Excellent microwave absorption property of nano-Ni coated hollow silicon carbide core-shell spheres

Wei, Bo; Zhou, Jintang; Yao, Zhengjun; Qian, Kun; Hu, Lin; Guo, Xinlu; Chen, Wenjing

doi:10.1016/j.apsusc.2020.145261

Cited by 64 publications

(18 citation statements)

References 75 publications

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“…The real part ε′ of the permittivity and the real part of the permeability μ′ indicate the storage capacity of the EM field, whereas the imaginary part of the permittivity ε″ and the imaginary part of the permeability μ″ indicate the loss of the EM field. 9,53 The real part of the permittivity of the sample is shown in Figure 7a. Generally, the permittivity of the sample decreases with the increase in frequency, which is mainly caused by polarization relaxation.…”

Section: ■ Resultsmentioning

confidence: 99%

“…The permittivity (ε r = ε′ – jε″) and the permeability (μ r = μ′ – jμ″) capture the response of the samples to the EM field. The real part ε′ of the permittivity and the real part of the permeability μ′ indicate the storage capacity of the EM field, whereas the imaginary part of the permittivity ε″ and the imaginary part of the permeability μ″ indicate the loss of the EM field. , …”

Section: Resultsmentioning

confidence: 99%

“…Sustainable technological growth therefore needs an effective electromagnetic pollution management system. − Therefore, the development of electromagnetic absorbing materials that are ultrathin and lightweight, with wide effective absorption bandwidth (EAB), is highly desirable for the production of micro- or nanoelectronics and sensors . Recently, high-dielectric semiconductor materials such as silicon carbide, , zinc oxide, , and molybdenum sulfide , have shown promising effectiveness in EW absorption due to their unique electron transport characteristics. The n-type vacancies or n-type vacancies in these materials will form a space electric dipole and thus provide polarization loss.…”

Section: Introductionmentioning

confidence: 99%

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Liquid Metal-Derived Two-Dimensional Layered Double Oxide Nanoplatelet-Based Coatings for Electromagnetic Wave Absorption

Zhang

Zhou

et al. 2021

ACS Appl. Nano Mater.

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Room-temperature liquid metals offer intriguing chemistry for obtaining atomic nanomaterials with unique composition and morphologies. However, the use of liquid metals for the synthesis of layered double oxide (LDO) materials has rarely been reported. When surrounded with water, liquid metal alloys produce low-dimensional hydroxides on their interfacial regions. In this work, highly electrostatically polarized twodimensional (2D) aluminum hydroxides, featuring OH bonds, are devised as adsorption sites for divalent cations including Ni 2+ , Co 2+ , Mg 2+ , Mn 2+ , Zn 2+ , and Fe 2+ ions. For Ni 2+ and Co 2+ ions, remarkably, through changing synthesis conditions, different orientations of 2D Al/NiCo-LDO nanoplatelets can be synthesized. The change in the orientation of the surface platelets, that is, parallel or vertical, to the plane of aluminum oxide resulted in excellent electromagnetic wave (EW) absorption performance. The effective absorption bandwidth reaches 5.61 GHz at a composite thickness of only 1.7 mm. The different nanomorphology and annealing temperature of Al/NiCo-LDO resulted in fundamentally different electromagnetic losses. Results indicating the developed framework have tunable and excellent EW absorption capabilities. 2D Al/NiCo-LDOs prepared by the developed liquid metal synthesis method shows a great promise for applications in the fields of EW absorption and electromagnetic protection. Due to their lightweight, high-surface-area, and mechanically strong material features, aluminum oxide compounds are suitable for the synthesis of other LDO compounds including Mg 2+ , Mn 2+ , Zn 2+ , and Fe 2+ . The incorporation of a variety of divalent cations into the nanostructure and facet engineering are promising pathways for the production of reinforced lightweight nanomaterials for utilization in various applications. This work fundamentally explores the effect of achieved materials' polarization through fully characterizing the absorption.

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Section: ■ Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Liquid Metal-Derived Two-Dimensional Layered Double Oxide Nanoplatelet-Based Coatings for Electromagnetic Wave Absorption

Zhang

Zhou

et al. 2021

ACS Appl. Nano Mater.

Self Cite

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“…[ 11 ] Carbon shell and SiO 2 shell are the most common choices to design hollow MA materials due to their easy fabrication and unique electrical property. [ 12 ] Hollow carbon nanospheres, [ 13 ] Ni‐coated hollow silicon carbide spheres, [ 14 ] hollow SiO 2 @Ni‐C microspheres, [ 15 ] and hollow PDA@α‐MnO 2 microspindles [ 16 ] have demonstrated strong mMA capabilities with relatively lower filler loading, providing new insight for novel microwave absorbers. Notably, the plentiful heterogeneous interfaces introduced by core–shell and hollow structures are attached to great importance by many scientists more recently.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Nonspherical Hollow Architecture with Magnetic Fe Core and Ni Decorated Tadpole‐Like Shell as Ultrabroad Bandwidth Microwave Absorbers

You

Zhang

et al. 2021

Small

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The advancement of electromagnetic (EM) protection technology promotes the urgent demand for the structural design of electromagnetic functional materials. Here, tadpole‐like Fe@SiO2@C‐Ni (FSCN) composites with magnetic core–shell and nonspherical hollow architectures through multiple hydrolysis‐polymerization reactions are reported. The Fe core and well‐distributed Ni nanoparticles greatly promote the magnetic properties of FSCN and construct a multiscale magnetic coupling network. Meanwhile, the multishell composites consisting of carbon shell with Ni decorated possess an abundance of heterogeneous interfaces, generating effective interfacial polarization and relaxation. The hollow feature and the coordination of magnetic and dielectric capacities offer an optimized impedance balance, providing a fundament for the microwaves propagating into the absorber. Owing to the attractive effects resulted from the deliberate tadpole‐like structure design, the FSCN composites ensure an effective EM energy conversion at the high‐frequency region, which obtain the strongest reflection loss value of −45.2 dB and the extremely broad effective absorption bandwidth of 13.1 GHz. This work provides an important solution for magnetic‐dielectric nanostructure design for microwave absorption and energy conversion materials.

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“…[ 1–4 ] However, the EM radiation and interference have gradually affected people's production and life, which causes EM pollution to human beings. [ 5–7 ] In addition, radar, infrared, and other detection technologies have been widely used in the field of aerospace and aviation with the development of the electronic information technology, [ 8–10 ] making EM wave absorption stealth technology become the focus of research. [ 11 ] Therefore, in the field of EM pollution protection and radar stealth technology, there is an urgent need to develop “thin, light, wide, and strong” high‐performance EM wave absorption materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of polyimide/carbon nanotube composite films with electromagnetic wave absorption performance

Jiang

Lin

Jia

et al. 2021

Polymer Engineering & Sci

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The polyimide (PI)/carbon nanotube (CNT) films including 3,3′,4,4′‐biphenyl tetracarboxylic dianhydride (BPDA), p‐phenylenediamine (p‐PDA), and CNTs were prepared, which have prominent electromagnetic (EM) wave absorption performance. Experimental analyses of the mechanical properties, thermal stabilities, coefficient of thermal expansion (CTE), the glass transition temperature (Tg), and EM parameter revealed the beneficial effects of the CNTs on the resulting composite films. In particular, when the content of CNTs is 6 wt%, the film shows the highest EM wave absorption performance, which exhibits the effective absorption bandwidth of 2.72 GHz with the matching thickness of only 2.0 mm. These results indicate that PI‐based films have a certain potential application in the area of EM wave‐absorbing materials.

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Excellent microwave absorption property of nano-Ni coated hollow silicon carbide core-shell spheres

Cited by 64 publications

References 75 publications

Liquid Metal-Derived Two-Dimensional Layered Double Oxide Nanoplatelet-Based Coatings for Electromagnetic Wave Absorption

Liquid Metal-Derived Two-Dimensional Layered Double Oxide Nanoplatelet-Based Coatings for Electromagnetic Wave Absorption

Synthesis of Nonspherical Hollow Architecture with Magnetic Fe Core and Ni Decorated Tadpole‐Like Shell as Ultrabroad Bandwidth Microwave Absorbers

Preparation and properties of polyimide/carbon nanotube composite films with electromagnetic wave absorption performance

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