Hierarchical Assembly of Ternary MOF‐Derived Sandwich Composites for High‐Efficiency Tunable Electromagnetic Wave Absorption

Small, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 31, 2024

Abstract The proliferation of electronic devices drives the adoption electromagnetic wave (EMW) absorbing materials to mitigate pollution. Metal‐organic frameworks (MOFs) reveal great potential in EMW absorption field due their unique pore structure and outstanding physicochemical properties. However, single MOFs are difficult achieve both efficient wide frequency coverage owing limited properties structural composition. Herein, a sandwich‐like ternary MOF composite is successfully synthesized through hierarchical assembly strategy. Following high‐temperature treatment, converted into nitrogen‐doped porous carbon with magnetic metals, non‐magnetic metal oxides, nanotubes on surface (labeled as TiO 2 /C@Co/N/C@CNT). sandwich resulting derivatives provides multi‐level microstructure multi‐component synergistic effects, significantly enhancing capabilities broadening effective bandwidth (EAB). At 1.8 mm matching thicknesses, material achieves reflection loss −56.3 dB 6.6 GHz EAB. Adjusting thicknesses 2.3 3.1 extends EAB 6.1–18 GHz, peaks −47.6 −47.1 dB. This work offers novel guidance for constructing advanced MOF‐derived ultra‐broadband strong meticulous design multiple components combination.

Language: Английский

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Absorption–Reflection–Transmission Power Coefficient Guiding Gradient Distribution of Magnetic MXene in Layered Composites for Electromagnetic Wave Absorption

Nano-Micro Letters, Journal Year: 2025, Volume and Issue: 17(1)

Published: Feb. 17, 2025

Abstract The morphological distribution of absorbent in composites is equally important with absorbents for the overall electromagnetic properties, but it often ignored. Herein, a comprehensive consideration including component regulation, layered arrangement structure, and gradient concentration was used to optimize impedance matching enhance loss. On microscale, incorporation magnetic Ni nanoparticles into MXene nanosheets (Ni@MXene) endows suitable intrinsic permittivity permeability. macroscale, Ni@MXene increases effective interaction area waves, inducing multiple reflection/scattering effects. this basis, according analysis absorption, reflection, transmission (A–R–T) power coefficients composites, constructed realize at low-concentration surface layer, loss middle interlayer microwave reflection high-concentration bottom layer. Consequently, composite (LG5-10–15) achieves complete absorption coverage X-band thickness 2.00–2.20 mm RL min −68.67 dB 9.85 GHz 2.05 mm, which 199.0%, 12.6%, 50.6% higher than non-layered, descending respectively. Therefore, work confirms importance structure improving performance broadens design high-performance materials.

Language: Английский

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Multifunctional Electromagnetic Responsive Porous Materials Synthesized by Freeze Casting: Principles, Progress, and Prospects

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 12, 2024

Abstract Freeze casting is a solidification technique utilized in the fabrication of porous materials. However, freeze process quite complex, and significant challenges remain precisely controlling pore size shape structures. This study aims to investigate customization multifunctional electromagnetic wave (EMW) absorbers with 3D structures via casting. review initially presents fundamental principles underlying examines correlation between internal external factors during preparation porosity. The emerging trends constructing novel intricate macroscopic through are subsequently outlined. Furthermore, this focuses on composites various microstructures low‐dimensional building blocks, their EMW response properties. By regulating influencing mechanisms casting, absorption materials exhibit outstanding advantages such as property manipulation, controllable structure, high porosity, specific surface area, lightweight, flexibility. These features broaden applications shielding, mechanical property, radar stealth, thermal insulation fire prevention, flexible sensors, antifreeze ability, etc. In addition, we discuss prospects high‐performance using techniques.

Language: Английский

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Enhancing strategies of MOFs-derived materials for microwave absorption: review and perspective

Advances in Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 338, P. 103412 - 103412

Published: Jan. 27, 2025

Language: Английский

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Heteroatom-doped hollow bimetallic carbon nanofibers induce polarization-dominated multiple loss mechanisms for microwave absorption

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 160683 - 160683

Published: Feb. 1, 2025

Language: Английский

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Facile Manufacturing of Ultralight TPU/PDA/CNT Nanofibers with Advanced Electromagnetic Wave Absorption

ACS Applied Electronic Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 20, 2025

Language: Английский

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Low-Frequency microwave absorption and favorable thermal conductivity in epoxy-based composite endowed by boron nitride@cobalt ferrite heterostructure fillers

Journal of Alloys and Compounds, Journal Year: 2025, Volume and Issue: unknown, P. 180373 - 180373

Published: April 1, 2025

Language: Английский

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Nanoconfinement Strategy for Lightweight Feconi/N-Doped Carbon Nanotubes with Broadband Electromagnetic Absorption

Published: Jan. 1, 2025

Language: Английский

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High efficiency electromagnetic waves absorption of ferrite/polypyrrole composite based on precise structural control of rare earth doping

Rare Metals, Journal Year: 2025, Volume and Issue: unknown

Published: April 26, 2025

Language: Английский

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Nanoconfinement Strategy for Lightweight FeCoNi/N-Doped Carbon Nanotubes with Broadband Electromagnetic Absorption

Materials Research Bulletin, Journal Year: 2025, Volume and Issue: unknown, P. 113548 - 113548

Published: May 1, 2025

Language: Английский

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