A Pomegranate‐Like Nanolayer Featuring A Core‐Shell Architectural Design for Thermal‐Mechanical‐Electromagnetic Responses and Sensor

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

Published: Dec. 12, 2024

Abstract Multifunctional electromagnetic wave (EMW) absorbing materials are attracting attention because of their potential applications in medical, livelihood, and military. In this study, a pomegranate‐like nanolayer featuring core‐shell architecture (PNCS) is prepared using confinement strategy. Introducing metal atoms into unique design (M‐PNCS, M = Mn, Fe, Co, Ni, Cu) effectively tuned the response improved functions. The Mn‐PNCS composite exhibited highest absorption. Its reflection loss ( RL ) reached −62.39 dB with an effective absorption bandwidth (EAB) at 1.8 mm 6.0 GHz. As charge transport capacity increases, its can be transformed shielding, green shielding index up to 3.54. On basis, used fabricate multifunctional film new strain sensor. This integrated absorption, thermal insulation, hydrophobicity, flexibility, sensing, thus showing for use wearable protective clothing. addition, sensors simulation achieved sensing through coupling effect between patterns. These findings demonstrate that excellent material technical fields EMW devices.

Language: Английский

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High-Performance Thermoelectric Composite of Bi₂Te₃ Nanosheets and Carbon Aerogel for Harvesting of Environmental Electromagnetic Energy

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 4, 2025

Intensifying the severity of electromagnetic (EM) pollution in environment represents a significant threat to human health and results considerable energy wastage. Here, we provide strategy for electricity generation from heat generated by wave radiation captured surrounding that can reduce level while alleviating crisis. We prepared porous, elastomeric, lightweight Bi

Language: Английский

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Advancements in 2D Titanium Carbide (MXene) for Electromagnetic Wave Absorption: Mechanisms, Methods, Enhancements, and Applications

Small Methods, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 28, 2025

Abstract With the advent of 5G era, there has been a marked increase in research interest concerning electromagnetic wave‐absorbing materials. A critical challenge remains improving properties these materials while satisfying diverse application demands. MXenes, identified as prominent “emerging” 2D for wave absorption, offer unique advantages that are expected to drive advancements and innovations this field. This review emphasizes synthesis benefits provided by structural characteristics MXenes performance enhancements achieved through their combination with other absorbing Material requirements, approaches, conceptual frameworks integrated underscore advantages. The study provides thorough analysis MXene‐absorbing composites, going beyond basic classification address preparation modification processes affecting absorption composites. Attention is directed techniques, design principles, influence on composite performance. Additionally, potential applications devices summarized. concludes addressing challenges currently confronting MXene outlining developmental trends, aiming guidance subsequent domain.

Language: Английский

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Top‐Level Electromagnetic Design of Multishell Resonant Cavity for Microspherical Microwave Structural Absorbers

Small Structures, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 11, 2025

In response to the increasing need for high‐performance microwave absorption materials (MAMs), this study introduces a multiaxis electrospinning method synthesizing graphene‐based aerogel microspheres (GAMs) aimed at broadband (MA). The micro/nanostructures and shell configurations of GAMs are effectively regulated controlled establish predictable structure‐properties relationship via establishing equivalent electromagnetic (EM) models. computational simulations results structure–property employed as guidance evaluate effects structural features, like hollow structures multilayered shells. analysis reveals that enhancing cavity optimizes impedance matching promotes MA performance. Utilizing these insights, fabricated (HGAMs) achieve an effective bandwidth (EAB) 8.1 GHz optimal reflection loss −34.8 dB 3.3 mm thickness. Further involving various hierarchical arranged into mono/bilayer arrays investigate group coupling on performance through synergistically absorptive, interferential, resonant attenuation mechanisms. Actual examination using arch HGAM bilayer confirms simulations, achieving EAB 15 thickness 7 mm. Consequently, approach demonstrates promising avenue developing lightweight, nanostructured MAMs suitable advanced applications.

Language: Английский

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Two birds with one stone: Integrating multidimensional heterointerfaces with abundant nitrogen sites for ultrathin broadband microwave absorber

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 161603 - 161603

Published: March 1, 2025

Language: Английский

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High‐Density Dual Atoms Pairs Coupling for Efficient Electromagnetic Wave Absorbers

Small, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 27, 2024

Abstract Dual atoms (DAs), characterized by flexible structural tunability and high atomic utilization, hold significant promise for atom‐level coordination engineering. However, the rational design with high‐density heterogeneous DAs pairs to promote electromagnetic wave (EMW) absorption performance remains a challenge. In this study, Ni─Cu coupled absorbers are precisely constructed on nitrogen‐rich carbon substrate, achieving an impressive metal loading amount of 4.74 wt.%, enabling huge enhancement effective bandwidth (EAB) EMW from 0 7.8 GHz. Furthermore, minimum reflection loss (RL min ) is −70.96 dB at matching thickness 3.60 mm, corresponding >99.99% incident energy. Both experimental results theoretical calculations indicate that synergistic effect sites in transfer electron‐rich initial N Cu sites, which induces strong asymmetric polarization redistribution local charge significantly improves performance. This work not only provides strategy preparation DA but also demonstrates role tuning symmetry level.

Language: Английский

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Phase Engineering in a Twin‐Phase β/γ‐MoC_x Lightweight Nanoflower with Matched Fermi Level for Enhancing Electron Transport Across the Polarized Interfaces in Electromagnetic Wave Attenuation

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

Published: Sept. 19, 2024

Abstract The phase engineering of the polarization interface is great significance in modifying dielectric loss electromagnetic wave (EMW) attenuation process, but hard to conduct a complex hybrid system. Herein, twin‐phase β/γ‐MoC x @CN with matched Fermi level and closed work function properties lightweight MoC nanoflower constructed, facilitating electron transport withdraw enhanced conductivity polarization. Moreover, EMW multiple dissipations among promoted, displaying better impedance. It delivered remarkable minimum reflection (RL min ) −74.2 dB at thickness 1.5 mm, which far beyond single phased β‐MoC @CN, γ‐MoC reported ‐based absorbers. radar cross‐section (RCS) map simulated, showing brilliant maximum reduction value 13.6 m 2 theta angle 30°. This presented an excellent sample atomic‐level manipulation interfacial absorption materials.

Language: Английский

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Enhanced Interfacial Polarization Loss of FeS/MoS₂@N‐Doped Carbon Sandwich‐Walled Nanotubes Enables High‐Performance Electromagnetic Wave Absorption

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

Published: Feb. 3, 2025

Abstract Multiple interfaces and hollow structures are vital to high‐performance electromagnetic wave (EMW) absorption of absorbers. However, it remains difficult construct tune such structures, there is limited understanding regarding the relationships between their structural dielectric loss properties. Herein, theoretical simulations for EMW performance sandwich solid double‐layer first carried out found that former exhibits a more pronounced power density than latter. Then, ligand‐exchange strategy following vulcanization process fabricate FeS/MoS 2 @N‐doped carbon sandwich‐walled nanotubes (FeMoS‐SWCNTs) dveloped. The experimental results demonstrate FeMoS‐SWCNTs show significantly enhanced compared FeS counterparts, consistent with simulation results. Further functional theory calculations reveal properties attributed stronger interfacial polarization resulting from electronic interactions at multiple (FeS/N‐doped (NC), MoS /NC, ), conduction caused by higher states in heterostructure. These findings elucidate relationship nanotube properties, developed method offers feasible approach rational design applications.

Language: Английский

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Enhanced Dielectric Loss via Six‐Coordinated Er Single Atoms on Porous Carbon Nanofibers for High‐Performance Electromagnetic Wave Absorption

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

Published: March 10, 2025

Abstract The metal single‐atoms (M‐SAs) have shown enhanced electromagnetic wave absorption performances. However, the relationship between their coordination number with non‐metal atoms and property is still blurry. Here, erbium (Er‐SAs) coordinated six nitrogen on one‐dimensional (1D) nitrogen‐doped hollow carbon nanofibers (HCNF‐Er) are presented for high‐performance absorption. Density functional theory (DFT) calculations experimental results reveal that Er─N 6 configuration D h symmetry significantly enhances both conduction polarization losses of HCNF support, outperforming four‐coordinated M‐SAs 4 symmetry. It also found abundant porosity increases surface area, optimizing impedance matching enhancing lightweight HCNF‐Er. Consequently, HCNF‐Er‐based film shows a wide effective bandwidth (EAB) 6.0 GHz. Furthermore, exhibits excellent flexibility, thermal insulation, mechanical strength. This study offers comprehensive optimization configurations absorption, emphasizing its potential scalable applications.

Language: Английский

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Design of Gel‐Based Materials for Electromagnetic Wave Absorption

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

Published: March 20, 2025

Abstract Over the past 20 years, there is a shift of research and development in electromagnetic wave (EMW) absorption materials toward exploiting unique structure composition gel‐based based to manipulate EMWs. In this article, it will review by focusing on applications various gels for EMW absorption, including aerogels, hydrogels, xerogels, organic gels, as well ionogels. This study highlights some new mechanistic insights design strategies dielectric loss, magnetic electro‐magnetic loss absorbers. For an in‐depth understanding into these recent areas, discuss historic perspectives absorption. Especially, emphasizes advantages multifunctional Finally, pending current challenges prospects performance tuning absorber are presented.

Language: Английский

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