Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 838, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.155629
Keywords
Nanocomposites; Microwave absorption performance; Carbon
Categories
Funding
- Natural Science Foundation of Zhejiang Province [LQ20E010006, LD19E010001, LR18E010001]
- Key Research and Development plan of Zhejiang Province [2020C05014]
- Education Development Program of Education Department of Jilin Province [JJKH20180425KJ]
- National Natural Science Foundation of China [U1704253, U1908220]
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Three main strategies for designing efficient microwave absorber includes the intrinsic dielectric/magnetic properties, the novel structure and the single atom doping. The Fe-N/C nanocomposites integrate the advantages of above three strategies into one system. In this work, the method for preparing Fe-N/C nanocomposite by calcining the FePc@ZIF-8 precursor under a flowing N-2 gas is described. Fe-N/C nanocomposites, displaying respectable dodecahedron-like morphology, have the merits of strong absorption ability, wide effective absorption bandwidth, thin thickness, and excellent microwave absorption efficiency, which are attributed to the synergistic effect of good electromagnetic loss capacity and proper impedance matching originating from intrinsic dielectric/magnetic properties, the novel structure and the single atoms (Fe and N) doping. Fe-N/C-24 composite delivers an optimal reflection loss of -30.98 dB, an effective absorption bandwidth of 5.04 GHz, the microwave absorption capacity of 87.61 dB GHz the absorption efficiency of 51.53 dB GHz/mm at 1.7 mm. (C) 2020 Elsevier B.V. All rights reserved.
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