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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Hydrophobic Multilayered PEG@PAN/MXene/PVDF@SiO₂ Composite Film with Excellent Thermal Management and Electromagnetic Interference Shielding for Electronic Devices

Small, Journal Year: 2024, Volume and Issue: 20(46)

Published: Aug. 7, 2024

Abstract With the rapid development of electronic industry, it's pressing to develop multifunctional electromagnetic interference (EMI) shielding materials ensure stable operation devices. Herein, multilayered flexible PEG@PAN/MXene (Ti 3 C 2 T x )/PVDF@SiO (PMF) composite film has been constructed from level microstructure design via coaxial electrospinning, coating spraying, and uniaxial electrospinning strategies. Benefiting effective encapsulation for PEG high conductivity MXene coating, with loading density 0.70 mg cm −2 exhibits thermal energy storage 120.77 J g −1 great EMI performance (EMI SE 34.409 dB SSE 49.086 ) in X‐band (8–12 GHz). Therefore, this advanced can not only help devices prevent influence pollution but also play an important role device management. Additionally, deposition nano PVDF@SiO fibers (289 ± 128 nm) endowed PMF hydrophobic properties (water contact angle 126.5°) working hydrophilic thereby breaks limitation humid application environments. The finding paves a new way novel films

Language: Английский

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A review of how to improve Ti3C2Tx MXene stability

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 496, P. 154097 - 154097

Published: July 19, 2024

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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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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Multifunctional microwave absorption materials: construction strategies and functional applications

Materials Horizons, Journal Year: 2024, Volume and Issue: 11(23), P. 5874 - 5894

Published: Jan. 1, 2024

Classification and multifunctional scalability of advanced microwave absorbing materials.

Language: Английский

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Defect-rich carbon nanosheets derived from p(C3O2)x for electromagnetic wave absorption applications

Carbon, Journal Year: 2024, Volume and Issue: unknown, P. 119637 - 119637

Published: Sept. 1, 2024

Language: Английский

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Multiple Schottky Contacts Motivated via Defects to Tune the Response Ability of Electromagnetic Waves

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 5, 2025

Abstract Metal‐organic framework (MOF) derivatives employed as novel microwave‐absorbing materials (MAMs) have garnered significant attention due to their diverse in situ or ex coordinated components and the flexibility nano‐microstructure fabrication. A well‐designed heterointerface can provide an optimal balance between impedance high‐loss capability. However, precisely tuning semiconductor‐metal‐carbon heterostructures remains a huge challenge. Herein, multi‐component NiS/Co 3 S 4 /NiCo@CNTs/NC nanohybrid with hollow structure is elaborately fabricated using convenient solvothermal method followed by high‐temperature pyrolysis, forming unique heterostructure multiple Schottky contacts. This demonstrates remarkable reflection loss value of −75.9 dB at thickness 2.6 mm. The transcendent microwave absorption (MA) capacity primarily attributed intense polarization relaxation process superb impedance‐matching properties semiconductor/metal/carbon hybrid barriers. In addition, built‐in electric field established heterointerfaces increases electron transport capabilities. Notably, controllable introduction numerous defects into carbon layer intensifies interfacial effect nanohybrid. study offers innovative insights mechanisms development high‐performance MAMs.

Language: Английский

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Monolayer Interfacial Assembly toward Two‐Dimensional Mesoporous Heterostructure for Boosting Wave Absorption

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 12, 2025

Abstract Microwave absorption materials play a key role in various fields, including military stealth, human safety protection, and so on. Construction of 2D mesoporous heterostructures is an attractive approach to enhance wave‐absorbing ability, while it still great challenge. Herein, carbon‐MXene‐carbon (MCMCH) with channels parallel surface are successfully prepared via monolayer interfacial assembly strategy. Through the precise adjustment polymerization, cylindrical micelles orderly monolayered assemble on both surfaces MXene nanosheets, resulting switch‐like polydopamine‐MXene‐polydopamine MCMCH finally generated by further calcination. Due excellent dielectric polarization relaxation conductive loss, achieves strongest reflection loss −54.2 dB at thickness only 1.5 mm. The presence mesochannels not introduces air low permittivity for optimal impedance matching, but also extends attenuation path incident electromagnetic wave. maximum radar cross‐section reduction 26.9 m 2 achieved compared perfect electric conductor. This work provides reference engineering based microwave performance.

Language: Английский

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