Graphene@Ni0.5Co0.5Fe2O4 hybrid framework with enhanced interfacial polarization for electromagnetic wave absorption

Wahaab, Fatai Adisa; Yahya, W. A.; Adebayo, Lawal Lanre; Issa, K.; Abdulraheem, Abdulganiyu; Alqasem, Bilal; Yusuf, Jemilat Yetunde; Adekoya, Abibat Asabi; Nyuk, Chai Mui

doi:10.1016/j.jallcom.2020.157259

Cited by 28 publications

(4 citation statements)

References 43 publications

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“…To overcome the problem of EMI, researchers have been working tirelessly to produce effective microwave absorption materials [ 6 , 7 ]. Microwave absorbers (MA) should have significant absorption ability, be lightweight, have wide absorption bandwidth, have a small thickness, have non-laborious, inexpensive cum simple synthesis procedures and have good thermal stability to suit the growing demand for practical applications [ [8] , [9] , [10] ]. Metal powders, metallic oxides, ferrites, and other magnetic materials have all been extensively studied in MA applications.…”

Section: Introductionmentioning

confidence: 99%

In-situ preparation of CoFe2O4 nanoparticles on eggshell membrane-activated carbon for microwave absorption

Soleimani

Yusuf

Chuan

et al. 2023

Heliyon

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Section: Introductionmentioning

confidence: 99%

In-situ preparation of CoFe2O4 nanoparticles on eggshell membrane-activated carbon for microwave absorption

Soleimani

Yusuf

Chuan

et al. 2023

Heliyon

Self Cite

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“…For ε ′ curves in figure 6(a), four samples exhibit the similar tendency, that is, decreasing with increasing frequency. The behavior usually exists in magnetic-dielectric nanocomposites, which is ascribed to the decrease of space charge polarization and the hysteresis of dipole response to EM field [30,31]. Among four samples, CDC/Ni-0 have the biggest averaged ε ′ , ascribed to the enhanced polarization induced by more defects originating from amorphous carbon in CDC/Ni-0.…”

Section: Resultsmentioning

confidence: 99%

What is the important factor affecting microwave absorption performance in corncob-derived carbon/Ni composites?

Li¹,

Li²,

Ying³

et al. 2021

J. Phys. D: Appl. Phys.

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Many factors can affect microwave absorption performance, including impedance matching, attenuation constant, electromagnetic (EM) loss capacity, multi-reflection and scattering and so on. In this work, corncob-derived carbon/Ni composites have been chosen to judge which factor has the greatest influence on the EM absorption behaviors, in which the surface area and pore size have been adjusted by the amount of chemical active additive. Closer impedance matching, larger attenuation constant and stronger EM loss capacity result in the good microwave absorbing behaviors of corncob-derived carbon/Ni composites when the mass ratio of KOH: corncob is 1.5. Minimal reflection loss values can reach −50.25 dB at 12 GHz and the effective bandwidth is 2.24 GHz and reflection loss values start be less than −10 dB at 1.2 mm. Through the analysis of morphology, microstructure, surface area and EM properties, it can be concluded that impedance matching is the most important for obtaining good microwave absorption performances, followed by EM loss ability and attenuation constant, and finally the multi-reflection and scattering by surface area.

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“…This can be attributed to an accelerated periodic variation in the electric field, leading to material polarization and the generation of dipoles that are unable to keep up with these rapid changes [48]. Electric charges tend to accumulate at the contact interfaces, because of the disparate conductivity of MXene and BN, resulting in interfacial polarization when exposed to electromagnetic radiation [49][50][51]. The ε of MXene/BN-251, MXene/BN-201 and MXene/BN-101 varied from 3.47 to 4.86, 4.02 to 5.74 and 3.47 to 4.76 in the frequency range of 0.5-18 GHz.…”

Section: Discussion Of Microwave Absorption Performancementioning

confidence: 99%

Preparation of MXene/BN Composites with Adjustable Microwave Absorption Performance

Zhang,

Wen,

Gou

et al. 2023

Materials

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The challenge of developing a high-efficiency microwave absorbent remains, because of the compatibility between microwave absorption and high-temperature-resistant performance in practical application. Herein, a facile method is used to obtain serial MXene/BN-zxy composites, where zx:y indicates the weight ratio of MXene and boron nitride (BN) in the composites, with adjustable microwave absorption performance (MAP) which can be regulated by the ratio of MXene and the BN nanosheet. In particular, the as-prepared absorbents with supercapacitance-like structure significantly enhanced the MAP and could be served more than 900 °C. The results of MAP reveal that the minimum reflection loss (RL) can reach −20.94 dB with a MXene/BN-101 composite coating thickness of 4.0 mm; the effective attenuation bandwidth (RL< −10 dB, i.e., 90% microwave energy is attenuated) is up to 9.71 GHz (7.94–17.65 GHz). From a detailed analysis, it is observed that attenuation is the critical limiting factor for MAPs rather than impedance mismatch, which can be assigned to the poor MAP of BN nanosheets. In any case, as-prepared absorbents have potential applications in the field of heating components.

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Graphene@Ni0.5Co0.5Fe2O4 hybrid framework with enhanced interfacial polarization for electromagnetic wave absorption

Cited by 28 publications

References 43 publications

In-situ preparation of CoFe2O4 nanoparticles on eggshell membrane-activated carbon for microwave absorption

In-situ preparation of CoFe2O4 nanoparticles on eggshell membrane-activated carbon for microwave absorption

What is the important factor affecting microwave absorption performance in corncob-derived carbon/Ni composites?

Preparation of MXene/BN Composites with Adjustable Microwave Absorption Performance

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