Achieving multiband compatible and mechanical tuning absorber using edge topological defect-induced graphene plasmon

• Published in: Carbon (New York) 2022-06, Vol.192, p.1-13
• Main Authors: Shan, Bo, Xia, Lun, Ma, Suping, Yin, Zhanhao, Liu, Xiaoyan, Li, Guanghao, Huang, Yi
• Format: Article
• Language: English
• Subjects: Graphene; Integration of structure and function; Microwave absorption; Multiband absorption; Plasmon
• ISSN: 0008-6223; 1873-3891
• DOI: 10.1016/j.carbon.2022.02.038

Graphene has been shown to be a high-performance microwave-absorbing material with broadband potential. However, simultaneous realization of multiband compatible strong absorption is still a challenge. In this study, graphene rich in edge topological defects is successfully synthesized, and the effect of defect density on electromagnetic parameters has been investigated. Electrons (π electrons, π+σ electrons) located at edge defects alter the loss paths and plasma absorption frequencies of the graphene aerogels. These improvements in electrical properties give the graphene aerogel a more coordinated impedance matching and attenuation capability, allowing it to achieve strong absorption in multiband (S, X, Ku band) simultaneously. In addition, a mechanically tunable multimode absorber can be further realized by incorporating porous polyimide foam. The strong absorption (>99.9%) of a wide range of variable bands (S, C, X, and Ku bands) can be flexibly adjusted by stress cycling of piezo resistive foam. In addition, self-cleaning, high temperature resistance, and simple processability are expected to deliver solutions for the communication and Internet of Things engineering. [Display omitted] •Extremely distinctive multi-band absorption is well realized here.•Tunable frequency shifts with immediate and stable electrical signal feedback.•Versatile serviceability.