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
Hydrothermal synthesis of reduced graphene oxide–Co3O4 composites and the excellent microwave electromagnetic properties
TL;DR: In this paper, reduced graphene oxide-Co3O4 composites were synthesized by a simple hydrothermal method and the electromagnetic and microwave absorbing properties of RGO-CoO4 were investigated for the first time.
Journal ArticleDOI
Three-dimensional reduced graphene oxide powder for efficient microwave absorption in the S-band (2–4 GHz)
TL;DR: In this article, three-dimensional reduced graphene oxide (3D-rGO) powders were prepared by using a hydrothermal method and subsequent thermal treatment to enhance the electromagnetic wave attenuation in 2-4 GHz.
Journal ArticleDOI
Microwave absorption on a bare biomass derived holey silica-hybridized carbon absorbent
TL;DR: In this article, a rice husk-derived silica-hybridized holey carbon fabricated by combining pyrolysis and plasma processing methods is active for the microwave absorbing, and the obtained metal-free product is barely prepared from wasted biomass without any additive reagents addition.
Journal ArticleDOI
Recent progress in SiC nanowires as electromagnetic microwaves absorbing materials
TL;DR: In this paper, the absorbing mechanism of 1D SiC nanomaterials with different microstructures is introduced and the major influence factors including defects, surface, network structure, thickness and temperature are further discussed.
Journal ArticleDOI
Electromagnetic Field Absorbing Polypropylene Nanocomposites with Tuned Permittivity and Permeability by Nanoiron and Carbon Nanotubes
Qingliang He,Tingting Yuan,Xi Zhang,Xingru Yan,Jiang Guo,Daowei Ding,Mojammel A. Khan,David P. Young,Airat Khasanov,Zhiping Luo,Jiurong Liu,Tongde Shen,Xinyu Liu,Suying Wei,Zhanhu Guo +14 more
TL;DR: In this article, a magnetic polymer nanocomposites (MPNCs) with in-situ synthesized Fe@Fe2O3 core@shell nanoparticles (NPs) or their decorated multiwall carbon nanotubes (MWNTs) dispersed in the polypropylene (PP) matrix through a one-pot bottom-up method was reported.
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.