Interfacial Polarization Loss Improvement Induced by the Hollow Engineering of Necklace‐like PAN/Carbon Nanofibers for Boosted Microwave Absorption

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

Published: Feb. 28, 2024

Abstract Rational manipulation of composition and microstructure design is recognized as an effective pathway to realize multifunctional high‐performance microwave absorber. In this work, necklace‐like hollow polyacrylonitrile (PAN)/carbon nanofibers are designed constructed through a simple continuous electrospinning‐carbonization‐etching route. Specifically, by varying the carbonization temperature, ratio PAN carbon content PAN/carbon can be effectively regulated, resulting in tunable electromagnetic parameters conductive loss capacities. After that, structure further introduced improve feature lightweight, impedance‐matching characteristics, interfacial polarization ability. Accordingly, exhibited frequency bandwidth 6.60 GHz minimum reflection −44.73 dB at 1.76 mm. Both experimental theoretical simulation results indicated that obtained possessed high chemical stability excellent absorbing performance, endowing them candidates for absorbers extreme conditions. Therefore, findings not only offered rationally manipulate but also provided novel technique make most engineering strengthening interface loss.

Language: Английский

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Impact mechanisms of aggregation state regulation strategies on the microwave absorption properties of flexible polyaniline

Journal of Colloid and Interface Science, Journal Year: 2023, Volume and Issue: 651, P. 494 - 503

Published: Aug. 7, 2023

Language: Английский

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Tailoring Built‐In Electric Field in a Self‐Assembled Zeolitic Imidazolate Framework/MXene Nanocomposites for Microwave Absorption

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(19)

Published: Jan. 30, 2024

Abstract Heterointerface engineering, which plays a pivotal role in developing advanced microwave‐absorbing materials, is employed to design zeolitic imidazolate framework (ZIF)–MXene nanocomposites. The ZIF–MXene composites are prepared by electrostatic self‐assembly of negatively charged titanium carbide MXene flakes and positively Co‐containing ZIF nanomaterials. This approach effectively creates abundant Mott–Schottky heterointerfaces exhibiting robust built‐in electric field (BIEF) effect, as evidenced experimental theoretical analyses, leading notable attenuation electromagnetic energy. Systematic manipulation the BIEF‐exhibiting heterointerface, achieved through topological modulation ZIF, proficiently alters charge separation, facilitates electron migration, ultimately enhances polarization relaxation loss, resulting exceptional wave absorption performance (reflection loss RL min = −47.35 dB effective bandwidth f E 6.32 GHz). present study demonstrates an innovative model system for elucidating interfacial mechanisms pioneers novel functional materials with characteristics spatial engineering.

Language: Английский

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In Situ Atomic Reconstruction Engineering Modulating Graphene-Like MXene-Based Multifunctional Electromagnetic Devices Covering Multi-Spectrum

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

Published: April 15, 2024

With the diversified development of big data, detection and precision guidance technologies, electromagnetic (EM) functional materials devices serving multiple spectrums have become a hot topic. Exploring multispectral response is challenging meaningful scientific question. In this study, MXene/TiO

Language: Английский

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Constructing Built-In Electric Fields with Semiconductor Junctions and Schottky Junctions Based on Mo–MXene/Mo–Metal Sulfides for Electromagnetic Response

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

Published: June 11, 2024

Abstract The exploration of novel multivariate heterostructures has emerged as a pivotal strategy for developing high-performance electromagnetic wave (EMW) absorption materials. However, the loss mechanism in traditional is relatively simple, guided by empirical observations, and not monotonous. In this work, we presented semiconductor–semiconductor–metal heterostructure system, Mo–MXene/Mo–metal sulfides (metal = Sn, Fe, Mn, Co, Ni, Zn, Cu), including semiconductor junctions Mott–Schottky junctions. By skillfully combining these distinct functional components (Mo–MXene, MoS 2 , metal sulfides), can engineer multiple heterogeneous interface with superior capabilities, broad effective bandwidths, ultrathin matching thickness. successful establishment gives rise to built-in electric field that intensifies electron transfer, confirmed density theory, which collaborates dielectric polarization mechanisms substantially amplify EMW absorption. We detailed synthesis series featuring both semiconductor–semiconductor semiconductor–metal interfaces. achievements were most pronounced Mo–MXene/Mo–Sn sulfide, achieved remarkable reflection values − 70.6 dB at thickness only 1.885 mm. Radar cross-section calculations indicate MXene/Mo–metal have tremendous potential practical military stealth technology. This work marks departure from conventional component design limitations presents pathway creation advanced MXene-based composites potent capabilities.

Language: Английский

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Heterogeneous Interface Engineering of Bi‐Metal MOFs‐derived ZnFe₂O₄–ZnO‐Fe@C Microspheres via Confined Growth Strategy Toward Superior Electromagnetic Wave Absorption

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 34(3)

Published: Oct. 9, 2023

Abstract Heterogeneous interface regulation plays an important role in tailoring the intrinsic electromagnetic (EM) properties for obtaining excellent EM wave absorption, which still faces huge challenge. In this work, bi‐metal MOFs‐derived ZnFe 2 O 4 –ZnO‐Fe@C (ZZFC) microspheres with custom‐built heterogeneous interfaces are successfully fabricated via a confined growth strategy. Bi‐metal Fe–Zn–ZIF tailored coordination structure and chemical bonding first selected as precursor template. After undergoing annealing process, metal Fe 2+ host is converted into magnetic nanoparticles (NPs). The Zn transformed semiconductor zinc oxide (ZnO) increasing (101) crystal‐oriented growth. At same time, hosts further reacted to synthesize ferrite (ZnFe ). Formed catalyze organic ligands constitute graphitized carbon layers, confine of , ZnO, NPs. Combined well impendence synergy absorption mechanism (magnetic loss, polarization, conduction loss), optimized magnetic–dielectric exhibit outstanding minimum reflection loss −66.5 dB at only 2.0 mm thickness. MOF‐derived materials provide new sight design efficient system.

Language: Английский

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Improving electromagnetic wave absorption property of metal borides/carbon nanocomposites by magnetic-electric balance and ion substitution tuning strategy

Carbon, Journal Year: 2024, Volume and Issue: 221, P. 118901 - 118901

Published: Feb. 9, 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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Conjugate ferrocene polymer derived magnetic Fe/C nanocomposites for electromagnetic absorption application

Journal of Material Science and Technology, Journal Year: 2023, Volume and Issue: 175, P. 125 - 131

Published: Sept. 9, 2023

Language: Английский

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Multifunctional MoC_x Hybrid Polyimide Aerogel with Modified Porous Defect Engineering for Highly Efficient Electromagnetic Wave Absorption

Small, Journal Year: 2024, Volume and Issue: 20(31)

Published: March 7, 2024

Abstract Traditional electromagnetic absorbing materials (EWAMs) are usually single functions and can easily affect their performance in diverse application scenarios. Effective integration of EWAMs into multiple function components is a valuable strategy to achieve maximum absorption multifunction while maintaining indispensable physical chemical properties. In this work, the polyoxometalates (POMs) serving as “guests” embedded within Co‐MOFs construct 3d/4d‐bimetallic based crystalline precursors dielectric/magnetic synergistic system. The proper pyrolysis temperature induced homogeneously distributed metallic Co MoC x hetero‐units carbon matrix with modified porous defect engineering enhance wave (EW). Owing brilliant effect polarization, magnetic loss, impedance matching, superior RL min −47.72 dB at 11.76 GHz thickness 2.0 mm wide adequate bandwidth (EAB) 4.58 (7.44–12.02 GHz) covered whole X‐band 2.5 for η ‐MoC/Co@NC‐800 observed. More importantly, resulting hybrid polyimide (MCP) aerogel exhibits desirable properties such structural robustness, nonflammability, excellent thermal insulation, self‐cleaning capabilities that comparable those commercially available products. This work offers inspiration creating multipurpose microwave absorbers intricate designs.

Language: Английский

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