Effects of ordered mesoporous structure and La-doping on the microwave absorbing properties of CoFe2O4

Shang, Tao; Lu, Qingshan; Chao, Luomeng; Qin, Yuliang; Yao, Yun; Yun, Guohong

doi:10.1016/j.apsusc.2017.10.175

Cited by 111 publications

(43 citation statements)

References 37 publications

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“…According to a previous study, the samples with bigger grain sizes possess higher value of M s [ 42 ]. In this work, the relatively high M s value for CoFe 2 O 4 compared with several literatures should be attributed to the big crystalline grain size as confirmed from TEM images [ 43 – 45 ]. For CoFe@C, the M s value is 42.6 emu g − 1 and the H ci is 729.2 Oe.…”

Section: Resultssupporting

confidence: 70%

The Fabrication and High-Efficiency Electromagnetic Wave Absorption Performance of CoFe/C Core–Shell Structured Nanocomposites

Wan

Luo

et al. 2018

Nanoscale Res Lett

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CoFe/C core–shell structured nanocomposites (CoFe@C) have been fabricated through the thermal decomposition of acetylene with CoFe2O4 as precursor. The as-prepared CoFe@C was characterized by X-ray powder diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, transmission electron microscopy, and thermogravimetric analysis. The results demonstrate that the carbon shell in CoFe@C has a poor crystallization with a thickness about 5–30 nm and a content approximately 48.5 wt.%. Due to a good combination between intrinsic magnetic properties and high-electrical conductivity, the CoFe@C exhibits not only excellent absorption intensity but also wide frequency bandwidth. The minimum RL value of CoFe@C can reach − 44 dB at a thickness of 4.0 mm, and RL values below − 10 dB is up to 4.3 GHz at a thickness of 2.5 mm. The present CoFe@C may be a potential candidate for microwave absorption application.Electronic supplementary materialThe online version of this article (10.1186/s11671-018-2474-9) contains supplementary material, which is available to authorized users.

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Section: Resultssupporting

confidence: 70%

The Fabrication and High-Efficiency Electromagnetic Wave Absorption Performance of CoFe/C Core–Shell Structured Nanocomposites

Wan

Luo

et al. 2018

Nanoscale Res Lett

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“…As a result, the precursor’s pore occupancy is very low. Shang et al [117] prepared ordered mesoporous CoFe 2 O 4 by nanocasting method using mesoporous silica SBA-15 as hard-template. For the same purpose, Tian et al [118] used microwave etched mesoporous silica as a template to synthesize a series of mesoporous metal oxides such as Co 3 O 4 , In 2 O 3 , Cr 2 O 3 , Mn 3 O 4 , CuO, NiO, and CeO 2 .…”

Section: Synthetic Methods Of Ordered Mesoporous Metal Oxidesmentioning

confidence: 99%

Designing and Fabricating Ordered Mesoporous Metal Oxides for CO2 Catalytic Conversion: A Review and Prospect

Cui

Lian

et al. 2019

Materials

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In the past two decades, great progress has been made in the aspects of fabrication and application of ordered mesoporous metal oxides. Ordered mesoporous metal oxides have attracted more and more attention due to their large surface areas and pore volumes, unblocked pore structure, and good thermal stabilities. Compared with non-porous metal oxides, the most prominent feature is their ability to interact with molecules not only on their outer surface but also on the large internal surfaces of the material, providing more accessible active sites for the reactants. This review carefully describes the characteristics, classification and synthesis of ordered mesoporous metal oxides in detail. Besides, it also summarizes the catalytic application of ordered mesoporous metal oxides in the field of carbon dioxide conversion and resource utilization, which provides prospective viewpoints to reduce the emission of greenhouse gas and the inhibition of global warming. Although the scope of current review is mainly limited to the ordered mesoporous metal oxides and their application in the field of CO2 catalytic conversion via heterogeneous catalysis processes, we believe that it will provide new insights and viewpoints to the further development of heterogeneous catalytic materials.

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“…At the same time, there are many protrusions on the surface of the fiber, and the density is relatively large and evenly distributed. These large-area protrusions help increase the interfacial effect and strengthen the fiber's ability to absorb EM waves [23]. The uniform distribution of magnetic particles and BN on the surface of the fiber is beneficial in maintaining the stability and improving the oxidation and corrosion resistances of the material.…”

Section: Morphological Analysesmentioning

confidence: 99%

“…We found that CF/1.5FeCoNi/2BN has an electromagnetic wave loss <−10 dB (bandwidth of 15.4 GHz) in the frequency range of 10.6-26 GHz. This is attributed to the fact that when BN is deposited, there is a contact between the fibers and BN, fibers and magnetic particles, and magnetic particles and BN, which creates a large number of interfacial effects and produces more interfacial polarization [23]. In addition, BN is a high-resistance material that can affect the formation of conductive networks and reduce the reflection of EM waves.…”

mentioning

confidence: 99%

Effects of Boron Nitride Coatings at High Temperatures and Electromagnetic Wave Absorption Properties of Carbon Fiber-Based Magnetic Materials

Sun

Cheng

et al. 2020

Journal of Nanomaterials

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An electromagnetic (EM) wave-absorbing material with a three-layer structure is prepared by depositing magnetic particles and a high-temperature resistant coating on the surface of the carbon fiber (CF) with in situ hybridization. Accordingly, the structure, chemical composition, morphology, high-temperature resistance, EM characteristics, and EM wave absorption of the composite materials were analyzed. The composite materials contained CFs, and the magnetic particles, such as Fe3O4, NiFe2O4, CoFe2O4, and Ni3Fe, distributed along the axial direction of the fiber, while boron nitride (BN) existed in the outermost coating layer. This preparation method improves the oxidation resistance and EM wave absorption performance of the CF. When the concentrations of the metal salt solution and the original BN solution are 0.625×1.5 mol L-1 [nFeCl3: nCoSO4: nNiSO4=2:2:1] and 4 mol L-1 [nH3BO3:nCONH22=1:3], respectively, the thermal decomposition temperature of the prepared CF/1.5FeCoNi/2BN is increased from 450°C to 754°C. In the frequency range of 10.6–26 GHz, the EM wave loss is less than −10 dB (the bandwidth spans 15.4 GHz). The CF-based composite material prepared in this study has the characteristics of light weight, wide absorption band, and strong oxidation resistance and constitutes the reference basis for the study of other high-temperature, EM wave-absorbing materials.

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Effects of ordered mesoporous structure and La-doping on the microwave absorbing properties of CoFe2O4

Cited by 111 publications

References 37 publications

The Fabrication and High-Efficiency Electromagnetic Wave Absorption Performance of CoFe/C Core–Shell Structured Nanocomposites

The Fabrication and High-Efficiency Electromagnetic Wave Absorption Performance of CoFe/C Core–Shell Structured Nanocomposites

Designing and Fabricating Ordered Mesoporous Metal Oxides for CO2 Catalytic Conversion: A Review and Prospect

Effects of Boron Nitride Coatings at High Temperatures and Electromagnetic Wave Absorption Properties of Carbon Fiber-Based Magnetic Materials

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