Shape Anisotropic Chain‐Like CoNi/Polydimethylsiloxane Composite Films with Excellent Low‐Frequency Microwave Absorption and High Thermal Conductivity

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Фев. 13, 2024

Abstract The demand for low‐frequency microwave absorption materials is becoming more and urgent. Novel shape anisotropy chain‐like CoNi fabricated using polyvinylpyrrolidone as a shape‐directing agent via solvothermal method, which then mixed with polydimethylsiloxane (PDMS) to prepare corresponding multifunctional CoNi/PDMS composite films. Shape strong magnetic coupling effect of enhance natural resonance loss capability. minimum reflection (RL min ) −50.5 dB effective bandwidth (EAB) 1.04 GHz (2.64–3.68 GHz) at 3.9 mm CoNi. 18 vol% films present optimal performance RL −56.7 EAB (2.96–4.00 4.1 mm, far superior spherical −9.5 dB. Meantime, the in‐plane inter‐plane thermal conductivity coefficients are 2.05 0.61 W m −1 K , about 1.5 times higher than (1.36 0.42 ), also 220% 190% pure PDMS (0.64 0.21 ). This can broaden applications in 5G communications flexible electronics.

Язык: Английский

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Multiphase Molybdenum Carbide Doped Carbon Hollow Sphere Engineering: The Superiority of Unique Double‐Shell Structure in Microwave Absorption

Small, Год журнала: 2022, Номер 19(6)

Опубликована: Ноя. 27, 2022

In order to achieve excellent electromagnetic wave (EMW) absorption properties, the microstructure design and component control of absorber are critical. this study, three different structures made Mo2 C/C hollow spheres prepared their microwave behavior is investigated. The double-shell consisting an outer thin shell inner rough thick with multiple EMW loss mechanisms exhibit good properties. further improve MoC1-x /C crystalline phases molybdenum carbide optimize capability materials. Finally, α-phase have best When filling 20 wt.%, minimum reflection at 1.8 mm -50.55 dB effective bandwidth 2 5.36 GHz, which expected be a characteristics "thin, light, wide, strong".

Язык: Английский

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Morphology controllable urchin-shaped bimetallic nickel-cobalt oxide/carbon composites with enhanced electromagnetic wave absorption performance

Journal of Material Science and Technology, Год журнала: 2022, Номер 148, С. 250 - 259

Опубликована: Дек. 29, 2022

Язык: Английский

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The art of framework construction: hollow-structured materials toward high-efficiency electromagnetic wave absorption

Advanced Composites and Hybrid Materials, Год журнала: 2022, Номер 5(3), С. 1658 - 1698

Опубликована: Июнь 17, 2022

Язык: Английский

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Recent progress of perovskite oxides and their hybrids for electromagnetic wave absorption: a mini-review

Advanced Composites and Hybrid Materials, Год журнала: 2022, Номер 5(3), С. 2440 - 2460

Опубликована: Апрель 25, 2022

Язык: Английский

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Initiating Binary Metal Oxides Microcubes Electromagnetic Wave Absorber Toward Ultrabroad Absorption Bandwidth Through Interfacial and Defects Modulation

Nano-Micro Letters, Год журнала: 2023, Номер 15(1)

Опубликована: Окт. 9, 2023

Cobalt nickel bimetallic oxides (NiCo2O4) have received numerous attentions in terms of their controllable morphology, high temperature, corrosion resistance and strong electromagnetic wave (EMW) absorption capability. However, broadening the bandwidth is still a huge challenge for NiCo2O4-based absorbers. Herein, unique NiCo2O4@C core-shell microcubes with hollow structures were fabricated via facile sacrificial template strategy. The concentration oxygen vacancies morphologies three-dimensional (3D) cubic framework effectively optimized by adjusting calcination temperature. specially designed 3D structure facilitated multiple reflections incident waves provided rich interfaces between components, generating significant interfacial polarization losses. Dipole polarizations induced could further enhance attenuation ability EM waves. exhibit superior EMW capability minimum RL (RLmin) -84.45 dB at 8.4 GHz thickness 3.0 mm. Moreover, ultrabroad effective (EAB) as large 12.48 (5.52-18 GHz) obtained. This work believed to illuminate path synthesis high-performance cobalt absorbers excellent capability, especially bandwidth.

Язык: Английский

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Magnetic manganese-based composites with multiple loss mechanisms towards broadband absorption

Nano Research, Год журнала: 2022, Номер 15(6), С. 5590 - 5600

Опубликована: Март 29, 2022

Язык: Английский

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Multifunctional SiC aerogel reinforced with nanofibers and nanowires for high-efficiency electromagnetic wave absorption

Chemical Engineering Journal, Год журнала: 2023, Номер 467, С. 143518 - 143518

Опубликована: Май 16, 2023

Язык: Английский

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High-conductivity nickel shells encapsulated wood-derived porous carbon for improved electromagnetic interference shielding

Carbon, Год журнала: 2023, Номер 213, С. 118208 - 118208

Опубликована: Июнь 13, 2023

Язык: Английский

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Integration of Multiple Heterointerfaces in a Hierarchical 0D@2D@1D Structure for Lightweight, Flexible, and Hydrophobic Multifunctional Electromagnetic Protective Fabrics

Nano-Micro Letters, Год журнала: 2023, Номер 15(1)

Опубликована: Авг. 25, 2023

The development of wearable multifunctional electromagnetic protective fabrics with multifunctional, low cost, and high efficiency remains a challenge. Here, inspired by the unique flower branch shape "Thunberg's meadowsweet" in nature, nanofibrous composite membrane hierarchical structure was constructed. Integrating sophisticated 0D@2D@1D structures multiple heterointerfaces can fully unleash application potential membrane. targeted induction method used to precisely regulate formation site morphology metal-organic framework precursor, intelligently integrate heterostructures enhance dielectric polarization, which improves impedance matching loss mechanisms wave absorbing materials. Due synergistic enhancement electrospinning-derived carbon nanofiber "stems", MOF-derived nanosheet "petals" transition metal selenide nano-particle "stamens", CoxSey/NiSe@CNSs@CNFs (CNCC) obtains minimum reflection value (RLmin) -68.40 dB at 2.6 mm maximum effective absorption bandwidth (EAB) 8.88 GHz thin thickness 2.0 filling amount only 5 wt%. In addition, multi-component heterostructure endow fibrous excellent flexibility, water resistance, thermal management, other properties. This work provides perspectives for precise design rational fabrics.

Язык: Английский

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