Journal
CARBON
Volume 175, Issue -, Pages 233-242Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.01.001
Keywords
Hollow structure; Multi-shell structure; Carbon spheres; Microwave absorption properties
Funding
- Natural Science Foundation of Hunan Province [2019JJ50115]
- Key Laboratory of Solidification Processing in NPU [SKLSP202021]
- Hunan Key Laboratory of Advanced Fibers and Composites, Central South University [XTXFKT2020-01]
- China Scholarship Council
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The multi-shell hollow carbon submicrospheres (CSs) were designed to enhance microwave absorption performance, achieved through a combination of hydrothermal method, calcination, and etching process. The multi-shell CSs exhibited improved complex permittivity and tangent loss, with enhanced polarization occurring on the interfaces among different shells. This unique structure of multi-shell hollow CSs resulted in promising high-performance microwave absorbers, as indicated by the reflection loss (RL) reaching -48.5 dB with a wide effective absorption bandwidth of 4.2 GHz in the study.
Multi-shell hollow carbon submicrospheres (CSs) were designed for the improvement in microwave absorption performance. Solid/hollow CSs with a single shell or multiple shells were successfully synthesized by a combination of hydrothermal method, calcination, and etching process. Microstructures, dielectric and microwave absorption properties in the frequency range of 2-18 GHz of these CSs were compared and studied systematically to investigate the effect of the multi-shell hollow structure of CSs on the microwave absorption properties. Results revealed that the hollow and solid CSs had the same crystallinity, degree of graphitization, and carbon bonds. Thus, the improved complex permittivity and tangent loss of hollow CSs were mainly related to their unique structure. The multi-shell CSs possessed more reflections of microwaves and stronger conductive loss than the single-shell one. The enhanced polarization occurring on the interfaces among the different shells of the multi-shell hollow CSs improved the dielectric loss ability. The reflection loss (RL) of the triple-shell hollow CSs/paraffin composites therefore reached -48.5 dB with a wide effective absorption bandwidth (RL < -10 dB) of 4.2 GHz, which indicated that the multi-shell hollow CSs are promising high-performance microwave absorbers. (C) 2021 Elsevier Ltd. All rights reserved.
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