Interface engineering in the hierarchical assembly of carbon-confined Fe<sub>3</sub>O<sub>4</sub> nanospheres for enhanced microwave absorption

Shi, Xin; Wu, Zhihua; Liu, Zhengwang; Lv, Guo jian; Zi, Zhenfa; Che, Renchao

doi:10.1039/d1ta11005e

Cited by 41 publications

(19 citation statements)

References 55 publications

(81 reference statements)

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“…The Cole–Cole curve is generally used to analyze the dielectric loss due to polarization loss and conductivity loss. 39 In accordance with Debye theory, the polarization mechanism in the dielectric can be explained by the following formula:where ε ∞ and ε s are equivalent to the relative permittivity and static permittivity of the high frequency limit. Theoretically, each and every Cole–Cole semicircle can be attributed to a Debye relaxation process associated with the dielectric polarization effect.…”

Section: Resultsmentioning

confidence: 97%

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Indium tin oxide as a dual-band compatible stealth material with low infrared emissivity and strong microwave absorption

Wan

et al. 2023

J. Mater. Chem. C

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Section: Resultsmentioning

confidence: 97%

“…37,38 The Cole-Cole curve is generally used to analyze the dielectric loss due to polarization loss and conductivity loss. 39 In accordance with Debye theory, the polarization mechanism in the dielectric can be explained by the following formula:…”

Section: Ma Performancementioning

confidence: 99%

Indium tin oxide as a dual-band compatible stealth material with low infrared emissivity and strong microwave absorption

Wan

et al. 2023

J. Mater. Chem. C

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“…The MA performance of composites is evaluated by transmission line theory (Equations S1 and S2, Supporting Information). [37][38][39] In general, RL ≤ −10 dB is recognized as an effective MA. Compared with pristine CF, the MA performance of CNCs/CF is substantially enhanced (Figure 3; Figures S8 and S9, Supporting Information).…”

Section: High-efficiency Ma Performancementioning

confidence: 99%

Carbon Nanocoils/Carbon Foam as the Dynamically Frequency‐Tunable Microwave Absorbers with an Ultrawide Tuning Range and Absorption Bandwidth

Shi

Wang

et al. 2022

Adv Funct Materials

104

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The absorption frequency of conventional microwave absorbing materials (MAMs) is hardly tuned in operando, while such dynamic frequency regulation of MAMs is of great significance to meet the high demands of modern radars and intelligent electron devices. Here, an ingenious frequency-tuning strategy by means of the pressure variations is developed by fabricating highly compressible carbon nanocoils/carbon foam (CNCs/CF) as a dynamically frequency-tunable microwave absorber. Through adjusting the compression strain, the absorption bandwidth of CNCs/CF can be precisely tuned from S-band (2−4 GHz) to Ku-band (12−18 GHz). The adjustable effective absorption bandwidth is as wide as 15.4 GHz, which covers 96% of the entire microwave frequency. Under 10% compression strain, CNCs/ CF shows an attractive bandwidth of 9.0 GHz and a strong reflection loss of −64.6 dB. Furthermore, the CNCs/CF also exhibit a good thermal insulation, strong hydrophobicity, and strain-sensitive conductivity, endowing them with fascinating functions of heat insulation and self-cleaning. The method of utilizing an external pressure to dynamically adjust the absorption frequencies of CNCs/CF is demonstrated for the first time, which opens an avenue for the applications of dynamically frequency-tunable MAMs with an ultrawide adjusting range and absorption bandwidth.

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“…It makes our daily life more convenient while also triggers a serious issue electromagnetic interference (EMI). Moreover, the demands of antiradar coating for military equipment such as aircraft become more severe due to the improvement of radar systems. − Recently, to relieve the ever-increasing pressure on environment and improve the stealth capability of military equipment, more and more research on improvement of microwave absorption properties of the materials has been undertaken. − …”

Section: Introductionmentioning

confidence: 99%

Determining the Actual Composition of Nb⁵⁺–Ni²⁺ Codoped Barium Ferrites to Controllably Regulate the Microwave Absorbing Properties

et al. 2022

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The substitution amount of foreign ions for Fe3+ ions significantly influences the electromagnetic and microwave absorption performance of barium ferrite. To establish the correlation between composition and property, Nb5+–Ni2+ codoped M-type barium ferrite powders with molar ratio of the added Ba2+, Fe3+, Nb5+, and Ni2+ ions being 1:(12–2x):x:x (x = 0–0.8) were prepared by the sol–gel method. The actual substitution amount of Nb5+ and Ni2+ ions for Fe3+ ions are theoretically determined based on the measured concentrations of Fe2+ ions, surface absorbed oxygen, and the lattice parameters of the doped barium ferrite. The calculation results demonstrate that the substitution amount of Ni2+ ions is obviously lower than that of Nb5+ ions in the doped barium ferrites, while the total substitution amount of Nb5+–Ni2+ is still higher than the only Nb5+ ions doping case. As a result, the multiresonant permeability is obviously achieved and dual reflection loss peaks with broad bandwidth ∼12 GHz are apparently observed in the BFNNO with x = 0.4–0.6 over 18–40 GHz. Moreover, the frequency of reflection loss peaks can be adjusted to cover wider frequency range −18 GHz to +40 GHz with variation of x from 0 to 0.8. The developed theoretical calculation approach provides powerful guidance for the controllable design of material composition and regulation of microwave absorption.

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Interface engineering in the hierarchical assembly of carbon-confined Fe₃O₄ nanospheres for enhanced microwave absorption

Cited by 41 publications

References 55 publications

Indium tin oxide as a dual-band compatible stealth material with low infrared emissivity and strong microwave absorption

Indium tin oxide as a dual-band compatible stealth material with low infrared emissivity and strong microwave absorption

Carbon Nanocoils/Carbon Foam as the Dynamically Frequency‐Tunable Microwave Absorbers with an Ultrawide Tuning Range and Absorption Bandwidth

Determining the Actual Composition of Nb⁵⁺–Ni²⁺ Codoped Barium Ferrites to Controllably Regulate the Microwave Absorbing Properties

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Interface engineering in the hierarchical assembly of carbon-confined Fe3O4 nanospheres for enhanced microwave absorption

Cited by 41 publications

References 55 publications

Indium tin oxide as a dual-band compatible stealth material with low infrared emissivity and strong microwave absorption

Indium tin oxide as a dual-band compatible stealth material with low infrared emissivity and strong microwave absorption

Carbon Nanocoils/Carbon Foam as the Dynamically Frequency‐Tunable Microwave Absorbers with an Ultrawide Tuning Range and Absorption Bandwidth

Determining the Actual Composition of Nb5+–Ni2+ Codoped Barium Ferrites to Controllably Regulate the Microwave Absorbing Properties

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Product

Resources

About

Interface engineering in the hierarchical assembly of carbon-confined Fe₃O₄ nanospheres for enhanced microwave absorption

Determining the Actual Composition of Nb⁵⁺–Ni²⁺ Codoped Barium Ferrites to Controllably Regulate the Microwave Absorbing Properties