The Elaborate Design of Multi‐Polarization Effect by Non‐Edge Defect Strategy for Ultra‐Broad Microwave Absorption

Advanced Functional Materials, Год журнала: 2024, Номер 34(44)

Опубликована: Май 21, 2024

Abstract Anion defect engineering is proven to be an efficient approach reconstruct the electronic configuration of carbon‐based magnetoelectric materials for targeted modulation electromagnetic (EM) performance. However, traditional mono‐anionic doping suffers from low concentration and lacks diverse polarization mechanisms. In this work, multi‐anions (N/S/F) stepwise‐doped carbon/Fe 3 C composites are elaborately constructed, wherein predesigned N defects serve as activated sites anomalously adopting S anions (Step I) subsequent F II) in non‐marginal areas carbon layer. It found that prefers replace pyrrolic while tends form dangling bonds with site adjacent pyridinic N. Intriguingly, besides inherent polarized resonance at ≈15 GHz, customized induce new resonances ≈10 GHz ≈15+ respectively. Under a typical multi‐polarization effect synergetic magnetic response, N/S/F harvest broadest bandwidth 8.28 (9.72–18 GHz) 2.55 mm, covering wide frequency range almost X Ku bands. This work demonstrates positive impact localized multi‐defects customization on expanding microwave absorption bandwidth, providing valuable insights advanced design ultra‐broadband absorbers.

Язык: Английский

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Metal organic frameworks derived NixSey@NC hollow microspheres with modifiable composition and broadband microwave attenuation

Carbon, Год журнала: 2024, Номер 226, С. 119215 - 119215

Опубликована: Май 4, 2024

Язык: Английский

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Mechanisms, design, and fabrication strategies for emerging electromagnetic wave-absorbing materials

Cell Reports Physical Science, Год журнала: 2024, Номер 5(7), С. 102097 - 102097

Опубликована: Июль 1, 2024

The rapid development of intelligent devices imposes new demands on electromagnetic wave (EMW)-absorbing materials, especially concerning wide-spectrum absorption, frequency band manipulation, and multifunctional integration. However, conventional investigations EMW-absorbing materials face several challenges that collectively limit the effectiveness existing amid growing demands, including ambiguous (EM) loss mechanisms, impedance mismatches, deficiencies in integrated design. This review elucidates EM delineates key bridge mechanisms linking microscopic macroscopic factors, proposes dielectric polarization models to clarify mechanisms. Additionally, it delves into unique advantages core-shell structures porous optimization. Finally, introduces fabrication approaches integrate detailing design strategies exploring potential applications. By consolidating these cutting-edge achievements, this aims guide scientific advancement materials.

Язык: Английский

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

Nano-Micro Letters, Год журнала: 2024, Номер 17(1)

Опубликована: Сен. 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.

Язык: Английский

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

Nano Letters, Год журнала: 2024, Номер unknown

Опубликована: Дек. 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.

Язык: Английский

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MXene Hybridized Polymer with Enhanced Electromagnetic Energy Harvest for Sensitized Microwave Actuation and Self-Powered Motion Sensing

Nano-Micro Letters, Год журнала: 2024, Номер 17(1)

Опубликована: Ноя. 18, 2024

Polymeric microwave actuators combining tissue-like softness with programmable microwave-responsive deformation hold great promise for mobile intelligent devices and bionic soft robots. However, their application is challenged by restricted electromagnetic sensitivity intricate sensing coupling. In this study, a sensitized polymeric actuator fabricated hybridizing liquid crystal polymer Ti

Язык: Английский

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Magneto-Dielectric Synergy and Multiscale Hierarchical Structure Design Enable Flexible Multipurpose Microwave Absorption and Infrared Stealth Compatibility

Nano-Micro Letters, Год журнала: 2024, Номер 17(1)

Опубликована: Окт. 16, 2024

Developing advanced stealth devices to cope with radar-infrared (IR) fusion detection and diverse application scenarios is increasingly demanded, which faces significant challenges due conflicting microwave IR cloaking mechanisms functional integration limitations. Here, we propose a multiscale hierarchical structure design, integrating wrinkled MXene shielding layer flexible Fe

Язык: Английский

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A Rapidly Assembled and Camouflage‐Monitoring‐protection Integrated Modular Unit

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Дек. 17, 2024

Optical-electromagnetic compatible devices are urgently required in intelligent building monitors and cross-band protection. Meanwhile, the insufficient systematicness semi-empirical attempts significantly limit prosperity of materials, causing enormous challenges for deviceization material database construction. Herein, systematical component-deviceization-machine learning prediction-array construction strategy is attempted to solve bottleneck issues. A luminance-triggered camouflage-monitoring-protection triune integrated modular unit (IMU) hierarchically encapsulated simultaneously achieve efficient anti-electromagnetic interference (EMI), light-absorbing, quick gradient-colorization response. Moreover, an illumination intensity dataset a surrogate model based on fully connected neural network fitting (FCNN-fitting) constructed, which accurately predicts light-absorbing property IMUs can be instructional selection. The specifically assembled into 4*4 array, aiming at multi-scenario application programmable display, camouflage pattern, surface conformality, rapid replaceability. This work paves path provides promising optical-electromagnetic compatibility genetics-deviceization-array systematization.

Язык: Английский

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Hetero‐Dimensional Micro‐Nano Architectures Toward Electromagnetic Devices and Hybrid Energy Transport

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Ноя. 14, 2024

Abstract Human spaceflight, lunar exploration projects, and interstellar travel are the grand visions of human universe. However, energy sustainability these projects is a concern. Electromagnetic functional materials devices expected to fulfill their potential in electronic communication utilization. Herein, hetero‐dimensional micro‐nano architectures composed Cu 3 Se 2 microspheres reduced graphene oxide (rGO) sheets fabricated for first time by sacrificial template method, anion substitution engineering, electrostatic adsorption, reduction‐oxidation reaction. Based on excellent electromagnetic response composites, they exhibit strong ultra‐wide microwave absorption ability with effective bandwidth (EAB) reaching 8.24 GHz at thickness 2.2 mm. In addition, an metamaterial EAB ≈13.5 proposed, exhibiting significant properties. More significantly, composites can be used construct range devices: spiral antenna adjustable return loss gain, maximum gain up 2.5 dBi; microstrip power divider that efficiently split input signal into four equal parts output it; hybridized transport device convert store energy. This work provides new inspiration protection, communication, development.

Язык: Английский

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Multifunction integration within magnetic CNT-bridged MXene/CoNi based phase change materials

eScience, Год журнала: 2024, Номер unknown, С. 100292 - 100292

Опубликована: Июнь 1, 2024

Developing advanced nanocomposite phase change materials (PCMs) integrating zero-energy thermal management, microwave absorption, photothermal therapy and electrical signal detection can promote the leapfrog development of flexible wearable electronic devices. For this goal, we propose a multidimensional collaborative strategy combining two-dimensional (2D) MXene nanosheets with metal-organic framework-derived one-dimensional (1D) carbon nanotubes (CNTs) zero-dimensional (0D) metal nanoparticles. After encapsulating paraffin wax (PW) in three-dimensional (3D) networked MXene/CoNi-C, resulting composite PCMs exhibit excellent energy storage capacity long-term thermally reliable stability. Benefiting from synergistically enhanced effects CNTs, Co/Ni nanoparticles MXene, PW@MXene/CoNi-C capture photons efficiently transfer phonons quickly, yielding an ultrahigh conversion efficiency 97.5%. Additionally, high absorption minimum reflection loss −49.3 dB at 8.03 GHz heat-related application scenarios. More attractively, corresponding film simultaneously achieve management electromagnetic shielding devices, as well for individuals. This functional integration design provides important reference developing multifunctional

Язык: Английский

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