Journal
CARBON
Volume 173, Issue -, Pages 655-666Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2020.11.043
Keywords
Organic polymer composites; Magnetic particles; N-doped carbon; Impedance matching; Strong microwave absorption
Funding
- Natural Science Foundation of Shaanxi Province [2019JQ-222]
- Fundamental Research Funds for the Central Universities [310201911cx037]
- seed Foundation of Innovation and Creation for Graduate Students in Northwestern Polytechnical University [CX202010]
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This study reported the fabrication of metal porous N-doped carbon absorbers using a coordination assembly strategy, which demonstrated excellent absorption performance through structure design and composition control.
Composition and microstructure are two determinative factors for carbon-based absorbers, therefore, balancing the dual coordination possess a formidable importance in the final performance. In this paper, magnetic particles (Fe, Co and Ni) encapsulated in porous N-doped carbon as lightweight and efficient microwave absorbers are reported. The coordination assembly strategy is firstly used to fabricate metal-organic polymer coordination composites, then, these metal ions are in situ reduced by a carbonization process, resulting in magnetic porous N-doped carbon (Fe@PNC, Co@PNC and Ni@PNC) composites with adjusted composition and porous microstructure. Benefiting from the porous microstructure with large surface area, enhanced polarization loss and the synergetic effects between magnetic and dielectric loss, the composites exhibit unexceptionable attenuation ability. Concretely, the minimum reflection loss for Fe@PNC, Co@PNC and Ni@PNC reaches as high as -61.6 dB, -65 dB and -65.1 dB with the matched thickness of 2 mm, 2.5 mm and 3.5 mm, and the effective bandwidths are 5.3 GHz (at 3.4 mm), 6.7 GHz (at 2 mm) and 8.6 GHz (at 2.5 mm), respectively. This strategy provides not only a new guidance in the fabrication of carbon absorbers, but also a comprehension in the structure design and composition control through the chelating ability. (C) 2020 Elsevier Ltd. All rights reserved.
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