Heterostructure design of Ni/C/porous carbon nanosheet composite for enhancing the electromagnetic wave absorption

Di, Xiaochuang; Wang, Yan; Lu, Zhao; Cheng, Runrun; Yang, Lei; Wu, Xiaofeng

doi:10.1016/j.carbon.2021.04.050

Cited by 170 publications

(32 citation statements)

References 62 publications

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“…Debye dipole relaxation is introduced to illustrate the polarization relaxation, which can be clarified by the correspondence between ε′ and ε″, and the relationship is shown as follows: …”

Section: Resultsmentioning

confidence: 99%

N-Doped Carbon Fibers with Embedded ZnFe and Fe₃C Nanoparticles for Microwave Absorption

Guo

Zou

et al. 2021

ACS Appl. Nano Mater.

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Microwave absorbing materials (MAMs) play a vital role in the field of electromagnetic wave pollution protection. Herein, multiple interfacial ZnFe/Fe 3 C@C porous nanofibers as a microwave absorber were prepared by electrospinning and subsequent thermal treatment. The elaborately designed ingredients and porous feature of the structure introduce good impedance matching. The multiple interfacial heterojunction structure and the self-doping of nitrogen atoms of the proposed carbon-based magnetic fibers promote dielectric polarization relaxation. Moreover, the attenuation capacity and impedance matching can be adjusted by the carbothermal temperature. The obtained composites exhibit excellent microwave absorption performance, which possess a minimum reflection loss of −33.57 dB at 13.92 GHz and an effective absorption bandwidth (RL < −10 dB) of 4.16 GHz. These favorable characteristics and excellent performance of ZnFe/Fe 3 C@C porous nanofibers can promote the development of an efficient, lightweight microwave absorber.

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Section: Resultsmentioning

confidence: 99%

N-Doped Carbon Fibers with Embedded ZnFe and Fe₃C Nanoparticles for Microwave Absorption

Guo

Zou

et al. 2021

ACS Appl. Nano Mater.

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“…[6] Therefore, reasonable structure of magnetic and dielectric components in composite materials is of great significance for optimizing electromagnetic properties and improving microwave absorption (MA) performance. [7][8][9] In recent years, magnetic carbon composites have attracted much attention owing to their combined advantages of magnetic nanoparticles and carbon components. [10] Wang et al successfully fabricate a series of core-shell FeCo@C nanoparticles and encapsulated carbon nanocage composite materials by using FeCo Prussian blue analogs as nucleation points and polymerizing dopamine on their surfaces.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic Carbon Composites Derived from Coal Hydrogasification Residue for Microwave Absorption

Mao

Liang

et al. 2022

Physica Status Solidi (a)

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To cut the cost of microwave absorption materials (MAMs) and achieve the recycling of semicoke (SC), the by‐product in coal hydrogasification process, SC was applied to prepare composite MAMs. The facile synthesis process involves liquid‐phase impregnation, and then in situ carbothermal reduction treatment. Champion sample prepared under 800 °C (FeSC800) exhibits the minimum reflection loss (RLmin) of −39.3 dB under a coating thickness of 2.5 mm, and the effective absorption bandwidth (EAB) can reach 3.9 GHz (14.1–18 GHz) at a coating thickness of 1.5 mm. The enhancement of interfacial and dipole polarization, as well as the synergistic effect between the dielectric properties of SC matrix and the magnetic properties of Fe particles, can account for the excellent microwave absorption (MA) performance. In view of the source of SC matrix, the prepared FeSC800 was not only expected to become a candidate in the field of MAMs, but also presented a promising approach for the resource utilization of SC.

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“…In particular, 3D interconnected structures with open pores have shown good EMW absorption properties owing to their large surface area and abundant edge sites for improving the polarization loss as well as numerous pores for optimizing impedance matching properties [13][14][15]. Up to now, various 3D interconnected structures with open pores have been prepared for EMW absorption [16][17][18]. However, these 3D interconnected structures with open pores frequently contain functional zero-and/or one-dimensional nanostructures with a relatively large size, leading to a higher filler ratio in the matrix.…”

Section: Introductionmentioning

confidence: 99%

Identification of the Intrinsic Dielectric Properties of Metal Single Atoms for Electromagnetic Wave Absorption

et al. 2021

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Atomically dispersed metals on N-doped carbon supports (M–NxCs) have great potential applications in various fields. However, a precise understanding of the definitive relationship between the configuration of metal single atoms and the dielectric loss properties of M–NxCs at the atomic-level is still lacking. Herein, we report a general approach to synthesize a series of three-dimensional (3D) honeycomb-like M–NxC (M = Mn, Fe, Co, Cu, or Ni) containing metal single atoms. Experimental results indicate that 3D M–NxCs exhibit a greatly enhanced dielectric loss compared with that of the NC matrix. Theoretical calculations demonstrate that the density of states of the d orbitals near the Fermi level is significantly increased and additional electrical dipoles are induced due to the destruction of the symmetry of the local microstructure, which enhances conductive loss and dipolar polarization loss of 3D M–NxCs, respectively. Consequently, these 3D M–NxCs exhibit excellent electromagnetic wave absorption properties, outperforming the most commonly reported absorbers. This study systematically explains the mechanism of dielectric loss at the atomic level for the first time and is of significance to the rational design of high-efficiency electromagnetic wave absorbing materials containing metal single atoms.

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Heterostructure design of Ni/C/porous carbon nanosheet composite for enhancing the electromagnetic wave absorption

Cited by 170 publications

References 62 publications

N-Doped Carbon Fibers with Embedded ZnFe and Fe₃C Nanoparticles for Microwave Absorption

N-Doped Carbon Fibers with Embedded ZnFe and Fe₃C Nanoparticles for Microwave Absorption

Magnetic Carbon Composites Derived from Coal Hydrogasification Residue for Microwave Absorption

Identification of the Intrinsic Dielectric Properties of Metal Single Atoms for Electromagnetic Wave Absorption

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Heterostructure design of Ni/C/porous carbon nanosheet composite for enhancing the electromagnetic wave absorption

Cited by 170 publications

References 62 publications

N-Doped Carbon Fibers with Embedded ZnFe and Fe3C Nanoparticles for Microwave Absorption

N-Doped Carbon Fibers with Embedded ZnFe and Fe3C Nanoparticles for Microwave Absorption

Magnetic Carbon Composites Derived from Coal Hydrogasification Residue for Microwave Absorption

Identification of the Intrinsic Dielectric Properties of Metal Single Atoms for Electromagnetic Wave Absorption

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Product

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N-Doped Carbon Fibers with Embedded ZnFe and Fe₃C Nanoparticles for Microwave Absorption

N-Doped Carbon Fibers with Embedded ZnFe and Fe₃C Nanoparticles for Microwave Absorption