Finely modulating the morphology and composition of CuxNi1−x for enhanced microwave absorption capability

Liu, Minmin; Chen, Yue; Wei, Haiyan; Ke, Lifeng; Tong, Guoxiu; Wu, Wenhua

doi:10.1007/s10853-020-04958-z

Cited by 11 publications

(4 citation statements)

References 51 publications

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“…[ 15 ] 9T‐PNNW has the largest saturation magnetization (52.35 emu g −1 ), remanent magnetization (15.37 emu g −1 ), and coercivity (107.46 Oe), indicating that it may have higher magnetic loss. [ 16 ] Furthermore, the Raman spectrum of 9T‐PNNW does not show the characteristic peaks of carbon, suggesting that the interfacial polarization caused by the participation of heteroatoms may not exist (Figure S3, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Magnetic Field‐Induced Synthesis of One‐Dimensional Nickel Nanowires for Enhanced Microwave Absorption

Meng

Liu

Wang

et al. 2022

Adv Materials Inter

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One‐dimensional magnetic nanowires have become one of the ideal candidates for microwave absorption (MA) due to their excellent mechanical properties, large aspect ratio, and excellent electron transport properties. Here, we introduce the synthesis of polyvinylpyrrolidone (PVP)‐directed nickel nanowires (PNNWs) by an externally magnetically induced solvothermal method, and the morphology and properties of PNNWs exhibit a magnetic field‐strength‐dependent relationship. The 9T‐PNNW synthesized at 9 T magnetic field has the characteristics of high aspect ratio, large specific surface area, and good magnetic properties, which endow it with excellent MA performance. The minimum reflection loss (RL) reaches −29.82 dB at 4.08 GHz with the thickness of 4.5 mm and the effective absorption bandwidth (fe) can over 3.6 GHz from 14.4 GHz to 18.0 GHz with a thickness of 1.5 mm. Multiple electromagnetic loss mechanisms are induced to attenuate the electromagnetic wave (EW), in which the dielectric loss dominates, and the magnetic loss, current loss, and resonance effect only play an auxiliary role. This work opens up a new avenue for rational design and preparation of nickel nanowires, and more importantly, the regulation of the magnetic field on the performance of absorbers has reference significance.

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Section: Resultsmentioning

confidence: 99%

Magnetic Field‐Induced Synthesis of One‐Dimensional Nickel Nanowires for Enhanced Microwave Absorption

Meng

Liu

Wang

et al. 2022

Adv Materials Inter

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“…Generally speaking, the magnetic loss is produced by natural resonance, exchange resonance and eddy current loss [49] . The natural resonance usually occurs at lower frequency while exchange resonance occurs at higher frequency [50] . The eddy current loss can be assessed by: [51]

true C_{0} = μ'' {(μ')}^{- 2} f^{- 1}

…”

Section: Resultsmentioning

confidence: 99%

“…[49] The natural resonance usually occurs at lower frequency while exchange resonance occurs at higher frequency. [50] The eddy current loss can be assessed by: [51] C 0 ¼m00ðm0Þ À 2 f À 1…”

Section: Complex Permittivity and Complex Permeabilitymentioning

confidence: 99%

Hierarchically Porous Carbon/α‐Fe@Fe₃C Absorbers Derived from Luffa Sponge with Efficient Microwave Absorption

Zheng

Wang

et al. 2020

ChemistrySelect

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Biomass‐based carbon materials have attracted much attention in the field of microwave absorption because of their light weight, environmental friendliness, low cost and high efficiency. In this work, carbon matrix of porous microtubule structure with different magnetic particles was synthesized from natural luffa sponge by a simple calcination process. The carbon matrix possesses hierarchical porous structures including micrometer‐scale tubular channels, nanometer‐scale macrospores, mesopores and micropores, of which microspores are the most. The Fe3O4, FeO/α‐Fe, α‐Fe/γ‐Fe and α‐Fe/Fe3C particles were formed in the temperature range of 700–1000 °C. The porous carbon/α‐Fe@Fe3C composites obtained at 1000 °C exhibit excellent microwave absorption (MA) performance, its minimum reflection loss can reach −48.9 dB with only a thickness of 1.5 mm, and the effective absorption bandwidth (RL≤−10 dB) is 3.86 GHz. The porous structure, synergies between dielectric loss and magnetic loss, high attenuation constant are the key factors for good MA performance.

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“…However, for interfaces, component differences are expected to cause significant changes in the numbers and distribution of heterojunction interfaces. [26][27][28] Charges then tend to accumulate at these heterojunction interfaces, triggering interfacial polarization and relaxation to dissipate EM energy. [29,30] With respect to defects, some vacancies and lattice defects can be spontaneously generated in this competitive reaction process, through which defect-induced polarization processes are usually triggered, significantly benefiting the boosted dielectric polarization.…”

Section: Introductionmentioning

confidence: 99%

A Competitive Reaction Strategy toward Binary Metal Sulfides for Tailoring Electromagnetic Wave Absorption

Liu

Zhang

Zang

et al. 2021

Adv Funct Materials

173

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The development of multicomponent dielectric composites has become a mainstream approach for obtaining excellent electromagnetic wave (EMW) absorbers. However, conventional component introduction is often performed blindly and based only on semiempirical rules, lacking precise modulation of components, interfaces, and defects during the reaction process. Herein, a competitive reaction mechanism is proposed for the first time, in which not only the metal ion concentration but also its characteristic are two feasible parameters to control the components, interfaces, and defects to tailor the EMW absorption performances of Cu-based binary metal sulfides. The appropriate heterogeneous interfaces and components and the abundant defects can synergistically benefit the EMW absorption capacity by forming perfect impedance matching and multiple dielectric polarizations. As a result, combined with these advantages, an effective absorption band) of 6.80 GHz (6.3-13.1 GHz) is achieved at 2.80 mm for Cu-Co binary metal sulfide, showing the sole middle-frequency broadband absorption of reported sulfidebased absorbers to date. Other Cu-based binary metal sulfides deliver different EMW absorption behaviors. This work breaks through the limitation of traditional component design, opening up a novel methodology for designing multicomponent composites beyond sulfides with broadband absorption.

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Finely modulating the morphology and composition of CuxNi1−x for enhanced microwave absorption capability

Cited by 11 publications

References 51 publications

Magnetic Field‐Induced Synthesis of One‐Dimensional Nickel Nanowires for Enhanced Microwave Absorption

Magnetic Field‐Induced Synthesis of One‐Dimensional Nickel Nanowires for Enhanced Microwave Absorption

Hierarchically Porous Carbon/α‐Fe@Fe₃C Absorbers Derived from Luffa Sponge with Efficient Microwave Absorption

A Competitive Reaction Strategy toward Binary Metal Sulfides for Tailoring Electromagnetic Wave Absorption

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Finely modulating the morphology and composition of CuxNi1−x for enhanced microwave absorption capability

Cited by 11 publications

References 51 publications

Magnetic Field‐Induced Synthesis of One‐Dimensional Nickel Nanowires for Enhanced Microwave Absorption

Magnetic Field‐Induced Synthesis of One‐Dimensional Nickel Nanowires for Enhanced Microwave Absorption

Hierarchically Porous Carbon/α‐Fe@Fe3C Absorbers Derived from Luffa Sponge with Efficient Microwave Absorption

A Competitive Reaction Strategy toward Binary Metal Sulfides for Tailoring Electromagnetic Wave Absorption

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Hierarchically Porous Carbon/α‐Fe@Fe₃C Absorbers Derived from Luffa Sponge with Efficient Microwave Absorption