Multifunctional MoC_x Hybrid Polyimide Aerogel with Modified Porous Defect Engineering for Highly Efficient Electromagnetic Wave Absorption

Small, Год журнала: 2024, Номер 20(31)

Опубликована: Март 7, 2024

Abstract Traditional electromagnetic absorbing materials (EWAMs) are usually single functions and can easily affect their performance in diverse application scenarios. Effective integration of EWAMs into multiple function components is a valuable strategy to achieve maximum absorption multifunction while maintaining indispensable physical chemical properties. In this work, the polyoxometalates (POMs) serving as “guests” embedded within Co‐MOFs construct 3d/4d‐bimetallic based crystalline precursors dielectric/magnetic synergistic system. The proper pyrolysis temperature induced homogeneously distributed metallic Co MoC x hetero‐units carbon matrix with modified porous defect engineering enhance wave (EW). Owing brilliant effect polarization, magnetic loss, impedance matching, superior RL min −47.72 dB at 11.76 GHz thickness 2.0 mm wide adequate bandwidth (EAB) 4.58 (7.44–12.02 GHz) covered whole X‐band 2.5 for η ‐MoC/Co@NC‐800 observed. More importantly, resulting hybrid polyimide (MCP) aerogel exhibits desirable properties such structural robustness, nonflammability, excellent thermal insulation, self‐cleaning capabilities that comparable those commercially available products. This work offers inspiration creating multipurpose microwave absorbers intricate designs.

Язык: Английский

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Hierarchical Engineering on Built‐In Electric Field of Bimetallic Zeolitic Imidazolate Derivatives Towards Amplified Dielectric Loss

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Окт. 7, 2024

Abstract Construction of built‐in electric field (BIEF) in nanohybrids has been demonstrated as an efficacious strategy to boost the dielectric loss by facilitating oriented transfer and transition charges, thus optimizing electromagnetic wave absorption property. However, specific influence BIEF on interface polarization needs explore thoroughly strength should be further augmented. Herein, several systems incorporated Mott–Schottky heterojunctions hollow structures are designed constructed, where bimetallic zeolitic imidazolate framework employed derive Cu‐ZnO heterojunctions, hierarchical enriched introducing structure reduced graphene oxide. The well‐established “double” verified theoretical calculation engineering can regulate conductivity, enhance relaxation effectively. Especially, there always coexisted both enhanced charge separation reversed distribution this BIEF, boosting polarization. Attributing synergy well‐matched impedance amplified loss, obtained hybrids exhibited superior (reflection −46.29 dB ultra‐wide effective bandwidth 7.6 GHz at only 1.6 mm). This work proves innovative model for dissecting mechanisms pioneers a novel advanced absorbers through enhancing BIEF.

Язык: Английский

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Carbon nanolayer-mounted single metal sites enable dipole polarization loss under electromagnetic field

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Окт. 21, 2024

Surface modulation strategies have spurred great interest with regard to regulating the morphology, dispersion and flexible processability of materials. Unsurprisingly, customized surfaces is primed offer a route control their electronic functions. To regulate electromagnetic wave (EMW) absorption applications by surface engineering an unmet challenge. Thanks pyrolyzing surface-anchored metal-porphyrin, here we report on four-nitrogen atoms-confined single metal site nitrogen-doped carbon layer (sM(N4)@NC, M = Ni, Co, Cu, Ni/Cu) (sM=single metal; NC= layer) that registers absorption. Surface-anchored metal-porphyrins are afforded attaching them onto polypyrrole via prototypical click reaction. Further, sM(N4)@NC experimentally found elicit identical dipole polarization loss mechanism, overcoming handicaps conductivity loss, defects, interfacial among current EMW absorber models. Importantly, exhibit effective bandwidth 6.44 reflection −51.7 dB, preceding state-of-the-art carbon-based absorbers. This study introduces strategy design absorbers based sites enable fine-tunable controlled mechanism atomistic precision. In this work, Cheng et al. unique dipole-dominated model excluding other redundant opening avenue for exploring future academic studies industrially applicable absorbing

Язык: Английский

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Defect-rich carbon nanosheets derived from p(C3O2)x for electromagnetic wave absorption applications

Carbon, Год журнала: 2024, Номер unknown, С. 119637 - 119637

Опубликована: Сен. 1, 2024

Язык: Английский

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Constructing core-shell structural bimetallic CoNi alloys doped carbon aerogels for highly efficient electromagnetic wave absorption

Journal of Alloys and Compounds, Год журнала: 2025, Номер unknown, С. 178854 - 178854

Опубликована: Янв. 1, 2025

Язык: Английский

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Enhanced electromagnetic wave absorption using bimetallic MOFs-derived TiO2/Co/C heterostructures

Carbon, Год журнала: 2023, Номер 216, С. 118497 - 118497

Опубликована: Окт. 7, 2023

Язык: Английский

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MOF-derived multicore-shell Fe3O4@Fe@C composite: An ultrastrong electromagnetic wave absorber

Carbon, Год журнала: 2023, Номер 215, С. 118477 - 118477

Опубликована: Сен. 28, 2023

Язык: Английский

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Morphology engineering of MIL-88A-derived 0D/1D/2D nanocomposites toward wideband microwave absorption

Journal of Material Science and Technology, Год журнала: 2024, Номер unknown

Опубликована: Дек. 1, 2024

Язык: Английский

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Integrated design of multifunctional lightweight magnetic cellulose-based aerogel with 1D/2D/3D hierarchical network for efficient microwave absorption

Composites Communications, Год журнала: 2024, Номер 49, С. 101987 - 101987

Опубликована: Июль 6, 2024

Язык: Английский

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Gradient-structured MXene/ZIF/CNT hybrid films for largely enhanced electromagnetic absorption in EMI shielding

Chemical Engineering Journal, Год журнала: 2024, Номер unknown, С. 158691 - 158691

Опубликована: Дек. 1, 2024

Язык: Английский

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