Issue 11, 2023, Issue in Progress

Polyimide aerogel-derived amorphous porous carbon/crystalline carbon composites for high-performance microwave absorption

Abstract

High-performance polyimide-based porous carbon/crystalline composite absorbers (PIC/rGO and PIC/CNT) were prepared by vacuum freeze-drying and high-temperature pyrolysis. The excellent heat resistance of polyimides (PIs) ensured the integrity of their pore structure during high-temperature pyrolysis. The complete porous structure improves the interfacial polarization and impedance-matching conditions. Furthermore, adding appropriate rGO or CNT can improve the dielectric losses and obtain good impedance-matching conditions. The stable porous structure and strong dielectric loss enable fast attenuation of electromagnetic waves (EMWs) inside PIC/rGO and PIC/CNT. The minimum reflection loss (RLmin) for PIC/rGO is −57.22 dB at 4.36 mm thickness. The effective absorption bandwidth (EABW, RL below −10 dB) for PIC/rGO is 3.12 GHz at 2.0 mm thickness. The RLmin for PIC/CNT is −51.20 dB at 2.02 mm thickness. The EABW for PIC/CNT is 4.08 GHz at 2.4 mm thickness. The PIC/rGO and PIC/CNT absorbers designed in this work have simple preparations and excellent EMW absorption performances. Therefore, they can be used as candidate materials in EMW absorbing materials.

Graphical abstract: Polyimide aerogel-derived amorphous porous carbon/crystalline carbon composites for high-performance microwave absorption

Supplementary files

Article information

Article type
Paper
Submitted
09 Jan 2023
Accepted
23 Feb 2023
First published
01 Mar 2023
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2023,13, 7055-7062

Polyimide aerogel-derived amorphous porous carbon/crystalline carbon composites for high-performance microwave absorption

Z. Wang, Y. Min, J. Fang, W. Yu, W. Huang, X. Lu and B. Wang, RSC Adv., 2023, 13, 7055 DOI: 10.1039/D3RA00155E

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