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 (RL_min) for PIC/rGO is -57.22 dB at 4.36 mm thickness. The effective absorption bandwidth (EA

SUBMITTER: Wang Z 

PROVIDER: S-EPMC9977443 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature