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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Wood-based straightway channel structure for high performance microwave absorption
TL;DR: In this paper, the authors designed a high-performance porous biomass-pyrolized carbon (PBPC) based on natural wood for microwave absorption, which showed excellent microwave absorption performance with maximum reflection loss (RL) of −68.3 dB and absorption bandwidth (RL −10 dB) up to 7.63 GHz.
Journal ArticleDOI
Barium ferrite decorated reduced graphene oxide nanocomposite for effective electromagnetic interference shielding
Meenakshi Verma,Avanish Pratap Singh,Pradeep Sambyal,Bhanu Pratap Singh,Sundeep Kumar Dhawan,Veena Choudhary +5 more
TL;DR: The results suggested that the as-prepared BaFe12O19@RGO nanocomposite showed great potential as an effective candidate for a new type of microwave absorbing material.
Journal ArticleDOI
Magnetic graphene for microwave absorbing application: Towards the lightest graphene-based absorber
TL;DR: In this article, the Nitrogen-doped graphene (NG) was synthesized by a facile hydrothermal method with graphene oxide (GO) and urea as precursors.
Journal ArticleDOI
A review of three-dimensional graphene-based aerogels: Synthesis, structure and application for microwave absorption
TL;DR: In this paper, the latest advances in the synthetic strategies and structural characteristics of graphene-based materials are reviewed, including pure GAs and hybrid aerogels with other lossy materials, and also highlighted the multifunctional microwave absorbing materials.
Journal ArticleDOI
Hydrophobic graphene nanosheets decorated by monodispersed superparamagnetic Fe3O4 nanocrystals as synergistic electromagnetic wave absorbers
TL;DR: In this paper, a facile in situ thermal decomposition route for the fabrication of superparamagnetic Fe3O4 nanocrystals anchored on hydrophobic graphene nanosheets as synergistic electromagnetic wave absorbers is reported.
References
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Journal ArticleDOI
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.