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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Strong and thermostable polymeric graphene/silica textile for lightweight practical microwave absorption composites
Wei-Li Song,Xiao-Tian Guan,Li-Zhen Fan,Yi-Bo Zhao,Wen-Qiang Cao,Chan-Yuan Wang,Mao-Sheng Cao +6 more
TL;DR: In this paper, a novel strategy to fabricate strong and thermostable polymeric graphene/silica textile composites for practical microwave absorption applications is proposed, where a unique silica textile coupled with freeze-drying method is employed as the critical factor in the formation of the polymeric composites.
Journal ArticleDOI
Ultrathin high-performance electromagnetic wave absorbers with facilely fabricated hierarchical porous Co/C crabapples
Nannan Wu,Nannan Wu,Chang Liu,Dongmei Xu,Jiurong Liu,Wei Liu,Hu Liu,Hu Liu,Jiaoxia Zhang,Jiaoxia Zhang,Wei Xie,Zhanhu Guo +11 more
TL;DR: In this paper, the hierarchical porous cobalt (Co)/carbon (C) crabapples, lab-made via a facile solvothermal reaction coupled with a following carbon reduction treatment, provided 90% EMW absorption over a broad bandwidth of 5.9 GHz at 2.0 mm thickness.
Journal ArticleDOI
MOF-derived porous hollow Ni/C composites with optimized impedance matching as lightweight microwave absorption materials
TL;DR: In this article, the authors reported the successful fabrication of Ni/C composites by adopting the MOF-derived method, which delivered porous and hollow structures with diameters of 1.0-2.0μm.
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Graphene-Based Materials toward Microwave and Terahertz Absorbing Stealth Technologies
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Multifunctional broadband microwave absorption of flexible graphene composites
TL;DR: In this paper, a flexible broadband microwave absorber with self-recoverability was fabricated by self-assembling graphene sheets into polypropylene 3D framework, which has a full-band absorption (more than 90%) in the working ranges of microwave communication and detection in military radars.
References
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Raman Spectrum of Graphite
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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.
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.