Solvothermal synthesis and good microwave absorbing properties for magnetic porous-Fe3O4/graphene nanocomposites

Zeng, Xiaojun; Yang, Bai; Yang, Haozhe; Zhu, Lingyu; Yu, Rong

doi:10.1063/1.4973209

Cited by 20 publications

(4 citation statements)

References 29 publications

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“…Low-dimensional carbon matrix magnetic nanocomposites are a kind of desired electromagnetic wave absorption materials with the merits of lightweight and strong absorption. [6][7][8][9] On the one hand, the high specific surface area of low-dimensional carbon-based materials endows them with light weight and the possibility of multiple interface polarization, which are conducive to the improvement of dielectric loss. [10][11][12] On the other hand, the introduction of magnetic nanoparticles is beneficial for the formation of multiple loss abilities and optimized impedance matching considering the synergy effect of dielectric loss and magnetic loss.…”

Section: Introductionmentioning

confidence: 99%

Improvement of multiple attenuation characteristics of two-dimensional lamellar ferrocobalt@carbon nanocomposites as excellent electromagnetic wave absorbers

Pan

et al. 2022

Dalton Trans.

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Section: Introductionmentioning

confidence: 99%

Improvement of multiple attenuation characteristics of two-dimensional lamellar ferrocobalt@carbon nanocomposites as excellent electromagnetic wave absorbers

Pan

et al. 2022

Dalton Trans.

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“…Graphenic is a single sheet consisting of carbon atoms forming a hexagonal bonding. Graphene and its derivates can be applied as RAM because of its extraordinary physical and chemical properties, such as superior electrical conductivity, large surface area, and excellent structural flexibility [7][8][9][10][11]. At present, research on the synthesis of rGO, such as carbon compounds from old coconut shells, has been widely developed because rGO is a derivative of graphene materials [12,13].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Thickness Optimization of Graphenic-Based Carbon Material as a Microwave Absorber

et al. 2022

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The purpose of this study is to optimize the thickness of a layered graphenic-based carbon compound, which is a non-magnetic material derived from biomass (old coconut shell). After the sample was exfoliated using HCl solution, the morphological structure showed that the material used in this study is a reduced graphene oxide (rGO), similar to carbon but with a thickness of less than 10 nm and lateral size in submicron (100 nm). The sample with a 2 mm thickness was then characterized using a vector network analyzer (VNA) to measure its reflection loss (RL). The measurement result is evaluated by converting the S-parameter values (S11 and S21) from the VNA using the Nicolsson Ross Weir (NRW) method to obtain input variables such as relative complex permeability and relative complex permittivity. Following this, the single-layer thickness of the sample was optimized using a genetic algorithm (GA), which can predict the appropriate thickness so that the optimum RL can be obtained. The optimum thickness of the sample was found to be 3.48 mm, which resulted in a much higher RL. The RL was re-measured for verification using a sample with the corresponding optimized thickness, revealing that this optimization is feasibly operational for a radar absorbing material (RAM) design. HIGHLIGHTS Carbon compounds containing graphenic phase derived from coconut shell are functional materials having various unique properties such as superior electrical conductivity, large surface area, and excellent structural flexibility, and microwave absorbtion The single-layer microwave absorber employing carbon compounds has been prepared The layer thickness optimized using a genetic algorithm (GA) can estimate the appropriate design with the maximum reflection loss (RL)

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“…Graphene, a one-atom-thick closely packed 2D carbonaceous material, has been reported to show promising application as EM absorbents due to its lightweight, high specific surface area, and abundant defects. [15][16][17][18] Without magnetic loss, dielectric loss would be the only mechanism. However, both the strength and bandwidth of EM absorption need to be further improved.…”

Section: Introductionmentioning

confidence: 99%

“…Ferrite is a typical magnetic MAM with easy preparation, strong absorption properties, and low cost. [24][25][26][27] Although porous Fe 3 O 4 , [15] bowl-like Fe 3 O 4 hollow spheres, [28] and hierarchical CoFe 2 O 4 [29] have been prepared and formed composite for EM wave absorbents, study on Fe 3 O 4 flakes is rather limited. As the Fe 3 O 4 flakes and graphene are 2D materials, abundant interface and large interfacial polarization would be obtained.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Microwave Absorption: The Composite of Fe₃O₄ Flakes and Reduced Graphene Oxide with Improved Interfacial Polarization

Jiao

et al. 2020

Adv Eng Mater

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Herein, to further improve the microwave absorption performance, the composite of Fe 3 O 4 flakes and reduced graphene oxide (RGO/Fe 3 O 4) via hydrothermal method followed by H 2 reduction is rationally designed and synthesized. Compared with pure Fe 3 O 4 flakes and RGO/granular Fe 3 O 4 composite, the obtained RGO/Fe 3 O 4 exhibit remarkable enhancement of microwave absorption. The measurement results indicate that the maximum reflection loss of RGO/ Fe 3 O 4 can reach À47.2 dB at the thickness of 2.4 mm and the effective absorption bandwidth less than À10 dB reaches 6.4 GHz (from 11.36 to 17.76 GHz), much higher than that of pure Fe 3 O 4 flakes and RGO/granular Fe 3 O 4 composite. The improved performances are believed to be from the rationally designed heterointerfaces, which are created by the combination of Fe 3 O 4 flakes and graphene. The construction of abundant heterointerfaces is a valid strategy to improve the microwave absorption performance.

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Solvothermal synthesis and good microwave absorbing properties for magnetic porous-Fe3O4/graphene nanocomposites

Cited by 20 publications

References 29 publications

Improvement of multiple attenuation characteristics of two-dimensional lamellar ferrocobalt@carbon nanocomposites as excellent electromagnetic wave absorbers

Improvement of multiple attenuation characteristics of two-dimensional lamellar ferrocobalt@carbon nanocomposites as excellent electromagnetic wave absorbers

Preparation and Thickness Optimization of Graphenic-Based Carbon Material as a Microwave Absorber

Enhanced Microwave Absorption: The Composite of Fe₃O₄ Flakes and Reduced Graphene Oxide with Improved Interfacial Polarization

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Solvothermal synthesis and good microwave absorbing properties for magnetic porous-Fe3O4/graphene nanocomposites

Cited by 20 publications

References 29 publications

Improvement of multiple attenuation characteristics of two-dimensional lamellar ferrocobalt@carbon nanocomposites as excellent electromagnetic wave absorbers

Improvement of multiple attenuation characteristics of two-dimensional lamellar ferrocobalt@carbon nanocomposites as excellent electromagnetic wave absorbers

Preparation and Thickness Optimization of Graphenic-Based Carbon Material as a Microwave Absorber

Enhanced Microwave Absorption: The Composite of Fe3O4 Flakes and Reduced Graphene Oxide with Improved Interfacial Polarization

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Enhanced Microwave Absorption: The Composite of Fe₃O₄ Flakes and Reduced Graphene Oxide with Improved Interfacial Polarization