Surface engineering strategy for MXene to tailor electromagnetic wave absorption performance

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 491, P. 152041 - 152041

Published: May 7, 2024

Language: Английский

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Mixed-Dimensional Assembly Strategy to Construct Reduced Graphene Oxide/Carbon Foams Heterostructures for Microwave Absorption, Anti-Corrosion and Thermal Insulation

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

Published: June 17, 2024

Abstract Considering the serious electromagnetic wave (EMW) pollution problems and complex application condition, there is a pressing need to amalgamate multiple functionalities within single substance. However, effective integration of diverse functions into designed EMW absorption materials still faces huge challenges. Herein, reduced graphene oxide/carbon foams (RGO/CFs) with two-dimensional/three-dimensional (2D/3D) van der Waals (vdWs) heterostructures were meticulously engineered synthesized utilizing an efficient methodology involving freeze-drying, immersing absorption, secondary followed by carbonization treatment. Thanks their excellent linkage effect amplified dielectric loss optimized impedance matching, 2D/3D RGO/CFs vdWs demonstrated commendable performances, achieving broad bandwidth 6.2 GHz reflection − 50.58 dB low matching thicknesses. Furthermore, obtained also displayed significant radar stealth properties, good corrosion resistance performances as well outstanding thermal insulation capabilities, displaying great potential in variable environments. Accordingly, this work not only straightforward method for fabricating heterostructures, but outlined powerful mixed-dimensional assembly strategy engineering multifunctional protection, aerospace other conditions.

Language: Английский

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Kirkendall Effect‐Induced Ternary Heterointerfaces Engineering for High Polarization Loss MOF‐LDH‐MXene Absorbers

Small, Journal Year: 2024, Volume and Issue: 20(48)

Published: Aug. 29, 2024

Heterogeneous interfacial engineering has garnered widespread attention for optimizing polarization loss and enhancing the performance of electromagnetic wave absorption. A novel Kirkendall effect-assisted electrostatic self-assembly method is employed to construct a metal-organic framework (MOF, MIL-88A) decorated with Ni-Fe layered double hydroxide (LDH), forming multilayer nano-cage coated Ti

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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Enhancing electromagnetic wave absorption with core‐shell structured SiO₂@MXene@MoS₂ nanospheres

Carbon Energy, Journal Year: 2024, Volume and Issue: 6(8)

Published: Feb. 15, 2024

Abstract Material composition and structural design are important factors influencing the electromagnetic wave (EMW) absorption performance of materials. To alleviate impedance mismatch attributed to high dielectric constant Ti 3 C 2 T x MXene, we have successfully synthesized core‐shell structured SiO @MXene@MoS nanospheres. This architecture, comprising as core, MXene intermediate layer, MoS outer shell, is achieved through an electrostatic self‐assembly method combined with a hydrothermal process. complex structure not only provides variety loss mechanisms that effectively dissipate energy but also prevents self‐aggregation nanosheets. Notably, synergistic combination highly conductive enables suitable composites, ensuring optimal matching. Therefore, nanospheres exhibit excellent EMW performance, featuring remarkable minimum reflection (RL min ) −52.11 dB (2.4 mm). It noteworthy these achieve ultra‐wide effective bandwidth (EAB) 6.72 GHz. work novel approach for designing synthesizing high‐performance absorbers characterized by “wide strong loss.”

Language: Английский

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Porous Structure Fibers Based on Multi‐Element Heterogeneous Components for Optimized Electromagnetic Wave Absorption and Self‐Anticorrosion Performance

Small, Journal Year: 2024, Volume and Issue: 20(47)

Published: Aug. 11, 2024

Abstract The excellent performance of electromagnetic wave absorbers primarily depends on the coordination among components and rational design structure. In this study, a series porous fibers with carbon nanotubes uniformly distributed in shape pine leaves are prepared through electrospinning technique, one‐pot hydrothermal synthesis, high‐temperature catalysis method. impedance matching nanofibers structure is optimized by incorporating melamine into spinning solution, as it undergoes gas decomposition during calcination. Moreover, electronic can be modulated controlling NH 4 F content synthesis process. Ultimately, Ni/Co/CrN/CNTs‐CF specimen (P3C NiCrN12) exhibited superior performance, while achieving minimum reflection loss (RL min ) −56.18 dB at thickness 2.2 mm maximum absorption bandwidth (EAB max 5.76 GHz 2.1 mm. This study presents an innovative approach to fabricating lightweight, thin materials exceptional properties wide optimizing three key factors influencing performance.

Language: Английский

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Enhanced electromagnetic wave absorption and mechanical performances of graphite nanosheet/PVDF foams via ice dissolution and normal pressure drying

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(21), P. 7775 - 7783

Published: Jan. 1, 2024

An ice dissolution-normal pressure drying strategy based on graphite nanosheet was proposed to prepare porous PVDF foams, which own exceptional microwave absorption (RL max = −57.68 dB, EAB 6.86 GHz) and compression strength (300.9 kPa).

Language: Английский

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Synchronously Formed Hetero‐ and Hollow Core‐Branch Nanostructure Toward Wideband Electromagnetic Wave Absorption

Small, Journal Year: 2024, Volume and Issue: 20(48)

Published: Aug. 28, 2024

Abstract The intrinsic limitation of low electrical conductivity MoSe 2 resulted in inferior dielectric properties, which restricts its electromagnetic wave absorption (EMWA) performances. Herein, a bimetallic selenide /CoSe @N‐doped carbon (NC) composites with hollow core‐branch nanostructures are synthesized via the selenization treatment MoO 3 nanorods coated ZIF‐67. By adjusting mass ratio ZIF‐67 to , parameters and morphologies finely tuned, further ameliorating impedance matching EMWA involvement NC improves electronic composites. synchronously formed heterostructure not only facilitates charge transfer but also leads accumulation uneven distribution charges, thus enhancing conductive loss polarization loss. nanostructure provides abundant networks, heterointerfaces, voids, significantly property. Density functional theory implies that heterostructures effectively boost transport change distribution, heightens As result, demonstrate minimum reflection value −53.53 dB at 9.04 GHz, alongside maximum effective bandwidth 6.32 GHz. This work offers invaluable insights into novel structural designs for future research applications.

Language: Английский

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Construction of three-dimensional porous network Fe-rGO aerogels with monocrystal magnetic Fe3O4@C core-shell structure nanospheres for enhanced microwave absorption

Materials Today Physics, Journal Year: 2024, Volume and Issue: 42, P. 101383 - 101383

Published: March 1, 2024

Language: Английский

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N atoms regulate heterogeneous crystal phase engineering of mesoporous magnetic FexN nanofibers to promote electromagnetic wave dissipation of magnetic composite aerogel absorbers

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 481, P. 148584 - 148584

Published: Jan. 7, 2024

Language: Английский

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