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Open AccessArticle

Facile Synthesis of Cobalt-Doped Porous Composites with Amorphous Carbon/Zn Shell for High-Performance Microwave Absorption

1
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
2
Ministry of Education Key Laboratory of Textile Fiber Products, School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, China
3
Center for Future Materials, University of Southern Queensland, Toowoomba 4350, Australia
4
School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China
5
Institute of Advanced Material Manufacturing Equipment and Technology, Wuhan University of Technology, Wuhan 430070, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(2), 330; https://doi.org/10.3390/nano10020330 (registering DOI)
Received: 9 January 2020 / Revised: 11 February 2020 / Accepted: 12 February 2020 / Published: 14 February 2020
(This article belongs to the Section Synthesis, Interfaces and Nanostructures)
A facile method for the preparation of microwave absorbers with low density, high microwave absorptivity, and broad band is of paramount importance to the progress in practical application. Herein, commonly-used metal organic frameworks (MOFs) prepared just by mechanical stirring in methanol at room temperature were chosen as sacrificial templates to synthesize porous carbon composites with tunable dielectric and magnetic properties. With the replacement of Co atoms on the surface of zeolitic imidazolate framework-67 (ZIF-67) by Zn atoms, a Co-doped porous carbon composite with a low-dielectric amorphous carbon/Zn shell was constructed after annealing, leading to excellent impedance matching condition. Consequently, the as-obtained composite (Co/[email protected]) shows marvelous microwave absorption properties with an absorption capacity of −43.97 dB and a corresponding effective absorption bandwidth of 4.1 GHz, far exceeding that of the traditional porous carbon and composites directly derived from ZIF-67. The results provide a convenient way to modify MOFs for enhanced microwave absorption materials from the synergy of dielectric and magnetic losses.
Keywords: MOFs-derived carbon composites; porous structure; impedance match; microwave absorption MOFs-derived carbon composites; porous structure; impedance match; microwave absorption
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MDPI and ACS Style

Wu, Q.; Jin, H.; Zhang, B.; Huo, S.; Yang, S.; Su, X.; Wang, J. Facile Synthesis of Cobalt-Doped Porous Composites with Amorphous Carbon/Zn Shell for High-Performance Microwave Absorption. Nanomaterials 2020, 10, 330.

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