Hydrothermal synthesis of polyhedral FeCo alloys with enhanced electromagnetic absorption performances

Zhou, Jun; Shu, Xiangfeng; Wang, Zhecheng; Liu, Yin; Wang, Yueqin; Zhou, Chang Ling; Kong, Lingbing

doi:10.1016/j.jallcom.2019.04.217

Cited by 69 publications

(18 citation statements)

References 46 publications

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“…Furthermore, as the additive volume of EDA increases, both ε″ and ε′ show gradually increasing trends. According to the free electron theory, the higher the electrical conductivity is, the stronger conduction loss specimens have; [38,39] this result is consistent with the experimentally measured electrical conductivity ( Figure S1, Supporting Information). In addition, all the specimens show some visible relaxation peaks of ε″ and ε′ in the high-frequency region (14-18 GHz, marked by the vertical bars in Figure S3a,b, Supporting Information), and these relaxation peaks are caused by polarization loss.…”

Section: Resultssupporting

confidence: 87%

Nitrogen‐Doping‐Regulated Electromagnetic Wave Absorption Properties of Ultralight Three‐Dimensional Porous Reduced Graphene Oxide Aerogels

Shu

Zhang

et al. 2020

Adv Elect Materials

110

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Heteroatom nitrogen doping is considered an effective strategy to enhance the electromagnetic wave (EMW) absorption capacity of reduced graphene oxide (RGO). Herein, nitrogen‐doped RGO aerogels (NGAs) are synthesized via hydrothermal self‐assembly followed by lyophilization processes. Results of micromorphology analysis show that the as‐prepared NGAs display unique 3D porous and netlike structure. Moreover, the effects of nitrogen doping and filler contents on EMW absorption properties of NGAs are studied. The as‐synthesized NGA with nitrogen content of 9.41 at% and a bulk density of 8.7 mg cm–3 presents the integrated optimal EMW absorption performance. Specifically, the minimum reflection loss of –56.4 dB is achieved and maximum absorption bandwidth of 6.8 GHz is reached, covering the whole Ku band. In addition, the possible EMW absorption mechanisms of obtained NGAs are proposed. Therefore, the as‐synthesized NGAs can be exploited as promising high‐efficiency and lightweight EMW absorbers.

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Section: Resultssupporting

confidence: 87%

Nitrogen‐Doping‐Regulated Electromagnetic Wave Absorption Properties of Ultralight Three‐Dimensional Porous Reduced Graphene Oxide Aerogels

Shu

Zhang

et al. 2020

Adv Elect Materials

110

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“…Consequently, high‐performance EM wave absorbing materials which have drawn increasing attention are now regarded as an effective strategy to eliminate the EM pollution. Carbon‐based composites, 5‐9 metal‐based composites, 10‐14 polymer‐based composites, 15‐19 and ceramic‐based composites, 20‐24 have been extensively studied for EM wave absorption application. However, applications of carbon, metal, and polymer‐based composites are limited at elevated temperatures due to their degraded strength and EM wave absorption under oxidizing and/or corrosive atmosphere 25 .…”

Section: Introductionmentioning

confidence: 99%

Dielectric response and electromagnetic wave absorption of novel macroporous short carbon fibers/mullite composites

Long

Luo

et al. 2020

J Am Ceram Soc

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Nowadays, electromagnetic (EM) interference and radiation pollution generated from widespread application of electronic devices, could damage the normal function of electronic equipment as well as humanity. 1-4 Consequently, high-performance EM wave absorbing materials which have drawn increasing attention are now regarded as an effective strategy to eliminate the EM pollution. Carbon-based composites, 5-9 metal-based composites, 10-14 polymer-based composites, 15-19 and ceramic-based composites, 20-24 have been extensively studied for EM wave absorption application. However, applications of carbon, metal, and polymer-based composites are limited at elevated temperatures due to their degraded strength and EM wave absorption under oxidizing and/or corrosive atmosphere. 25 Therefore, ceramic-based composites with lightweight, excellent high-temperature strength, and outstanding thermal-chemical stability, are regarded as the most promising candidates of EM wave absorbing materials for high-temperature applications.

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“…The microwave absorption performance depends on the complex permittivity and complex permeability 34‐36 . The real and imaginary parts of the dielectric constant and permeability of the sample are shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Facile synthesis of La‐doped cobalt ferrite@glucose‐based carbon composite as effective multiband microwave absorber

et al. 2021

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C/CoLaxFe2−xO4 (with x = 0.1, 0.2, 0.3) composites were compounded by using a high‐temperature hydrolysis. X‐ray Diffraction (XRD) and X‐ray Photoelectron Spectroscopy (XPS) results show that doping of La ions does not alter the spinel crystal structure and partially replaces Fe ions. Results of Field‐Emission Scanning Electron Microscope (FESEM) and Energy Dispersive Spectroscopy (EDS) mapping prove that with the doping of La ions, the grains are refined, and the carbon shell on the surface exists. The effect of doping of La ions on microwave absorption performance of the composites was systematically studied. It is found that an optimal reflection loss (RL) of −49.56 dB is achieved at 4.96 GHz, as the composition is C/CoLa0.2Fe1.8O4. Meanwhile, the sample C/CoLa0.3Fe1.7O4 shows excellent effective absorption bandwidth. Specifically, when the matching thicknesses are 4 and 5 mm, the effective absorption bandwidth is 4 GHz, covering the C band and Ku band, thus realizing multiband absorption. The synergistic effects of the enhanced dipole polarization related to the doping of La ions, improved interface polarization of the core‐shell structure, and the magnetic loss originated from CoLaxFe2−xO4 are responsible for the optimal microwave absorption performance. Therefore, this C/CoLaxFe2−xO4 composite material has the prospect of a multiband high‐efficiency microwave absorber.

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Hydrothermal synthesis of polyhedral FeCo alloys with enhanced electromagnetic absorption performances

Cited by 69 publications

References 46 publications

Nitrogen‐Doping‐Regulated Electromagnetic Wave Absorption Properties of Ultralight Three‐Dimensional Porous Reduced Graphene Oxide Aerogels

Nitrogen‐Doping‐Regulated Electromagnetic Wave Absorption Properties of Ultralight Three‐Dimensional Porous Reduced Graphene Oxide Aerogels

Dielectric response and electromagnetic wave absorption of novel macroporous short carbon fibers/mullite composites

Facile synthesis of La‐doped cobalt ferrite@glucose‐based carbon composite as effective multiband microwave absorber

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