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Issue 4, 2013
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Laminated magnetic graphene with enhanced electromagnetic wave absorption properties

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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.

Graphical abstract: Laminated magnetic graphene with enhanced electromagnetic wave absorption properties

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Publication details

The article was received on 10 Sep 2012, accepted on 29 Oct 2012 and first published on 30 Oct 2012


Article type: Paper
DOI: 10.1039/C2TC00159D
Citation: J. Mater. Chem. C, 2013,1, 765-777
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    Laminated magnetic graphene with enhanced electromagnetic wave absorption properties

    X. Sun, J. He, G. Li, J. Tang, T. Wang, Y. Guo and H. Xue, J. Mater. Chem. C, 2013, 1, 765
    DOI: 10.1039/C2TC00159D

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