Regulation of PPy Growth States by Employing Porous Organic Polymers to Obtain Excellent Microwave Absorption Performance

• Published in: Small (Weinheim an der Bergstrasse, Germany) Germany), 2024-12, Vol.20 (49), p.e2406001-n/a
• Main Authors: Zhang, Liwen, Du, Jiawei, Tang, Peng, Zhao, Xueying, Hu, Chuangwei, Dong, Yu, Zhang, Xuyang, Liu, Nana, Wang, Bo, Peng, Ruihui, Zhang, Yaohong, Wu, Guohua
• Format: Article
• Language: English
• Subjects: Composite materials; conducting network; Electromagnetic radiation; electromagnetic wave absorbing materials; growth states; Heterostructures; Microwave absorption; Polymers; polypyrrole; Polypyrroles; Porous materials; porous organic polymers; Thickness
• ISSN: 1613-6810; 1613-6829; 1613-6829
• DOI: 10.1002/smll.202406001

Regulating the different growth states of polypyrrole (PPy) is a key strategy for obtaining PPy composites with high electromagnetic wave (EMW) absorption properties. This work finds that the growth states of PPy is regulated by controlling the amount of pyrrole added during the preparation of composites, so as to regulate the development of conductive networks to obtain excellent EMW absorption performance. The POP/PPy‐200 composite achieves an effective absorption bandwidth (EAB) of 6.24 GHz (11.76–18.00 GHz) at a thickness of only 2.34 mm, covering 100% of the Ku band. The minimum reflection loss of −73.05 dB can be demonstrated at a thickness of only 2.29 mm, while at the same time showing an EAB of 5.96 GHz to meet the requirements of “thin”, “light”, “wide”, and “strong”. Such excellent EMW absorption performance is attributed to the conductive loss caused by the regulation of the growth states of PPy and the polarization loss caused by the heterostructure. This work also addresses the key challenge that porous organic polymers (POPs) cannot be applied to EMW absorption due to poor conductivity and providing new insights into the candidates for EMW absorbing materials. PPy grows on the surface of POP single template in two states of “independent growth” and “attached growth”. The POP/PPy‐200 composite with a mass filling ratio of only 24% achieved an EAB of 6.24 GHz at a thickness of only 2.34 mm. The minimum RL of −73.05 dB can be performed at a thickness of only 2.29 mm with an EAB of 5.96 GHz.