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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Polymer/carbon based composites as electromagnetic interference (EMI) shielding materials
Jean-Michel Thomassin,Christine Jérôme,Thomas Pardoen,Christian Bailly,Isabelle Huynen,Christophe Detrembleur +5 more
TL;DR: A review of the state-of-the-art research in the design and characterization of polymer/carbon based composites as EMI shielding materials can be found in this paper.
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Enhanced microwave absorption property of reduced graphene oxide (RGO)-MnFe2O4 nanocomposites and polyvinylidene fluoride.
Xiao-Juan Zhang,Guang-Sheng Wang,Wen-Qiang Cao,Yun-Zhao Wei,Junfei Liang,Lin Guo,Mao-Sheng Cao +6 more
TL;DR: The results indicated that the RGO/MnFe2O4/PVDF composites show the most excellent wave absorption properties, and the wave absorbing mechanism can be attributed to the dielectric loss, magnetic loss and the synergetic effect between RGO+Mn Fe 2O4, RGO-PV DF and MnFe2 O4+PvDF.
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Multifunctional Organic–Inorganic Hybrid Aerogel for Self‐Cleaning, Heat‐Insulating, and Highly Efficient Microwave Absorbing Material
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Graphene-based microwave absorbing composites: A review and prospective
TL;DR: In this article, the authors introduce the theory of microwave absorption and summarize recent advances in the fabrication of graphene-based MAMs, including rational design of the microstructure of pure graphene and tunable chemical integrations with polymers, magnetic metals, ferrites, ceramics, and multicomponents composites.
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Lightweight, Multifunctional Polyetherimide/Graphene@Fe3O4 Composite Foams for Shielding of Electromagnetic Pollution
TL;DR: This technique is fast, highly reproducible, and scalable, which may facilitate the commercialization of such composite foams and generalize the use of them as EMI shielding materials in the fields of spacecraft and aircraft.
References
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Journal ArticleDOI
Synthesis of Amphiphilic Superparamagnetic Ferrite/Block Copolymer Hollow Submicrospheres
TL;DR: A facile route for preparation of submicrometer ferrite hollow spheres which are amphiphilic and superparamagnetic and exhibit excellent dispersibility in both polar and nonpolar solvents are reported.
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One-step seeding growth of controllable Ag@Ni core–shell nanoparticles on skin collagen fiber with introduction of plant tannin and their application in high-performance microwave absorption
TL;DR: In this paper, a controlable magnetic Ag@Ni core-shell nanoparticles (NPs) have been designed and constructed on the bayberry tannin (BT) grafted skin collagen fiber (SCF) though a simple one-step route.
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Shape-Controlled Growth and Shape-Dependent Cation Site Occupancy of Monodisperse Fe3O4 Nanoparticles
Chien-Hsin Ho,Chih-Pin Tsai,Chia-Chi Chung,Chun-Ying Tsai,Fu-Rong Chen,Hong-Ji Lin,Chih-Huang Lai +6 more
TL;DR: The shape control and formation mechanism of Fe3O4 nanoparticles (NPs) synthesized by a modified hot-injection method were investigated in this article, where shape-induced crystallographic orientation-ordered superlattices were obtained in both cubic and rhombicuboctahedral NPs.
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Hierarchical magnetic yolk–shell microspheres with mixed barium silicate and barium titanium oxide shells for microwave absorption enhancement
TL;DR: In this article, a facile "hydrothermal-assisted crystallization" route for the synthesis of hierarchical magnetic yolk-shell microspheres with mixed barium silicate and barium titanium oxide shells has been developed.
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Structural and electrochemical characterization of ordered mesoporous carbon-reduced graphene oxide nanocomposites
TL;DR: In this paper, the authors proposed a novel theory called Hanger-Bridge theory to explain how mesoporous carbon prevents RGO from agglomerating, and the RGO enhances the conductivity of mesophorous carbon as well as helping to load more Pt particles.