Excellent Microwave Absorption Performance in Porous Co/C Nanocomposites by Biomass Conversion
Yuqing Huang, Ge Liu, Dechun Liu, Meng Hao, Peitao Xie, Zhicheng Shi and Guohong Lin
1 College of Materials Science and Engineering, Qingdao University, Qingdao, Shandong, 266071, China
2 Qingdao Municipal Hospital, Qingdao, Shandong, 266000, China
3 School of Materials Science and Engineering, Ocean University of China, Qingdao, Shandong, 266100, China
#These authors contributed equally to this work.
Abstract
Carbon-based composites have been considered as the most popular lightweight microwave absorption materials and become a hot research topic. In this work, Co/C nanocomposites are prepared by a vacuum-assisted impregnation and carbothermic reduction process. Carbon matrix has porous honeycomb-like microstructure coming from the wood precursor, the cobalt nanoparticles are uniformly distributed on the wall of porous carbon matrix. The optimal microwave-absorption is achieved with a minimum RL of -49.8 dB at 9.4 GHz, matched with a thin thickness of 1.5 mm, and its effective microwave-absorption covers a wide frequency range by changing the thickness of the sample, from 4.8 to 11.2 GHz and from 11.4 to 18 GHz. The excellent absorption performance of Co/C nanocomposites is mainly attributed to good impedance matching and moderate attenuation factor, which is realized by dielectric relaxation. This work demonstrates a simple method for synthesizing high-performance microwave-absorbing nanocomposites by biomass conversion.
Publication details
Received: 26 Apr 2023
Revised: 05 May 2023
Accepted: 09 May 2023
Published online: 10 May 2023
Article type:
Research Paper
DOI:
10.30919/esfaf888
Volume:
12
Article :
888
Citation:
ES Food & Agroforestry, 2023, 12, 888
Permissions:
Copyright
Number of downloads:
97
Citation Information:
26
Description:
The excellent microwave-absorption is achieved with a minimum RL of -49.8 dB, matched with a thin th....
The excellent microwave-absorption is achieved with a minimum RL of -49.8 dB, matched with a thin thickness of 1.5 mm.
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