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Laminated magnetic graphene with enhanced electromagnetic wave absorption properties

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TLDR
In this paper, the authors reported a facile solvothermal route to synthesize laminated magnetic graphene and showed that there have significant changes in the electromagnetic properties of magnetic graphene when compared with pure graphene.
Abstract
Graphene is highly desirable as an electromagnetic wave absorber because of its high dielectric loss and low density. Nevertheless, pure graphene is found to be non-magnetic and contributes to microwave energy absorption mostly because of its dielectric loss, and the electromagnetic parameters of pure graphene, which are out of balance, result in a bad impedance matching characteristic. In this paper, we report a facile solvothermal route to synthesize laminated magnetic graphene. The results show that there have been significant changes in the electromagnetic properties of magnetic graphene when compared with pure graphene. Especially the dielectric Cole–Cole semicircle suggests that there are Debye relaxation processes in the laminated magnetic graphene, which prove beneficial to enhance the dielectric loss. We also proposed an electromagnetic complementary theory to explain how laminated magnetic graphene, with the combined advantages of graphene and magnetic particles, helps to improve the standard of impedance matching for electromagnetic wave absorbing materials. Besides, microwave absorption properties indicate that the reflection loss of the as-prepared composite is below −10 dB (90% absorption) at 10.4–13.2 GHz with a coating layer thickness of 2.0 mm. This further confirms that the nanoscale surface modification of magnetic particles on graphene makes graphene-based composites have a certain research value in electromagnetic wave absorption.

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Citations
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Synthesis of lightweight, hierarchical cabbage-like composites as superior electromagnetic wave absorbent

TL;DR: In this article, a three-dimensional hierarchical cabbage-like carbonaceous materials (Fe/CCMs- X, X means treating temperature) have been successfully prepared employing combinatorial processes of cobalt-assisted hydrothermal carbonization (HTC) of furfural and subsequent iron salt impregnation and thermal treatment.
Journal ArticleDOI

Synthesis of MoS2-reduced graphene oxide/Fe3O4 nanocomposite for enhanced electromagnetic interference shielding effectiveness

TL;DR: In this article, a facile two-step hydrothermal process for the synthesis of MoS2-reduced graphene oxide/Fe3O4 (MoS 2-rGO/Fe 3O4) nanocomposite and its application as an excellent electromagnetic interference shielding material was presented.
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Preparation and characterization of TiO2–Graphene@Fe3O4 magnetic composite and its application in the removal of trace amounts of microcystin-LR

TL;DR: In this paper, a ternary composite of TiO2-coated magnetic graphene was used as an adsorbent and photocatalyst to efficiently remove microcystin-LR (MC-LR) from water.
Journal ArticleDOI

Effects of three-dimensional reduced graphene oxide coupled with nickel nanoparticles on the microwave absorption of carbon fiber-based composites

TL;DR: In this paper, two-dimensional RGO interfaces were introduced into the one-dimensional carbon fiber (CF) networks for synthesizing a three-dimensional Carbon fiber/reduced graphene oxide (CF-RGO) composite textile.
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Enhanced microwave absorption properties in C band of Ni/C porous nanofibers prepared by electrospinning

TL;DR: In this paper, the authors show that NiCPNFs with a diameter of 300nm have numerous different size pores and that NiNPs are evenly embedded in porous carbon nanofibers.
References
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Journal ArticleDOI

Raman Spectrum of Graphite

TL;DR: Raman spectra are reported from single crystals of graphite and other graphite materials as mentioned in this paper, and the Raman intensity of this band is inversely proportional to the crystallite size and is caused by a breakdown of the k-selection rule.
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Detection of individual gas molecules adsorbed on graphene

TL;DR: In this paper, it was shown that micrometre-size sensors made from graphene are capable of detecting individual events when a gas molecule attaches to or detaches from graphene's surface.
Journal ArticleDOI

Shape-Controlled Synthesis of Gold and Silver Nanoparticles

TL;DR: Monodisperse samples of silver nanocubes were synthesized in large quantities by reducing silver nitrate with ethylene glycol in the presence of poly(vinyl pyrrolidone) (PVP), characterized by a slightly truncated shape bounded by {100, {110}, and {111} facets.
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Detection of Individual Gas Molecules Absorbed on Graphene

TL;DR: In this paper, it was shown that micrometre-size sensors made from graphene are capable of detecting individual events when a gas molecule attaches to or detaches from graphenes surface.
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