Journal Article10.1039/C2TC00159D
Laminated magnetic graphene with enhanced electromagnetic wave absorption properties
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TL;DR: 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.
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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.
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Citations
Enhanced electromagnetic wave absorption performance of silane coupling agent KH550@Fe3O4 hollow nanospheres/graphene composites
Xiangfeng Shu,Hengdong Ren,Yu Jiang,Jun Zhou,Yueqin Wang,Yanfen Wang,Yin Liu,Won-Chun Oh,Won-Chun Oh +8 more
TL;DR: In this paper, a silane coupling agent was used as a surface modifier for Fe3O4 to increase the hydrophobicity of hollow nanospheres to improve their dispersion and adhesion.
76
Solvothermal synthesis of three-dimensional, Fe2O3 NPs-embedded CNT/N-doped graphene composites with excellent microwave absorption performance
TL;DR: In this article, a new three-dimensional magnetic composite, namely carbon nanotubes (CNTs)-intercalated nitrogen-doped graphene (N-GN) embedded with Fe2O3 NPs, were fabricated by a solvothermal method for use as synergistic microwave absorbers.
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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.
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Ultra-efficient electromagnetic wave absorption with ethanol-thermally treated two-dimensional Nb2CTx nanosheets
Zhaoyong Jin,Yanfeng Fang,Xiaoxia Wang,Gengfang Xu,Mengli Liu,Shuang Wei,Congli Zhou,Yanlin Zhang,Yuanhong Xu +8 more
TL;DR: The absorption performance of the as-treated Nb2CTx nanosheets could be significantly improved, while the ones in ethanol showed much more superior absorption capability, especially in the low-frequency band.
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References
Preparation of graphitic acid
Abstract: The preparation of graphitic oxide by methods described in the literature is time consuming and hazardous. A rapid, relatively safe method has been developed for preparing graphitic oxide from graphite in what is essentially an anhydrous mixture of sulfuric acid, sodium nitrate and potassium permanganate.
27.5K
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.
10.4K
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.
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.
6.4K
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.
5.5K