Journal ArticleDOI
Laminated magnetic graphene with enhanced electromagnetic wave absorption properties
Reads0
Chats0
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
More filters
Journal ArticleDOI
Synergistic effect of Fe3O4 anchored N-doped rGO hybrid on mechanical, thermal and electromagnetic shielding properties of epoxy composites
Suman Chhetri,Suman Chhetri,Nitai Chandra Adak,Nitai Chandra Adak,Pranab Samanta,Pranab Samanta,Naresh Chandra Murmu,Naresh Chandra Murmu,Suneel Kumar Srivastava,Tapas Kuila,Tapas Kuila +10 more
TL;DR: In this paper, Fe3O4 nano-particles are anchored over nitrogen doped reduced graphene oxide (Fe 3O4@N-rGO) structure to accommodate electric and magnetic components, so that it could match both the conduction and polarization loss to augment the attenuation of electromagnetic radiation.
Journal ArticleDOI
Morphology and electromagnetic interference shielding effects of SiC coated carbon short fibers
TL;DR: In this paper, the electromagnetic shielding effectiveness of C-SiC/epoxy composites was investigated and compared with that of carbon fiber/polysilicon carbide composites.
Journal ArticleDOI
Synthesis of sandwich microstructured expanded graphite/barium ferrite connected with carbon nanotube composite and its electromagnetic wave absorbing properties
Tingkai Zhao,Wenbo Jin,Xianglin Ji,Huibo Yan,Yuting Jiang,Ying Dong,Yali Yang,Alei Dang,Hao Li,Tiehu Li,Songmin Shang,Zhongfu Zhou +11 more
TL;DR: In this paper, the authors presented a sandwich microstructured expand graphite (EG)/BaFe12O19 (BF) nanocomposite successfully prepared by in-situ sol-gel auto-combustion method.
Journal ArticleDOI
Preparation and evaluation of the microwave absorption properties of template-free graphene foam-supported Ni nanoparticles
TL;DR: In this paper, a template-free graphene foam-supported Ni nanoparticle (GFN) composite was prepared by a hydrothermal method, followed by a calcination process, and the microwave absorption (MA) properties of the samples were also investigated with a vector network analyzer.
Journal ArticleDOI
First-principles calculations of graphene-based polyaniline nano-hybrids for insight of electromagnetic properties and electronic structures
TL;DR: In this article, in situ polymerization between aniline and ammonium persulfate (APS) under acidic conditions is described for the preparation of graphene-based polyaniline hybrids with investigation of their electromagnetic properties.
References
More filters
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.