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Nano Research 2018, 11(5): 2689-2704 https://doi.org/10.1007/s12274-017-1899-2
Research Article | Issue | Published: 12 May 2018

Enhanced microwave absorption performance of highly dispersed CoNi nanostructures arrayed on graphene

Show Author's Information Genban Sun1,2,  Hong Wu2,  Qingliang Liao1( ),  Yue Zhang1( )
State Key Laboratory for Advanced Metals and MaterialsSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing100083China
Beijing Key Laboratory of Energy Conversion and Storage Materials and College of ChemistryBeijing Normal UniversityBeijing100875China
Keywords:
nanoclusters, microwave absorption, alloy, CoNi/graphene nanocomposites, electromagnetism
Cite this article:
Sun G, Wu H, Liao Q, et al. Enhanced microwave absorption performance of highly dispersed CoNi nanostructures arrayed on graphene. Nano Research, 2018, 11(5): 2689-2704. https://doi.org/10.1007/s12274-017-1899-2
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Abstract Full text Electronic supplementary material About this article

Magnetic metals (Fe, Co, Ni) and alloys thereof are easily synthesized as nanoparticles, but obtaining highly dispersed graphene-based magnetic nanomaterials remains challenging. Here, three CoNi/graphene nanocomposites (CoNi/GN) are successfully assembled for the first time via a one-pot strategy without templating by manipulating the reaction time and solvents used for the same precursors. Moreover, the reduction of graphene oxide utilizing this method is more effective than that by conventional methods and the alloy particles are firmly embedded on the GN substrate. Compared to n- and p-CoNi/GN nanocomposites, o-CoNi/GN nanocomposites show the best electromagnetic wave absorption properties with the maximum reflection loss of-31.0 dB at 4.9 GHz for a thickness of 4 mm; the effective absorption bandwidth (< 10.0 dB) is 7.3 GHz (9.5–16.8 GHz) for a thickness of 2 mm. The structures and electromagnetic wave absorption mechanisms of the three composites were also investigated. This research provides a new platform for the development of magnetic alloy nanoparticles in the field of microwave-absorbing devices.


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About this article

Enhanced microwave absorption performance of highly dispersed CoNi nanostructures arrayed on graphene

Show Author's information Genban Sun1,2, Hong Wu2, Qingliang Liao1( ), Yue Zhang1( )
State Key Laboratory for Advanced Metals and MaterialsSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing100083China
Beijing Key Laboratory of Energy Conversion and Storage Materials and College of ChemistryBeijing Normal UniversityBeijing100875China

Abstract

Magnetic metals (Fe, Co, Ni) and alloys thereof are easily synthesized as nanoparticles, but obtaining highly dispersed graphene-based magnetic nanomaterials remains challenging. Here, three CoNi/graphene nanocomposites (CoNi/GN) are successfully assembled for the first time via a one-pot strategy without templating by manipulating the reaction time and solvents used for the same precursors. Moreover, the reduction of graphene oxide utilizing this method is more effective than that by conventional methods and the alloy particles are firmly embedded on the GN substrate. Compared to n- and p-CoNi/GN nanocomposites, o-CoNi/GN nanocomposites show the best electromagnetic wave absorption properties with the maximum reflection loss of-31.0 dB at 4.9 GHz for a thickness of 4 mm; the effective absorption bandwidth (< 10.0 dB) is 7.3 GHz (9.5–16.8 GHz) for a thickness of 2 mm. The structures and electromagnetic wave absorption mechanisms of the three composites were also investigated. This research provides a new platform for the development of magnetic alloy nanoparticles in the field of microwave-absorbing devices.

Keywords: nanoclusters, microwave absorption, alloy, CoNi/graphene nanocomposites, electromagnetism

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Publication history
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Acknowledgements

Publication history

Received: 29 August 2017
Revised: 19 October 2017
Accepted: 25 October 2017
Published: 12 May 2018
Issue date: May 2018

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany 2017

Acknowledgements

Acknowledgements

This research was supported by the National Key Research and development Program of China (No. 2016YFA0202701), the Program of Introducing Talents of Discipline to Universities (No. B14003), the National Natural Science Foundation of China (NSFC) (Nos. 51722203, 21771024, 51672026 and 51527802), the Research Fund of Co-construction Program from Beijing Municipal Commission of Education (No. Z161100002116027), and the Fundamental Research Funds for the Central Universities.

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