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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Facile preparation of lightweight PE/PVDF/Fe3O4/CNTs nanocomposite foams with high conductivity for efficient electromagnetic interference shielding
Zhao Yishen,Junji Hou,Zhongyi Bai,Yang Yang,Xiaoqin Guo,Haoran Cheng,Zongshen Zhao,Xiaoli Zhang,Jingbo Chen,Changyu Shen +9 more
TL;DR: In this paper, a light-weight polyethylene/polyvinylidene fluoride/Fe3O4/Carbon nanotubes (PE/PVDF/Fe4/CNTs) nanocomposite foams with efficient electromagnetic interference (EMI) shielding performance were prepared using green processing methods of melt blending and supercritical CO2 foaming.
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Stretchable polyurethane composite foam triboelectric nanogenerator with tunable microwave absorption properties at elevated temperature
TL;DR: In this article, a stretchable composite foam-based triboelectric nanogenerator (CF-TENG) with tunable microwave absorption (MA) capacity was developed by assembling self-foaming polyurethane (PU), tadpole-like CNTs@Fe3O4 nanoparticles (NPs) and conductive wires.
Journal ArticleDOI
Synthesis and remarkable microwave absorption properties of amine-functionalized magnetite/graphene oxide nanocomposites
TL;DR: In this article, a co-precipitation method was used to prepare magnetite nanoparticles and functionalize them by amine groups prior to hybridization with graphene oxide.
Journal ArticleDOI
High-efficiency microwave absorbing performance originating from sufficient magnetic exchange coupling interaction and impressive dielectric loss
Gang Fang,Chuyang Liu,Chuyang Liu,Yun Yang,Kangsen Peng,Yufan Cao,Guoyue Xu,Yujing Zhang,Yujing Zhang +8 more
TL;DR: In this article, the authors used exchange-coupled hard-soft magnets as promising microwave absorbers, but it is difficult to make further breakthrough in microwave absorption performance due to the deficient dielectric loss.
Journal ArticleDOI
γ-irradiation induced one-step synthesis of electromagnetic functionalized reduced graphene oxide–Ni nanocomposites
Hongtao Zhao,Hongtao Zhao,Hongtao Zhao,Zhigang Li,Zhigang Li,Nan Zhang,Nan Zhang,Yunchen Du,Siwei Li,Lin Shao,Deyu Gao,Xijiang Han,Ping Xu +12 more
TL;DR: In this paper, a facile one-step synthesis of RGO-Ni hybrid materials was demonstrated, where Ni2+ ions and GO are simultaneously reduced by γ-irradiation.
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.