<i>In situ</i> synthesis of hierarchical rose-like porous Fe@C with enhanced electromagnetic wave absorption

Li, Xueai; Du, Daxue; Wang, Chunsheng; Wang, Haiyan; Xu, Zhaopeng

doi:10.1039/c7tc04897a

Cited by 109 publications

(36 citation statements)

References 74 publications

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“…Therefore, the excellent RL value of the Y 2 O 3 /ZrB 2 /CNT material corresponded to the ZrB 2 content (15 wt.%) and the CNT content of 2 wt.%. The loss tangent (tan δ) of the prepared composite samples, which is representative of the power loss in the material with respect to the stored reactive power, was estimated as the ratio between the imaginary and real part of the complex effective permittivity [ 32 , 33 ]. The computed values of tan δ are reported in Figure 4 f. We notice that tan δ, which increased with the contents of ZrB 2 and CNT in the composite, was always greater than Y85 in the whole frequency range for samples Y76, Y78, Y81, and Y83.…”

Section: Resultsmentioning

confidence: 99%

Effects of Multi-Components on the Microwave Absorption and Dielectric Properties of Plasma-Sprayed Carbon Nanotube/Y2O3/ZrB2 Ceramics

Qing

2021

Nanomaterials

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Carbon nanotube (CNT)-reinforced Y2O3/ZrB2 ceramics were fabricated via planetary ball milling and atmospheric-pressure plasma spraying for the first time. The phase composition, micromorphology, and electromagnetic (EM) wave absorption performance of the Y2O3/ZrB2/CNT hybrid was investigated from 8.2 to 12.4 GHz. Both the real and imaginary parts of the complex permittivity were enhanced as the ZrB2 and CNT content increased. The Y2O3/ZrB2/CNT hybrids corresponded to a ZrB2 content of 15 wt.%, and the CNT content was 2 wt.% and showed an exceptional EM wave absorption capability, with a minimum reflection loss of −25.7 dB at 1.9 mm thickness, and the effective absorption band was in a full X-band. These results indicate that an appropriate CNT or ZrB2 content can tune the complex permittivity and absorption performance of the Y2O3/ZrB2/CNT ceramics.

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Section: Resultsmentioning

confidence: 99%

Effects of Multi-Components on the Microwave Absorption and Dielectric Properties of Plasma-Sprayed Carbon Nanotube/Y2O3/ZrB2 Ceramics

Qing

2021

Nanomaterials

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“… 14 In addition, FeCo or FeNi alloys generally exhibit greater permeability, Snoek's limit and higher saturation magnetization than ferrites, which avail the modification and tuning of absorbing properties. 63 …”

Section: Principle Of Mof-derived Pc Absorbersmentioning

confidence: 99%

Recent progress of MOF-derived porous carbon materials for microwave absorption

Tong

et al. 2021

RSC Adv.

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“…Therefore, many researchers focus on improving the waveabsorbing performance by combining ferromagnetic materials with carbon materials [22,23]. For example, Li et al [24] can increase the minimum RL from -22.63 dB before coating to -71.47 dB after coating carbon shell with rose-shaped iron. Thus it can be seen that the absorption materials with different loss types can achieve better absorption performance by combining with each other.…”

Section: Introductionmentioning

confidence: 99%

Optimization design and simulation of a light broadband multilayer composite absorber

Yang

Huang

et al. 2021

J Comput Electron

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Multilayer plate structure is an effective way to design the absorbing coating with excellent performance. Based on the analysis of the electromagnetic (EM) absorbing principle of multilayer structure, this paper selects materials with magnetic loss type and resistance loss type to establish the database of EM parameters. Genetic algorithm is used to optimize the design of the multilayer structure. Finally, COMSOL is used for simulation verification. The results show that the multilayer materials prepared by different types of EM loss materials have the characteristics of large absorption bandwidth and strong absorption capacity. When optimizing for different frequency bands and the thickness is limited to 5 mm, the absorption band can be adjusted freely between 5 GHz and 15 GHz by selecting the materials and thickness of each layer, which solves the limitation that a single material only meet the requirements in a specific frequency band. When optimizing for absorption intensity, the minimum reflection loss (RLmin) can reach -30.7 dB and the effective absorption bandwidth (EAB) is 3.3 GHz (13.1 GHz -16.4 GHz) achieved with only 2.44 mm. This design method provides the possibility to design multilayer composite materials with high absorption and low reflection in a wider frequency band range.

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In situ synthesis of hierarchical rose-like porous Fe@C with enhanced electromagnetic wave absorption

Abstract: The excellent microwave absorption performance of the rose-like porous Fe@C is due to the enhancement of matched impedance and collective multiple loss mechanism.

Cited by 109 publications

References 74 publications

Effects of Multi-Components on the Microwave Absorption and Dielectric Properties of Plasma-Sprayed Carbon Nanotube/Y2O3/ZrB2 Ceramics

Effects of Multi-Components on the Microwave Absorption and Dielectric Properties of Plasma-Sprayed Carbon Nanotube/Y2O3/ZrB2 Ceramics

Recent progress of MOF-derived porous carbon materials for microwave absorption

Optimization design and simulation of a light broadband multilayer composite absorber

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