Hierarchical porous molybdenum carbide synergic morphological engineering towards broad multi-band tunable microwave absorption

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

Published: Sept. 12, 2024

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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Designing Electronic Structures of Multiscale Helical Converters for Tailored Ultrabroad Electromagnetic Absorption

Nano-Micro Letters, Journal Year: 2024, Volume and Issue: 17(1)

Published: Sept. 26, 2024

Abstract Atomic-scale doping strategies and structure design play pivotal roles in tailoring the electronic physicochemical property of electromagnetic wave absorption (EMWA) materials. However, relationship between configuration (EM) loss mechanism has remained elusive. Herein, drawing inspiration from DNA transcription process, we report successful synthesis novel situ Mn/N co-doped helical carbon nanotubes with ultrabroad EMWA capability. Theoretical calculation EM simulation confirm that orbital coupling spin polarization Mn–N 4 –C configuration, along cross generated by structure, endow converters enhanced loss. As a result, HMC-8 demonstrates outstanding performance, achieving minimum reflection −63.13 dB at an ultralow thickness 1.29 mm. Through precise tuning graphite domain size, HMC-7 achieves effective bandwidth (EAB) 6.08 GHz 2.02 mm thickness. Furthermore, constructing macroscale gradient metamaterials enables ultrabroadband EAB 12.16 only 5.00 mm, maximum radar section reduction value reaching 36.4 m 2 . This innovative approach not advances understanding metal–nonmetal co-doping but also realizes broadband EMWA, thus contributing to development mechanisms applications.

Language: Английский

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Fluid-Actuated Nano–Micro–Macro Structure Morphing Enables Smart Multispectrum Compatible Stealth

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

Published: Dec. 19, 2024

Modern detection technology has driven camouflage toward multispectral compatibility and dynamic regulation. However, developing such stealth technologies is challenging due to different frequency-band principles. Here, this work proposes a design concept for fluid-actuated compatible smart device that employs deformable mechanochromic layer/elastomer with channeled dielectric layer. After fluid actuation, the elastomer layer transmits mechanical strain layer, thereby altering visible reflectance wavelengths in [568, 699] nm. Concurrently, pumped-in liquid reconfigures spatial structure parameter alter microwave resonance diffraction radar absorption, enabling absorption significant broadband at [8.16, 18.0] GHz. Using heat-absorption property also achieves infrared stealth, shown by ΔT ≈ 16.5 °C temperature difference. Additionally, exhibits rapid response time (∼1 s), excellent cycling performance (100 cycles), programmability (10 codes), offering new strategy.

Language: Английский

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Preparation of cellulose derived carbon/reduced graphene oxide composite aerogels for broadband and efficient microwave dissipation

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 675, P. 401 - 410

Published: July 5, 2024

Language: Английский

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Tuning the Multilevel Hierarchical Microarchitecture of MXene/rGO‐Based Aerogels Through a Magnetic Field‐Guided Strategy Toward Stepwise Enhanced Electromagnetic Wave Dissipation

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

Published: June 5, 2024

Abstract Hierarchical microarchitecture engineering is a state‐of‐the‐art approach to designing aerogel electromagnetic (EM) wave absorbers, offering huge potential in improving EM energy dissipation. However, the intrinsic feedback mechanism regarding specific influence of each parameter on properties not comprehensively revealed, making it challenging fully utilize aerogels achieve superior absorption performance. Herein, range MXene/rGO‐based with multilevel hierarchical configurations are fabricated by magnetic field‐guided strategy. Leveraging growth thermodynamics effects under field and bridging effect between adjacent rGO units, three models (lamellae ordering, interlayer spacing, layer thickness) constructed aerogels. Remarkably, progressively improve reflection loss ( RL ), effective bandwidth (EAB), matching thickness enhancing dielectric loss, decoupling attenuation‐impedance matching, adjusting power density, respectively. Consequently, exhibit stepwise enhancement performance, achieving −64.6 dB broad EAB 7.0 GHz at 1.8 mm thickness, surpassing alternative other configurations. This work elucidates synergistic multi‐effect dissipation waves aerogels, providing insights for advanced absorbers through diverse strategies.

Language: Английский

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Hollow-magnetite/MXene nanohybrids with unique coral-like structure for electromagnetic wave absorption

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 999, P. 175034 - 175034

Published: May 31, 2024

Language: Английский

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Fabrication of core–shell nickel ferrite@polypyrrole composite for broadband and efficient electromagnetic wave absorption

Composites Part A Applied Science and Manufacturing, Journal Year: 2024, Volume and Issue: 188, P. 108558 - 108558

Published: Oct. 28, 2024

Language: Английский

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Carbon nanolayer-mounted single metal sites enable dipole polarization loss under electromagnetic field

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: Oct. 21, 2024

Surface modulation strategies have spurred great interest with regard to regulating the morphology, dispersion and flexible processability of materials. Unsurprisingly, customized surfaces is primed offer a route control their electronic functions. To regulate electromagnetic wave (EMW) absorption applications by surface engineering an unmet challenge. Thanks pyrolyzing surface-anchored metal-porphyrin, here we report on four-nitrogen atoms-confined single metal site nitrogen-doped carbon layer (sM(N4)@NC, M = Ni, Co, Cu, Ni/Cu) (sM=single metal; NC= layer) that registers absorption. Surface-anchored metal-porphyrins are afforded attaching them onto polypyrrole via prototypical click reaction. Further, sM(N4)@NC experimentally found elicit identical dipole polarization loss mechanism, overcoming handicaps conductivity loss, defects, interfacial among current EMW absorber models. Importantly, exhibit effective bandwidth 6.44 reflection −51.7 dB, preceding state-of-the-art carbon-based absorbers. This study introduces strategy design absorbers based sites enable fine-tunable controlled mechanism atomistic precision. In this work, Cheng et al. unique dipole-dominated model excluding other redundant opening avenue for exploring future academic studies industrially applicable absorbing

Language: Английский

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Plasma Engineering toward Improving the Microwave-Absorbing/Shielding Feature of a Biomass-Derived Material

Langmuir, Journal Year: 2024, Volume and Issue: 40(23), P. 12148 - 12158

Published: May 28, 2024

During the past decade, ever-increasing electromagnetic pollution has excited a global concern. A sustainable resource, facile experimental scenario, fascinating reflection loss (RL), and broad efficient bandwidth are substantial factors that intrigue researchers. This research led to achievement of brilliant microwave-absorbing material by treating pampas as biomass. The carbon-based microfibers attained biowaste were treated plasma under diverse environments amplify their features. Moreover, pyrolysis scenario was performed compare results. reductive processes H2 carbonization. However, CO2 regulate heteroatoms defects. Interestingly, polystyrene (PS) applied matrix. aromatic rings existing in absorbing medium establish electrostatic interactions, elevating interfacial polarization, physical characteristics PS augment practical applications final product. manipulated biomasses characterized Raman, X-ray diffraction, energy-dispersive spectroscopy, field emission scanning electron microscopy, diffuse spectroscopy analyses. Eventually, features estimated vector network analyzer. plasma-treated H2/Ar blended with gained maximum RL −90.65 dB at 8.79 GHz an (RL ≤ −10 dB) 4.24 thickness 3.20 mm; meanwhile, treatment 97.99 14.92 7.74 2.05 mm thickness. Particularly, biomass plasmolyzed Ar covered entire X Ku bands 2.10 mm. Notably, total shielding efficiencies bioinspired materials up ≈99%, desirable for applications.

Language: Английский

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