Preparation and microwave absorption properties of magnetic functional porous biomass carbon composites

YANG Qi-xin; YU Lu-jun; DONG Yu-bing; FU Ya-qin; ZHU Yao-feng

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Article Navigation > New Carbon Mater. > 2019 > 34(5): 455-463

YANG Qi-xin, YU Lu-jun, DONG Yu-bing, FU Ya-qin, ZHU Yao-feng. Preparation and microwave absorption properties of magnetic functional porous biomass carbon composites. New Carbon Mater., 2019, 34(5): 455-463.

Citation:

YANG Qi-xin, YU Lu-jun, DONG Yu-bing, FU Ya-qin, ZHU Yao-feng. Preparation and microwave absorption properties of magnetic functional porous biomass carbon composites. New Carbon Mater., 2019, 34(5): 455-463.

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Preparation and microwave absorption properties of magnetic functional porous biomass carbon composites

Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China

Funds: National Natural Science Foundation of China (51503183).

Received Date: 2019-07-11
Accepted Date: 2019-11-04
Rev Recd Date: 2019-09-30
Publish Date: 2019-10-28

Abstract

Abstract

Magnetic functional biomass carbon (Fe₃O₄/porous biomass carbon) microwave absorbing materials with both dielectric loss and magnetic loss were prepared by carbonization and a hydrothermal method. With increasing FeCl₃ concentration, aggregated Fe₃O₄ nano-crystallites on the surface of the carbon increased under a hydrothermal temperature of 200℃, with a uniform particle size with an average of about 200 nm. The effects of the morphology, structure and Fe₃O₄ content on the microwave absorbing properties of the composites were investigated, and the mechanism of multi-loss microwave absorption was also analyzed. The results show that when the concentration of FeCl₃ is 4 mmol, the magnetically functionalized biomass-carbon composite has an excellent microwave absorbing performance in the range 2-18 GHz, and the thickness is 2 mm. The maximum reflectance loss at 11.42 GHz is up to -42.2 dB, and the effective bandwidth is 3.14 GHz (reflection loss is less than -10 dB).
- Biomass carbon material,
- Fe₃O₄,
- Composite material,
- Microwave absorbing performance

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