Hollow double-shell structured Void@SiO2@Co-C composite for broadband electromagnetic wave absorption

Liu, Guiliang; Liu, Xiaofang; Song, Zhiming; Sun, Xin; Wang, Yongdong; Shui, Jianglan; Yu, Rong

doi:10.1016/j.cej.2020.128093

Cited by 34 publications

(11 citation statements)

References 69 publications

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“…As a result, the conductivity and the permittivity play key roles in determining the microwave dissipation ability. According to the Maxwell-Garnett theory, 8,57 the hollow interior and the porous shell structure could reduce the effective permittivity and conductivity, and thus lead to improved impedance matching. Moreover, the presence of the conductive FeNi alloy and the nonconductive nickel ferrite phase will provide another possibility to further regulate the permittivity, impedance matching, and even dissipation ability (by introducing extra heterogeneous interfaces and dissipation mechanisms).…”

Section: Resultsmentioning

confidence: 99%

FeNi alloy and nickel ferrite codoped carbon hollow microspheres for high-efficiency microwave absorption

Liu

Liao

et al. 2022

J. Mater. Chem. C

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Section: Resultsmentioning

confidence: 99%

FeNi alloy and nickel ferrite codoped carbon hollow microspheres for high-efficiency microwave absorption

Liu

Liao

et al. 2022

J. Mater. Chem. C

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“…The interfaces in Co-Ni/C include the Co-Ni interface, Co-C interface, and Ni-C interface as well as the interface between Co-Ni/C and epoxy resin. The presence of C and N defects in the sample results in an asymmetric distribution of charges, causing dipole polarization [20]. There are two obvious resonance peaks in ε" of the S-32 sample, indicating the existence of two extremely strong polarization processes.…”

Section: Microwave Absorption Mechanism Of Co-ni/cmentioning

confidence: 99%

ZIF-67 Derived Co-Ni/C Composites for High-Efficiency Broadband Microwave Absorption

Li¹,

Zhao²,

Zhao³

et al. 2022

Coatings

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The development of broadband and high-efficiency broadband microwave-absorbing materials is one of the keys to resisting electromagnetic radiation and electromagnetic interference. In this paper, we used zeolitic imidazolate framework-67 (ZIF-67) as the template to obtain Ni-doped ZIF-67 via Ni(NO3)2 etching followed by pyrolysis to prepare Co-Ni/C composites successfully. The morphology and microstructure of Co-Ni/C composites can be well-tuned by altering the Ni doping content. ZIF-67-derived Co-Ni/C porous materials exhibit extremely strong microwave absorption performance thanks to dielectric loss, magnetic loss, and the synergistic effect between different components. When the dosage of Ni(NO3)2 used reaches 0.32 g, the obtained composite possesses the optimal absorbing properties with a maximum reflection loss (RL) of −72.88 dB and an effective bandwidth (fe, representing RL ≤ −10 dB) of 7.04 GHz (9.76–16.8 GHz) corresponding to a thickness of 2.53 mm. The results of this work indicate that Co-Ni/C composites have potential application value in the field of microwave absorption.

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“…The luxuriant interfacial structures can enhance polarization relaxation in the high‐frequency range. Recently, the progress in the effect of microstructures, such as nanoflakes, [ 53 ] honeycomb‐ like, [ 54 ] hollow, [ 55 ] foam, [ 56‐59 ] core‐shell, [ 60‐61 ] nanowires, [ 62 ] capsules, [ 63 ] nanorod, [ 64 ] fibres, [ 65 ] hollow, [ 66 ] yolk‐shell, [ 67 ] microsphere, [ 68 ] attracted much attention through the design of a series of micro morphologies for regulating microwave absorption. The above synchronous overlap of loss mechanisms can efficiently enhance and broaden microwave absorption performance.…”

Section: Introductionmentioning

confidence: 99%

Review and Perspective of Tailorable Metal‐Organic Framework for Enhancing Microwave Absorption

Miao

Chen

et al. 2023

Chin. J. Chem.

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Comprehensive Summary Metal‐organic frameworks (MOFs) and their pyrolytic derivates, displaying diverse chemical compositions and microstructures, provide the infinite potential for preparing high‐performance microwave absorption materials (MAMs) and have attracted extensive attention. In this review, we systematically reviewed the recent progress of MOF‐based MAMs, including three types of MOF‐based MAMs (MOF‐derived metal/carbon nanocomposites, MOF‐based hybridization materials and conductive MOF). Besides that, the microwave absorption properties and their related physical and chemical appearance were also analyzed. On behalf of synergistic effects between microstructures, dielectric components and magnetic response, the MOF‐based MAMs show excellent microwave absorption performance, which is superior to that of traditional single metal, metal alloy and pure carbon‐based MAMs. Furthermore, the novel conductive MOF with tunable electrical conductivity shows great potential in MAMs due to the fact that it can dramatically simplify the synthesis process.

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Hollow double-shell structured Void@SiO2@Co-C composite for broadband electromagnetic wave absorption

Cited by 34 publications

References 69 publications

FeNi alloy and nickel ferrite codoped carbon hollow microspheres for high-efficiency microwave absorption

FeNi alloy and nickel ferrite codoped carbon hollow microspheres for high-efficiency microwave absorption

ZIF-67 Derived Co-Ni/C Composites for High-Efficiency Broadband Microwave Absorption

Review and Perspective of Tailorable Metal‐Organic Framework for Enhancing Microwave Absorption

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