Zeolite imidazolate framework derived efficient absorbers: from morphology modulation to component regulation

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 1010, P. 177092 - 177092

Published: Oct. 16, 2024

Language: Английский

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Enhanced electromagnetic wave absorption of multicore Fe4N@N-doped porous carbon core-shell microspheres through dielectric-magnetic coordination

Carbon, Journal Year: 2025, Volume and Issue: unknown, P. 120176 - 120176

Published: Feb. 1, 2025

Language: Английский

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Anion Doping as a “Trigger” to Modulate Defect‐Tailored Dielectric Coupling for Ultrathin Microwave Absorber

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

Published: Dec. 1, 2024

Abstract Anion doping engineering is recognized as a prospective strategy to adjust the electronic configuration and transport capacity of carbon‐based magnetoelectric hybrids optimize defects for modulation electromagnetic (EM) properties. This study effectively accomplishes an overwhelming enhancement in dielectric coupling between conduction polarization CuCo bimetallic/carbon system by employing situ (N, O)/ex (S, Se) defect strategies. The well‐designed lattice distortions are facilitated large atomic radii (Se) intercalated carbon skeleton bimetallic CuCo, which activate reinforcement dipole high‐frequency region. Interestingly, appropriate number vacancies acts “electron traps” accelerate local charge redistribution, endowing with extremely strong interactions interface‐induced polarization. It remarkable that ultra‐thin feature (1.8 mm) able achieve extraordinary microwave attenuation (‒56.1 dB). Additionally, specific upgrading anionic Se beneficially hinders development phonon transmission, conferring Cu 2 Se/CoSe /NC‐Se aerogel outstanding infrared stealth capabilities along inheriting advantages traditional (lightness, compressive/structural stability, hydrophobicity/anti‐corrosive properties). research offers distinctive perspectives on advanced design multifunctional absorbers complex environments.

Language: Английский

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Heterointerface between Carbon Nano-Onions and Fluorinated Boron Nitride Nanostructures for Improved Microwave Absorption Properties

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

Published: Feb. 7, 2025

Carbon-based materials are considered to be promising candidates for lightweight microwave absorption (MAMs). However, single carbon-based cannot meet the requirements of wide effective bandwidth (EAB) and strong due missing magnetic loss. Combining with via rational design microstructures attends an way achieve high-performance absorption. In this study, core-shell carbon nano-onions@fluorinated boron nitrides (CNOs@F-BNNOs) nanocomposites N-C F-B bridging were obtained by a simple in situ pyrolytic polymerization as well hydrothermal fluorination strategy exhibited excellent properties. Furthermore, results indicate that addition F-BNNOs not only improves polarization loss optimizes impedance matching but also enhances effect, thereby improving electromagnetic wave performance (EWAP). Among these compositions, CNOs@F-BNNOs minimum reflection (RLmin) value -43.23 dB at 17.23 GHz, EAB 10.54 GHz thickness 2.80 mm. Additionally, have thermal conductivity. Therefore, work presents novel approach constructing lightweight, efficient,

Language: Английский

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Dual-Control strategy of structure and polarization for tunable electromagnetic wave absorption in the S-Ku band

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 161193 - 161193

Published: March 1, 2025

Language: Английский

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Preparation and electromagnetic property of Ag@FeSiAl/polyurethane resin flexible absorption wave coating

Journal of Alloys and Compounds, Journal Year: 2025, Volume and Issue: unknown, P. 179666 - 179666

Published: March 1, 2025

Language: Английский

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Magnetic micro-protrusion arrays with wrinkled polypyrrole surfaces for enhancing the performance of flexible pressure sensors

APL Materials, Journal Year: 2025, Volume and Issue: 13(1)

Published: Jan. 1, 2025

Flexible sensing technology has been developed and improved rapidly in recent years, attracting widespread attention research. Magnetic composites have great potential the field of flexible due to their excellent conductivity magnetic controllability. Here, a performance enhanced double-layer piezocapacitive sensor, PPy-SMPA, was proposed. The sensor consists substrate with surface micro-protrusion arrays formed by materials wrinkled PPy sensitive layer polymerized chemical deposition. internal micro-capacitance model at different pressures constructed, effects distribution degree particles aspect ratio on equivalent capacitance were discussed. exhibited cyclic stability, dynamic characteristics, mechanical durability, sensitivity reaching five times that planar low pressure range. On this basis, grip strength tests performed accelerate practical development, these sensors integrated into smart insoles for fall detection early warning, demonstrating applications wearable devices, homes, human health monitoring.

Language: Английский

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Synthesis of a Leaf-Like Co/C Nanosheet for Efficient Microwave Absorption

Langmuir, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 24, 2025

Elaborate engineering of the microstructure electromagnetic (EM) absorption materials affords infinite potential for achieving superior EM wave performance. In this work, a leaf-like Co/C nanosheet was rationally fabricated by facile pyrolysis CoZn-based zeolitic imidazolate framework-L (Co/Zn-ZIF-L) precursor. Herein, Co nanoparticles (NPs) are uniformly confined in porous carbon matrix, forming attractive heterostructures. A suitable 2D morphology and binary components endow composite with impedance matching synergetic losses excellent microwave radar stealth When filler content is as low 25 wt %, strong intensity −47.6 dB reached at thickness 2.1 mm, broad effective bandwidth 4.9 GHz achieved only 1.6 mm. At detection theta 0°, maximum cross-sectional (RCS) reduction value reaches 17.9 dB·m2. Hence, it expected that exhibits significant advantages field stealth, which paves way future exploration high-performance materials.

Language: Английский

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Controllable Interface and Defects in Carbon-Coated Flaky Carbonyl Iron via Laser Ablation for Multiband Microwave Absorption

Industrial & Engineering Chemistry Research, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 28, 2025

The increasing demands of fifth-generation (5G) communication technology and radar low-frequency detection systems for wave absorption, combined with the complexity variability practical applications, present significant challenges in achieving effective S-band multiband electromagnetic absorption materials. In this study, we flaky carbonyl iron (FCI) tunable surface defects carbon materials to fabricate heterogeneous interfaces defective shells via laser ablation technology, resulting development carbon-coated core–shell composites (FCI@C) properties. Compared FCI, FCIC1 sample, which was coated a single shell, exhibited best performance, realized triband (S, X, Ku-band) absorption. bandwidth (EAB) reaches 3.92 GHz (2.4–3.04 GHz, 8.4–10.08 15.68–17.28 GHz) at 8.7 mm. Density functional theory is used reveal enhancement shell on interface polarization Fe–C interface. exceptional performance attributed synergistic effects multiple loss mechanisms, arise from defect sites within shell. This work presents novel approach developing absorbing capable simultaneously meeting application requirements across different frequency bands.

Language: Английский

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Multiple heteroatom doped carbon nanocages with an open structure enabling superior electromagnetic wave absorption

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: unknown, P. 137498 - 137498

Published: April 1, 2025

Language: Английский

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