Binary Au iron oxide nanoparticle/carbon complex for broadband electromagnetic wave absorption

Zhuang, Qiang; Wang, Yanan; Luo, Chengxuan; Ma, Zhiheng; Shi, Lingzi; Chen, Jianxin; Sun, Jianke; Kong, Jie

doi:10.1016/j.carbon.2023.118476

Carbon

2023

DOI: 10.1016/j.carbon.2023.118476

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Binary Au iron oxide nanoparticle/carbon complex for broadband electromagnetic wave absorption

Qiang Zhuang,

Yanan Wang,

Chengxuan Luo

et al.

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2024

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Cited by 11 publications

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Epitaxial Growth of Hierarchical Cu_xS Heterostructures for Broadband Dielectric Response

Zhang,

Zhou,

Yuan

et al. 2024

Adv Funct Materials

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When interacting with an external Electromagnetic (EM) field, symmetric nanostructures, characterized by their periodic crystalline arrangement, typically resonate at specific frequencies. This resonance enhances local electromagnetic fields, leading to strong EM absorption, yet within a narrow absorption range. Conversely, asymmetric nanostructures, distinguished by their complex electric field polarization and distributions, provide broader frequency responses, albeit with generally weaker electromagnetic loss across the broadband. Therefore, striking a balance between wideband and strong absorption using either symmetric or asymmetric nanostructures remains a challenge. Here, a nanostructured epitaxial step‐growth technique is demonstrated that fabricates a CuxS multilevel rod‐like heterostructure with overall axial symmetry. This structure introduces localized asymmetry through variations in a component hierarchy and multilevel rod dimensions during the epitaxial growth process, effectively addressing the aforementioned balance between wideband and strong absorption. Experimental evidence and theoretical simulations confirm that nanostructures possessing these characteristics achieve efficient broadband absorption across a 6.3 GHz bandwidth with just 2.0 mm thickness, owing to the generation of multiple continuous local electric fields and enhanced electric field polarization. It is convincing that this methodology and design concept hold enlightening significance for advancing material and technological innovations in the realm of broadband absorption.

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Epitaxial Growth of Hierarchical Cu_xS Heterostructures for Broadband Dielectric Response

Zhang,

Zhou,

Yuan

et al. 2024

Adv Funct Materials

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Multifunctional Anisotropic Aerogels for Intelligent Electromagnetic Wave Absorption

Yin,

Lin,

Wang

et al. 2024

Adv Funct Materials

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The rapidly developing modern society has higher requirements for intelligent electromagnetic wave absorbing (EMA) materials than ever before. Herein, lightweight, multifunctional metal‐free carbon‐based aerogels (RCPs) with a longitudinal honeycomb porous framework and a transverse neatly layered structure are obtained by heat‐treating graphene oxide/oxidized carbon nanotubes/hexachlorocyclotriphosphazene complex to simultaneously achieve the tunable EMA, flame retardancy, and thermal insulation. The anisotropic structure ensures the tunable properties of the carbon aerogels along with tilt angles according to environmental needs. The honeycomb porous structure effectively promotes multiple reflections and scatterings of electromagnetic waves compared with the layered structure, maximizing the penetration inside the material and thus a high EMA performance. The optimized R10C2P‐4 exhibits a minimum reflection loss in the longitudinal direction of−61.5 dB, while the value is as low as −22.4 dB in the transverse direction. Furthermore, the porous structure adequately inhibits the spread of heat, accompanied by the phosphorus species induced by hexachlorocyclotriphosphazene pyrolysis, endowing a good flame retardancy and thermal insulation with a low thermal conductivity of 20.6 mW m−1 K−1 in the longitudinal direction, rather than the transverse direction. This work provides an ingenious insight into the design of multifunctional EMA materials, adapting flexibly to various application requirements.

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Construction of 3D Fibonacci Cauliflower‐Like NiCo₂S₄/Expanded Graphite Heterogeneous Structures for Enhanced Electromagnetic Wave Absorption

Wei,

Xu,

et al. 2024

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Highly efficient electromagnetic wave (EMW)‐absorbing multicomposites can be fabricated by constructing particular structures using suitable components. Expanded graphite (EG) has a 3D, low‐density porous structure; however, it suffers from poor impedance matching and EMW absorption properties. Based on this information, in the present study, NiCo2S4 components with different morphologies are successfully loaded onto a 3D EG surface using a facile microwave solvothermal method to achieve a synergistic effect between the different components. The NiCo2S4 content is adjusted to alter the compositional morphology and electromagnetic parameters of the composites to achieve impedance‐matching and obtain excellent EMW absorption properties. The heterogeneous interface between EG and NiCo2S4 induces an inhomogeneous spatial charge distribution and enhances interfacial polarization. The defects in the material and oxygen‐containing groups induce dipole polarization, which enhances the polarization‐relaxation process of the composites. The 3D porous heterostructure of the “Fibonacci cauliflower”‐shaped NiCo2S4/EG composites results in an optimal reflection loss of −64.93 dB at a filler rate of only 14 wt.%. Analysis of the synergistic conduction loss and polarization loss mechanisms in carbon‐based materials with heterogeneous interfaces has led to the development of excellent EMW absorption materials.

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Binary Au iron oxide nanoparticle/carbon complex for broadband electromagnetic wave absorption

Cited by 11 publications

References 50 publications

Epitaxial Growth of Hierarchical Cu_xS Heterostructures for Broadband Dielectric Response

Epitaxial Growth of Hierarchical Cu_xS Heterostructures for Broadband Dielectric Response

Multifunctional Anisotropic Aerogels for Intelligent Electromagnetic Wave Absorption

Construction of 3D Fibonacci Cauliflower‐Like NiCo₂S₄/Expanded Graphite Heterogeneous Structures for Enhanced Electromagnetic Wave Absorption

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Binary Au iron oxide nanoparticle/carbon complex for broadband electromagnetic wave absorption

Cited by 11 publications

References 50 publications

Epitaxial Growth of Hierarchical CuxS Heterostructures for Broadband Dielectric Response

Epitaxial Growth of Hierarchical CuxS Heterostructures for Broadband Dielectric Response

Multifunctional Anisotropic Aerogels for Intelligent Electromagnetic Wave Absorption

Construction of 3D Fibonacci Cauliflower‐Like NiCo2S4/Expanded Graphite Heterogeneous Structures for Enhanced Electromagnetic Wave Absorption

Contact Info

Product

Resources

About

Epitaxial Growth of Hierarchical Cu_xS Heterostructures for Broadband Dielectric Response

Epitaxial Growth of Hierarchical Cu_xS Heterostructures for Broadband Dielectric Response

Construction of 3D Fibonacci Cauliflower‐Like NiCo₂S₄/Expanded Graphite Heterogeneous Structures for Enhanced Electromagnetic Wave Absorption