Molecular Intercalation‐Induced Two‐Phase Evolution Engineering of 1T and 2H‐MS₂ (M = Mo, V, W) for Interface‐Polarization‐Enhanced Electromagnetic Absorbers

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

Published: May 10, 2024

Abstract Polarization at interfaces is an important loss mechanism for electromagnetic wave (EMW) attenuation, though the motion behavior of carriers in composed different types conductors has yet to be investigated. Tuning phase structure transition metal dichalcogenides (TMDs) MS 2 (M = Mo, V, W) by organics small molecule intercalation achieve modulation interfacial effective strategy, where 1T‐MS exhibits metallic properties and 2H‐MS semiconducting properties. To exclude contribution intrinsic TMDs materials, three (MoS , VS WS ), which also possess transitions, are Among them, composite excellent EMW absorption performance under synergistic effect polarization conduction loss. 1T‐MoS /MOF‐A best with RL min −61.07 dB a thickness 3.0 mm EAB 7.2 GHz 2.3 mm. The effectiveness using 1T‐phase 2H‐phase demonstrated, analysis carrier during

Language: Английский

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Achieving Ultra-Broad Microwave Absorption Bandwidth Around Millimeter-Wave Atmospheric Window Through an Intentional Manipulation on Multi-Magnetic Resonance Behavior

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 16(1)

Published: April 22, 2024

Abstract The utilization of electromagnetic waves is rapidly advancing into the millimeter-wave frequency range, posing increasingly severe challenges in terms pollution prevention and radar stealth. However, existing absorbers are still inadequate addressing these issues due to their monotonous magnetic resonance pattern. In this work, rare-earth La 3+ non-magnetic Zr 4+ ions simultaneously incorporated M-type barium ferrite (BaM) intentionally manipulate multi-magnetic behavior. By leveraging contrary impact on magnetocrystalline anisotropy field, restrictive relationship between intensity successfully eliminated. peak-differentiating imitating results confirm that significant phenomenon emerges around 35 GHz reinforced exchange coupling effect Fe 2+ ions. Additionally, Mössbauer spectra analysis, first-principle calculations, least square fitting collectively identify additional doping leads a profound rearrangement occupation thus makes portion polarization/conduction loss increase gradually. As consequence, –Zr co-doped BaM achieves an ultra-broad bandwidth 12.5 + covering from 27.5 40 GHz, which holds remarkable potential for atmospheric window GHz.

Language: Английский

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Defect design and vacancy engineering of NiCo2Se4 spinel composite for excellent electromagnetic wave absorption

Ceramics International, Journal Year: 2024, Volume and Issue: 50(22), P. 46643 - 46652

Published: Sept. 3, 2024

Language: Английский

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Manipulating cellulose-based dual-network coordination for enhanced electromagnetic wave absorption in magnetic porous carbon nanocomposites

Composites Communications, Journal Year: 2024, Volume and Issue: 48, P. 101922 - 101922

Published: April 30, 2024

Language: Английский

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Modulating magnetic interface layer on porous carbon heterostructures for efficient microwave absorption

Nano Research, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 3, 2024

Language: Английский

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Customized heterostructure of transition metal carbides as high-efficiency and anti-corrosion electromagnetic absorbers

Carbon, Journal Year: 2024, Volume and Issue: 228, P. 119323 - 119323

Published: June 8, 2024

Language: Английский

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Multifunctional electromagnetic wave absorbing carbon fiber/Ti3C2TX MXene fabric with superior near-infrared laser dependent photothermal antibacterial behaviors

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 676, P. 217 - 226

Published: July 14, 2024

Language: Английский

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Optimizing Integrated‐Loss Capacities via Asymmetric Electronic Environments for Highly Efficient Electromagnetic Wave Absorption

Small, Journal Year: 2024, Volume and Issue: 20(43)

Published: July 2, 2024

Asymmetric electronic environments based on microscopic-scale perspective have injected infinite vitality in understanding the intrinsic mechanism of polarization loss for electromagnetic (EM) wave absorption, but still exists a significant challenge. Herein, Zn single-atoms (SAs), structural defects, and Co nanoclusters are simultaneously implanted into bimetallic metal-organic framework derivatives via two-step dual coordination-pyrolysis process. Theoretical simulations experimental results reveal that coupling interactions between SAs defects delocalize symmetric generate additional dipole without sacrificing conduction owing to compensation carbon nanotubes. Moreover, with large nanocurvatures induce strong interfacial electric field, activate superiority heterointerfaces promote polarization. Benefiting from aforementioned merits, resultant deliver an optimal reflection -58.9 dB effective absorption bandwidth is 5.2 GHz. These findings provide innovative insight clarifying microscopic asymmetric electron viewpoint inspire generalized modulation engineering optimizing EM absorption.

Language: Английский

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Robust Solid–Solid Phase Change Coating Encapsulated Glass Fiber Fabric with Electromagnetic Interference Shielding for Thermal Management and Message Encryption

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

Published: Sept. 9, 2024

Abstract Electromagnetic interference (EMI) shielding composites with both thermal response/management functions and message transfer/encryption behavior are ideal for use in fields such as aerospace, construction engineering, military equipment. In this work, a self‐cross‐linking supramolecular solid–solid phase change polyethylene glycol (ScPEG) coating is prepared based on multiple hydrogen bonds, which used encapsulating glass fiber fabric (GFF) modified silver nanowires (AgNWs). The obtained through the hydrolysis‐condensation of PEG reactive silanol end group. Polyethylene molecular chains can store release heat by switching between crystalline amorphous state. groups form networks physical cross‐linking resulting an excellent stability. particular, bonds ScPEG AgNW‐modified GFF (A‐GFF) enhance interfacial interactions, robust structure enables efficient stress transfer. ScPEG‐coated A‐GFF achieve tensile strength up to 191 MPa tunable EMI effectiveness (SE) 40 72 dB depending number layers. Moreover, exhibits flexible response characteristic, outstanding management capability, potential encryption behavior.

Language: Английский

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Interface Engineering of Titanium Nitride Nanotube Composites for Excellent Microwave Absorption at Elevated Temperature

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 16(1)

Published: April 4, 2024

Abstract Currently, the microwave absorbers usually suffer dreadful electromagnetic wave absorption (EMWA) performance damping at elevated temperature due to impedance mismatching induced by increased conduction loss. Consequently, development of high-performance EMWA materials with good matching and strong loss ability in wide spectrum has emerged as a top priority. Herein, high melting point, electrical conductivity, excellent environmental stability, EM coupling effect, abundant interfaces titanium nitride (TiN) nanotubes, they were designed based on controlling kinetic diffusion procedure Ostwald ripening process. Benefiting from boosted heterogeneous between TiN nanotubes polydimethylsiloxane (PDMS), enhanced polarization relaxations created, which could not only improve depletion efficiency EMWA, but also contribute optimized temperature. Therefore, nanotubes/PDMS composite showed performances varied (298–573 K), while achieved an effective bandwidth (EAB) value 3.23 GHz minimum reflection (RL min ) − 44.15 dB 423 K. This study clarifies relationship dielectric capacity (conduction loss) temperature, breaks new ground for interface engineering.

Language: Английский

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