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Excellent Microwave Absorption Property of h-BN-GO-Fe3O4 Ternary Composite

Abstract

Ternary composite of hexagonal boron nitride nanoplates-graphene oxide-Fe3O4 microplate (h-BN-GO-Fe3O4) as a novel type of electromagnetic (EM) microwave absorbing materials was synthesized via a facile and efficient strategy. The composite has layered microstructure with interlayer voids. The GO layers and h-BN nanoplates can significantly reduce the aggregation of the Fe3O4 microplates to reduce the conductivity. The overlapped Fe3O4 microplates and the embedded h-BN nanoplates result in voids which further increase the resistivity of the material and suppress eddy current effectively. The hierarchically multicomponent structure is in favor of improving the impedance matching and resulting in excellent EM microwave absorbing performance. The effective absorption bandwidth (RL < −10 dB) achieves 12.2 GHz when the absorber thicknesses ranges from 2.0 to 5.0 mm. The EM microwave absorption mechanism of the composite is discussed using complex thickness model and quarter-wavelength cancellation theory. It is found that the remarkable microwave absorption performances can be ascribed as the joint outcome of the interfacial cancellation of the incident and reflect EM microwave at the air- material interface and the dissipation of microwave via magnetic loss, multiple reflection and scattering in the material. This research demonstrates void containing composites as an efficient approach for fabricating broad-bandwidth, and efficient EM microwave absorbers.

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Publication details

The article was received on 20 Jul 2018, accepted on 07 Oct 2018 and first published on 09 Oct 2018


Article type: Paper
DOI: 10.1039/C8TC03582B
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Excellent Microwave Absorption Property of h-BN-GO-Fe3O4 Ternary Composite

    W. Pang, H. Pang, B. Zhang and N. Ren , J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC03582B

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