期刊
CERAMICS INTERNATIONAL
卷 47, 期 2, 页码 2155-2164出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.09.053
关键词
Electromagnetic wave absorption; Broadband; Cu2O; Nanoporous carbon
资金
- National Natural Science Foundation of China [21264011]
- China Scholarship Council [201708360032]
- Beijing Institute of Aeronautical Materials
This study successfully addresses the impedance mismatch issue of carbon-based materials in the field of microwave absorption by synthesizing Cu2O@nanoporous carbon composites. This results in superior ultrabroad-bandwidth absorptivity, offering a new opportunity for obtaining ultrabroad effective bandwidth.
The application of carbon-based materials in microwave absorption (MA) field are limited due to the impedance mismatch caused by high permittivity and low permeability. In this work, Cu2O@nanoporous carbon (Cu2O@NPC) composites derived from Cu-based MOFs are synthesized using a simple method. Variation of C and Cu2O contents in Cu2O@NPC allows the regulation of permittivity and permeability, resulting in superior ultrabroad-bandwidth absorptivity. The maximum reflection loss (RL) of Cu2O@NPC-4 is up to -31.1 dB at 5.6 GHz, while the effective bandwidth (RL <= -10 dB) can reach 7.3 GHz (10.7-18 GHz) with a matching thickness of 1.85 mm. The results of this study open a new opportunity for solving the impedance mismatch of C-based materials and obtain ultrabroad effective bandwidth.
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