Controlled Distributed Ti₃C₂T_x Hollow Microspheres on Thermally Conductive Polyimide Composite Films for Excellent Electromagnetic Interference Shielding

Advanced Materials, Год журнала: 2023, Номер 35(16)

Опубликована: Янв. 27, 2023

Flexible multifunctional polymer-based electromagnetic interference (EMI) shielding composite films have important applications in the fields of 5G communication technology, wearable electronic devices, and artificial intelligence. Based on design a porous/multilayered structure using polyimide (PI) as matrix polymethyl methacrylate (PMMA) microspheres template, flexible (Fe3 O4 /PI)-Ti3 C2 Tx -(Fe3 /PI) with controllable pore sizes distribution Ti3 hollow are successfully prepared by sacrificial template method. Owing to structure, when size is 10 µm mass ratio PMMA/Ti3 2:1, film has most excellent EMI performance, effectiveness (EMI SE) 85 dB. It further verified finite element simulation that an effect waves. In addition, good thermal conductivity (thermal coefficient 3.49 W (m·K)-1 ) mechanical properties (tensile strength 65.3 MPa). This conductivity, demonstrated great potential for protection high-power, portable, devices.

Язык: Английский

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Heterostructured BN@Co‐C@C Endowing Polyester Composites Excellent Thermal Conductivity and Microwave Absorption at C Band

Advanced Functional Materials, Год журнала: 2024, Номер 34(19)

Опубликована: Янв. 9, 2024

Abstract The trends of miniaturization, lightweight, and high integration in electronics have brought serious issues heat dissipation electromagnetic compatibility also limited the simultaneous use thermally conductive microwave absorption materials. Therefore, it is imperative to design materials that possess those dual functions. In this work, one‐pot method used anchor zeolitic imidazolate framework ZIF‐67 coated with polydopamine (PDA) on boron nitride (BN) obtain BN@ZIF‐67@PDA. pyrolysis product BN@Co‐C@C as heterostructured conductive/microwave fillers blended polyethylene terephthalate (PET) prepare BN@Co‐C@C/PET composites. When mass ratio BN ZIF‐67@PDA 7.5:1 fraction 7.5 @Co‐C@C 45 wt%, @Co‐C@C/PET composites exhibit excellent thermal conductivities performances. conductivity coefficient 5.37 W m −1 K , which 35.8 times higher than PET (0.15 ), wt% (BN /Co‐C@C)/PET (4.03 ) prepared by directly mixing. minimum reflection loss are −63.1 dB at 4.72 GHz, corresponding effective bandwidth 1.28 GHz (4.08–5.36 GHz), achieving performance C band.

Язык: Английский

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One-Dimensional Magnetic FeCoNi Alloy Toward Low-Frequency Electromagnetic Wave Absorption

Nano-Micro Letters, Год журнала: 2022, Номер 14(1)

Опубликована: Авг. 20, 2022

Rational designing of one-dimensional (1D) magnetic alloy to facilitate electromagnetic (EM) wave attenuation capability in low-frequency (2-6 GHz) microwave absorption field is highly desired but remains a significant challenge. In this study, composite EM absorber made FeCoNi medium-entropy embedded 1D carbon matrix framework rationally designed through an improved electrospinning method. The 1D-shaped demonstrates the high-density and continuous network using off-axis electronic holography technique, indicating excellent loss ability under external field. Then, in-depth analysis shows that many factors, including anisotropy intrinsic physical features alloy, primarily contribute enhanced performance. Therefore, fabricated increasing effective band 1.3 GHz at ultrathin thickness 2 mm. Thus, study opens up new method for design preparation high-performance absorbers.

Язык: Английский

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Hollow engineering of sandwich NC@Co/NC@MnO2 composites toward strong wideband electromagnetic wave attenuation

Journal of Material Science and Technology, Год журнала: 2023, Номер 175, С. 194 - 203

Опубликована: Сен. 6, 2023

Язык: Английский

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Boosted lithium storage performance by local build-in electric field derived by oxygen vacancies in 3D holey N-doped carbon structure decorated with molybdenum dioxide

Journal of Material Science and Technology, Год журнала: 2022, Номер 142, С. 185 - 195

Опубликована: Ноя. 13, 2022

Язык: Английский

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Hierarchical design of FeCo-based microchains for enhanced microwave absorption in C band

Nano Research, Год журнала: 2022, Номер 16(1), С. 1773 - 1778

Опубликована: Окт. 12, 2022

Язык: Английский

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Staggered circular nanoporous graphene converts electromagnetic waves into electricity

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Апрель 8, 2023

Harvesting largely ignored and wasted electromagnetic (EM) energy released by electronic devices converting it into direct current (DC) electricity is an attractive strategy not only to reduce EM pollution but also address the ever-increasing crisis. Here we report synthesis of nanoparticle-templated graphene with monodisperse staggered circular nanopores enabling EM-heat-DC conversion pathway. We experimentally theoretically demonstrate that this nanoporous structure alters graphene's phononic properties synergistically manipulating its intralayer nanostructures interlayer interactions. The exhibits anomalous combination properties, which lead efficient absorption waves heat in turn output DC through thermoelectric effect. Overall, our results advance fundamental understanding structure-property relationships ordered graphene, providing effective generate electric energy.

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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Carbon‐Based Radar Absorbing Materials toward Stealth Technologies

Advanced Science, Год журнала: 2023, Номер 10(32)

Опубликована: Сен. 21, 2023

Abstract Stealth technology is used to enhance the survival of military equipment in field surveillance, as it utilizes a combination techniques render itself undetectable by enemy radar systems. Radar absorbing materials (RAMs) are specialized reduce reflection (or absorption) signals provide stealth capability, which core component passive countermeasures applications. The properties RAMs can be optimized adjusting their composition, microstructure, and surface geometry. Carbon‐based present promising approach for fabrication ultrathin, versatile, high‐performance due large specific area, lightweight, excellent dielectric properties, high electrical conductivity, stability under harsh conditions. This review begins with brief history an introduction electromagnetic waves, systems, materials. followed discussion recent research progress carbon‐based RAMs, including carbon blacks, fibers, nanotubes, graphite, graphene, MXene, along in‐depth examination principles strategies on attenuation characteristics. Hope this will offer fresh perspectives design thereby fostering deeper fundamental understanding promoting practical

Язык: Английский

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