Electromagnetic microwave absorption theory and recent achievements in microwave absorbers

Zeng, Xiaojun; Cheng, Xiaoyu; Yu, Rong; Stucky, Galen D.

doi:10.1016/j.carbon.2020.07.028

Cited by 659 publications

(251 citation statements)

References 229 publications

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“…Nevertheless, there remains much to learn about these systems using, for example, in situ characterization, precise control, mass production, mechanism exploration, and functional application of noble‐metal composites. On the other hand, the versatile design of noble‐metal composites allows them to be used in other interesting emerging fields, covering electromagnetic interference (EMI) shielding, [ 285–287 ] printing, [ 288–291 ] biotechnology, [ 292–294 ] sensors, [ 295–298 ] and solar energy. [ 299–301 ] Based on the unique features of noble‐metal composites, combined with their finely tuned component and structure design, noble‐metal composites can be produced at low cost and in batches, which further promotes their application in the fields of optics, catalysis, medicine, and electricity.…”

Section: Resultsmentioning

confidence: 99%

Rational Component and Structure Design of Noble‐Metal Composites for Optical and Catalytic Applications

Zeng

Zhao

et al. 2021

Small Structures

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Great effort has recently been made to develop noble‐metal nanomaterials with good activity, high durability, and appropriate selectivity to improve their efficiency in functional applications, while maintaining low cost. The use of noble metals not only makes the last requirement hard to meet but also restricts stability at high temperatures and limits mass production. Recently, some promising strategies, such as optimizing the components and fine‐tuning the structure, have been explored, which promise to enable the fabrication of unique noble‐metal nanostructures with lower loading and higher stability. Herein, recent achievements in manufacturing noble‐metal composites are reviewed, particularly focusing on unique and key factors in rational design and control of structure and components. Two applications of noble‐metal composites in optical and catalytic applications are focused on to illustrate their rational synthesis and design. In addition, current challenges and prospects for future development in this rapidly blossoming field are discussed.

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Section: Resultsmentioning

confidence: 99%

Rational Component and Structure Design of Noble‐Metal Composites for Optical and Catalytic Applications

Zeng

Zhao

et al. 2021

Small Structures

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“…In addition, the polarization centers derived from the defects and the groups on surface usually induce the dipolar relaxation loss. Moreover, carbon-based nanomaterials possess a high degree of graphitization with enhanced electrical conductivity, which will increase the imaginary part of the relative complex permittivity, and thereby contribute to superior conduction loss [ 46 ].…”

Section: Electromagnetic Functional Materialsmentioning

confidence: 99%

Recent Advances in Design and Fabrication of Nanocomposites for Electromagnetic Wave Shielding and Absorbing

et al. 2021

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Electromagnetic (EM) pollution has raised significant concerns to human health with the rapid development of electronic devices and wireless information technologies, and created adverse effects on the normal operation of the sensitive electronic apparatus. Notably, the EM absorbers with either dielectric loss or magnetic loss can hardly perform efficient absorption, which thereby limits their applications in the coming 5G era. In such a context, the hotspot materials reported recently, such as graphene, MXenes, and metal-organic frameworks (MOF)-derived materials, etc., have been explored and applied as EM absorbing and shielding materials owing to their tunable heterostructures, as well as the facile incorporation of both dielectric and magnetic components. In this review, we deliver a comprehensive literature survey according to the types of EM absorbing and shielding materials, and interpret the connectivity and regularity among them on the basis of absorbing mechanisms and microstructures. Finally, the challenges and the future prospects of the EM dissipating materials are also discussed accordingly.

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“…Nowadays, microwave absorbing materials (MWAMs) have received great interest for their wide applications in wireless communications, information processing and Radar stealth technologies [1][2][3][4]. To date, a large variety of traditional materials have been developed to be used as MWAMs, such as transition metals (Fe [5], Co [6], Ni [7], Mn [8], and their alloys, ferrites, and ceramics [9,10]).…”

Section: Introductionmentioning

confidence: 99%

Structural Engineering of Hierarchical Aerogels Comprised of Multi-dimensional Gradient Carbon Nanoarchitectures for Highly Efficient Microwave Absorption

et al. 2021

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Recently, multilevel structural carbon aerogels are deemed as attractive candidates for microwave absorbing materials. Nevertheless, excessive stack and agglomeration for low-dimension carbon nanomaterials inducing impedance mismatch are significant challenges. Herein, the delicate “3D helix–2D sheet–1D fiber–0D dot” hierarchical aerogels have been successfully synthesized, for the first time, by sequential processes of hydrothermal self-assembly and in-situ chemical vapor deposition method. Particularly, the graphene sheets are uniformly intercalated by 3D helical carbon nanocoils, which give a feasible solution to the mentioned problem and endows the as-obtained aerogel with abundant porous structures and better dielectric properties. Moreover, by adjusting the content of 0D core–shell structured particles and the parameters for growth of the 1D carbon nanofibers, tunable electromagnetic properties and excellent impedance matching are achieved, which plays a vital role in the microwave absorption performance. As expected, the optimized aerogels harvest excellent performance, including broad effective bandwidth and strong reflection loss at low filling ratio and thin thickness. This work gives valuable guidance and inspiration for the design of hierarchical materials comprised of dimensional gradient structures, which holds great application potential for electromagnetic wave attenuation. "Image missing"

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Electromagnetic microwave absorption theory and recent achievements in microwave absorbers

Cited by 659 publications

References 229 publications

Rational Component and Structure Design of Noble‐Metal Composites for Optical and Catalytic Applications

Rational Component and Structure Design of Noble‐Metal Composites for Optical and Catalytic Applications

Recent Advances in Design and Fabrication of Nanocomposites for Electromagnetic Wave Shielding and Absorbing

Structural Engineering of Hierarchical Aerogels Comprised of Multi-dimensional Gradient Carbon Nanoarchitectures for Highly Efficient Microwave Absorption

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