores urgent need synthesize absorbers uncover intrinsic mechanisms. Herein, we successfully integrated quinary FeCoNiCuMn into honeycomb-like porous nanofiber (HCNF) using electrostatic spinning Joule-heating method. Leveraging inherent lattice distortion effects honeycomb structure, HCNF/HEA demonstrates outstanding properties at an ultralow filler loading of 2 wt %. It achieves minimum reflection loss −65.8 dB boasts maximum bandwidth up 7.68 GHz. study not only showcases effectiveness combining HCNF HEA, also potential synthesis developing HEA-based

Language: Английский

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Defect Engineering Activates Schottky Heterointerfaces of Graphene/CoSe₂ Composites with Ultrathin and Lightweight Design Strategies to Boost Electromagnetic Wave Absorption

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(48)

Published: Sept. 8, 2023

Abstract To tackle the increasingly complex electromagnetic (EM) pollution environment, application‐oriented wave (EMW) absorption materials with ultra‐thin, light weight and strong tolerance to harsh environment are urgently explored. Although graphene aerogel‐based lightweight EMW absorbers have been developed, thinner thickness more effective polarization loss strategies still essential. Based on theory of transmission, this work innovatively proposes a high attenuation design strategy for obtaining ultra‐thin materials, cobalt selenide (CoSe 2 ) is determined as animportant part absorbers. In order obtain dielectric parameter range that satisfies characteristics improve properties composite CoSe modified N‐doped reduced oxide (N‐RGO/CoSe designed. Meanwhile, controllable introduction defect engineering into RGO can activate Schottky heterointerfaces composites generate interfacial effect, achieving while significantly improving EM capability. addition, infrared thermal images anti‐icing experiments show has good corrosion resistance, stealth, insulation properties. Therefore, provides an thin‐thickness, light‐weight, high‐performance embodying advantages N‐RGO/CoSe in practical applications.

Language: Английский

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In‐Situ Fabrication of Sustainable‐N‐Doped‐Carbon‐Nanotube‐Encapsulated CoNi Heterogenous Nanocomposites for High‐Efficiency Electromagnetic Wave Absorption

Small, Journal Year: 2023, Volume and Issue: 19(40)

Published: May 19, 2023

Developing carbon encapsulated magnetic composites with rational design of microstructure for achieving high-performance electromagnetic wave (EMW) absorption in a facile, sustainable, and energy-efficiency approach is highly demanded yet remains challenging. Here, type N-doped nanotube (CNT) CoNi alloy nanocomposites diverse heterostructures are synthesized via the sustainable autocatalytic pyrolysis porous CoNi-layered double hydroxide/melamine. Specifically, formation mechanism structure effects heterogenous composition on EMW performance ascertained. With presence melamine, emerges its autocatalysis effect to generate CNTs, leading unique heterostructure high oxidation stability. The abundant heterogeneous interfaces induce strong interfacial polarization EMWs optimize impedance matching characteristic. Combined inherent conductive loss capabilities, accomplish high-efficiency even at low filling ratio. minimum reflection -84.0 dB thickness 3.2 mm maximum effective bandwidth 4.3 GHz obtained, comparable best absorbers. Integrated controllable, preparation nanocomposites, work shows great promise nanocarbon encapsulation protocol lightweight, materials.

Language: Английский

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Pore-regulation in 2D biochar-based flakes towards wideband microwave absorption

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 464, P. 142568 - 142568

Published: March 31, 2023

Language: Английский

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