AUTHOR=Peymanfar Reza , Dogari Haniyeh , Selseleh-Zakerin Elnaz , Hedayatzadeh Mohammad Hossein , Daneshvar Sara , Amiri-Ramsheh Nasim , Ghafuri Hossein , Mirkhan Ali , Ji Guangbin , Aslibeiki Bagher TITLE=Recent advances in microwave-absorbing materials fabricated using organic conductive polymers JOURNAL=Frontiers in Materials VOLUME=10 YEAR=2023 URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2023.1133287 DOI=10.3389/fmats.2023.1133287 ISSN=2296-8016 ABSTRACT=

Microwave-absorbing materials are widely utilized in military and civilian applications. Moreover, their environmental potential to refine electromagnetic pollution has promoted their importance. An ideal conjugated organic polymer for use as a microwave-absorbing material should possess high porosity, low density, a long conjugated backbone, a narrow energy band gap, proper conductive and relaxation loss, and vast specific surface area. This review describes the conductive polymer types used as microwave-absorbing material and their composites toward improving microwave-absorbing capability. Additionally, recent developments in synthetic strategies and structural properties of pure carbon-based microwave-absorbing materials and other conjugated structures having heteroatoms in their chains are discussed. In the field of microwave absorbers, the predominant microwave-absorbing mechanisms among conductive polymers and their composites as well as the special mechanisms for tuning microwave-absorbing characteristics, including metamaterial and quasi-antenna features, are dissected. This review sheds new light on architecting low-density and high-performance microwave-absorbing structures and offers new prospects in tailoring conjugated polymers based on their dominant mechanisms.