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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Low-Cost Carbothermal Reduction Preparation of Monodisperse Fe3O4/C Core–Shell Nanosheets for Improved Microwave Absorption
TL;DR: Because of the anisotropy structure and the complementary behavior between Fe3O4 and C, the as-obtained Fe3 O4/C core-shell NSs exhibit strong natural magnetic resonance at a high frequency, enhanced interfacial polarization, and improved impedance matching, ensuring the enhancement of the microwave absorption.
Journal ArticleDOI
Trimetallic FeCoNi@C Nanocomposite Hollow Spheres Derived from Metal–Organic Frameworks with Superior Electromagnetic Wave Absorption Ability
TL;DR: Hollow spheres tri-metallic FeCoNi@C microwave absorbing material via high temperature carbonization were obtained using FeCo Ni-based MOF-74 (FeCoNi-MOF) as the precursor and the effects of different carbonization conditions on the microwave absorption properties of the materials were studied.
Journal ArticleDOI
Experimental demonstration of a transparent graphene millimetre wave absorber with 28% fractional bandwidth at 140 GHz
TL;DR: Optically transparent broadband absorbers operating in the millimetre wave regime achieved by stacking graphene bearing quartz substrates on a ground plate are realized.
Journal ArticleDOI
MnO2 decorated graphene nanoribbons with superior permittivity and excellent microwave shielding properties
Tejendra K. Gupta,Bhanu Pratap Singh,V. N. Singh,Satish Teotia,Avanish Pratap Singh,Indu Elizabeth,Sanjay R. Dhakate,Sundeep Kumar Dhawan,R. B. Mathur +8 more
TL;DR: In this article, the microwave shielding properties of chemically synthesized MnO2 decorated graphene nanoribbons (GNRs) are reported for the first time, where the authors used high-resolution transmission electron microscopy, X-ray diffraction, Raman spectroscopy, and high resolution transmission electron microscope (TEM) to evaluate the shielding performance.
Journal ArticleDOI
Fabrication of ultralight three-dimensional graphene networks with strong electromagnetic wave absorption properties
TL;DR: In this article, thermal reduced graphene networks (TRGNs) with low densities, less than 10 mg cm−3, were synthesized by thermal reduction of graphene oxide/polyvinyl alcohol networks to evaluate the electromagnetic wave absorption properties.
References
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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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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.
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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.