Journal ArticleDOI
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.read more
Citations
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Waxberry-like carbon@polyaniline microspheres with high-performance microwave absorption
Lujun Yu,Yaofeng Zhu,Yaqin Fu +2 more
TL;DR: The as-synthesized carbon@polyaniline nanorod arrays microspheres (C@PANI) as mentioned in this paper show specific waxberry-like shape, and exhibit superior microwave absorption capacities compared with pure PANI and carbon microsphere.
Journal ArticleDOI
Self-assembled reduced graphene oxide/nickel nanofibers with hierarchical core-shell structure for enhanced electromagnetic wave absorption
TL;DR: In this paper, a 3D reduced graphene oxide/nickel (rGO/Ni) nanofiber with hierarchical core-shell structure and vertically aligned graphene edge planes is synthesized as an efficient microwave absorption material.
Journal ArticleDOI
Sandwich-like graphene nanosheets decorated with superparamagnetic CoFe2O4 nanocrystals and their application as an enhanced electromagnetic wave absorber
TL;DR: In this article, a sandwich-like CoFe2O4/graphene hybrid is fabricated through a facile one-pot polyol route, and the electromagnetic wave absorption properties are investigated.
Journal ArticleDOI
Sandwich structures of graphene@Fe3O4@PANI decorated with TiO2 nanosheets for enhanced electromagnetic wave absorption properties
TL;DR: In this paper, the structure and morphology of the nanocomposites were characterized by X-ray diffraction, transmission electron microscopy, and field-emission scanning electron microscope.
Journal ArticleDOI
Graphene-enhanced microwave absorption properties of Fe3O4/SiO2 nanorods
TL;DR: In this article, a facile wet chemical method was used to synthesize a Fe 3 O 4 /SiO 2 /graphene composite composed of core-shell nanorods and graphene nanosheets.
References
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Raman Spectrum of Graphite
F. Tuinstra,J. L. Koenig +1 more
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.
Journal ArticleDOI
Detection of individual gas molecules adsorbed on graphene
Fred Schedin,A. K. Geim,Sergey V. Morozov,Ernie W. Hill,Peter Blake,Mikhail I. Katsnelson,K. S. Novoselov +6 more
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
Yugang Sun,Younan Xia +1 more
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.
Journal ArticleDOI
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.