Optimization of Fe@Ag core–shell nanowires with improved impedance matching and microwave absorption properties

Yang, Pingan; Huang, Yuxuan; Li, Rui; Huang, Xin; Ruan, Haibo; Shou, Mengjie; Li, Wanjun; Zhang, Yuxin; Li, Nan; Dong, Lichao

doi:10.1016/j.cej.2021.132878

Cited by 132 publications

(46 citation statements)

References 54 publications

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“…With the rapid development of modern electronic information technology, various electronic devices have provided a lot of convenience to people while also creating potential hazards to human health [ 1 , 2 ]. To cope with the increasingly serious electromagnetic pollution problem, there is an urgent need to develop wave-absorbing materials with high efficiency, a wide band, and strong absorption [ 3 , 4 ]. CIP, as a typical magnetic loss-type radar wave absorber, has the advantages of a high specific saturation magnetization intensity, low cost, and high temperature stability.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electromagnetic Wave Absorption Properties of Ultrathin MnO2 Nanosheet-Decorated Spherical Flower-Shaped Carbonyl Iron Powder

Wang

Yang

et al. 2021

Molecules

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In this work, spherical flower-shaped composite carbonyl iron powder@MnO2 (CIP@MnO2) with CIP as the core and ultrathin MnO2 nanosheets as the shell was successfully prepared by a simple redox reaction to improve oxidation resistance and electromagnetic wave absorption properties. The microwave-absorbing properties of CIP@MnO2 composites with different filling ratios (mass fractions of 20%, 40%, and 60% after mixing with paraffin) were tested and analyzed. The experimental results show that compared with pure CIP, the CIP@MnO2 composites have smaller minimum reflection loss and a wider effective absorption bandwidth than CIP (RL < −20 dB). The sample filled with 40 wt% has the best comprehensive performance, the minimum reflection loss is −63.87 dB at 6.32 GHz, and the effective absorption bandwidth (RL < −20 dB) reaches 7.28 GHz in the range of 5.92 GHz–9.28 GHz and 11.2 GHz–15.12 GHz, which covers most C and X bands. Such excellent microwave absorption performance of the spherical flower-like CIP@MnO2 composites is attributed to the combined effect of multiple beneficial components and the electromagnetic attenuation ability generated by the special spherical flower-like structure. Furthermore, this spherical flower-like core–shell shape aids in the creation of discontinuous networks, which improve microwave incidence dispersion, polarize more interfacial charges, and allow electromagnetic wave absorption. In theory, this research could lead to a simple and efficient process for producing spherical flower-shaped CIP@MnO2 composites with high absorption, a wide band, and oxidation resistance for a wide range of applications.

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Section: Introductionmentioning

confidence: 99%

Enhanced Electromagnetic Wave Absorption Properties of Ultrathin MnO2 Nanosheet-Decorated Spherical Flower-Shaped Carbonyl Iron Powder

Wang

Yang

et al. 2021

Molecules

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“…The unit cell has a sandwiched structure consisting of three layers: the top patterned AgNWs film, the space layer, and the bottom patterned AgNWs film. Both of the AgNWs films used in the structure are fabricated through the commercial standard process and enable the materials to have high optical transparency, and all the patterns are formed by laser etching [35][36][37][38]. The top pattern has a square-shaped split-ring slot.…”

Section: Design and Methodsmentioning

confidence: 99%

Ultrathin and Optically Transparent Microwave Absorber Based on Flexible Silver Nanowire Film

Dong

et al. 2021

Crystals

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The design of an optically transparent and flexible metamaterial absorber was presented and fabricated. For this purpose, we use two different patterned silver nanowire films separated by the space layer, forming a transparent sandwiched structure with an ultrathin thickness. By analyzing the equivalent circuit model and distribution of electric field and current, the absorption physical mechanism has been theoretically investigated. The results show that the structure can achieve above 0.8 absorptions from 6 GHz to 18 GHz, and at the same time, this absorber also can obtain wide-angle property. The optical transmittance of the fabricated absorber exceeds 82% in the visible band. The results demonstrate that transparency and flexibility are the additional benefits that make the proposed absorber suitable for various potential applications.

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“…When the matching thickness is 3.36 mm, the RL min value of −58.69 dB is obtained at 7.53 GHz. When the matching thickness is 2.93 mm, the effective absorption bandwidth is 7.32 GHz, covering the whole C and X bands [83]. Figure 11e provides the electromagnetic wave absorption mechanism of Fe@Ag core-shell NWs.…”

Section: Metal-coated Fementioning

confidence: 99%

Recent Progress in Iron-Based Microwave Absorbing Composites: A Review and Prospective

et al. 2022

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With the rapid development of communication technology in civil and military fields, the problem of electromagnetic radiation pollution caused by the electromagnetic wave becomes particularly prominent and brings great harm. It is urgent to explore efficient electromagnetic wave absorption materials to solve the problem of electromagnetic radiation pollution. Therefore, various absorbing materials have developed rapidly. Among them, iron (Fe) magnetic absorbent particle material with superior magnetic properties, high Snoek’s cut-off frequency, saturation magnetization and Curie temperature, which shows excellent electromagnetic wave loss ability, are kinds of promising absorbing material. However, ferromagnetic particles have the disadvantages of poor impedance matching, easy oxidation, high density, and strong skin effect. In general, the two strategies of morphological structure design and multi-component material composite are utilized to improve the microwave absorption performance of Fe-based magnetic absorbent. Therefore, Fe-based microwave absorbing materials have been widely studied in microwave absorption. In this review, through the summary of the reports on Fe-based electromagnetic absorbing materials in recent years, the research progress of Fe-based absorbing materials is reviewed, and the preparation methods, absorbing properties and absorbing mechanisms of iron-based absorbing materials are discussed in detail from the aspects of different morphologies of Fe and Fe-based composite absorbers. Meanwhile, the future development direction of Fe-based absorbing materials is also prospected, providing a reference for the research and development of efficient electromagnetic wave absorbing materials with strong absorption performance, frequency bandwidth, light weight and thin thickness.

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Optimization of Fe@Ag core–shell nanowires with improved impedance matching and microwave absorption properties

Cited by 132 publications

References 54 publications

Enhanced Electromagnetic Wave Absorption Properties of Ultrathin MnO2 Nanosheet-Decorated Spherical Flower-Shaped Carbonyl Iron Powder

Enhanced Electromagnetic Wave Absorption Properties of Ultrathin MnO2 Nanosheet-Decorated Spherical Flower-Shaped Carbonyl Iron Powder

Ultrathin and Optically Transparent Microwave Absorber Based on Flexible Silver Nanowire Film

Recent Progress in Iron-Based Microwave Absorbing Composites: A Review and Prospective

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