Controlling the heterogeneous interfaces of Fe3O4/N-doped porous carbon via facile swelling for enhancing the electromagnetic wave absorption. (January 2022)

• Record Type: Journal Article
• Authors: Ren, Lianggui; Wang, Yiqun; Jia, Zirui; He, Qinchuan; Wu, Guanglei
• Is Part Of: Composites communications. Volume 29(2022)
• Publication Date: 2022-01
• Subjects: Microwave absorption -- N-Fe3O4@UHPC -- Nanocomposites
• DOI: 10.1016/j.coco.2021.101052
• Languages: English
• ISSNs: 2452-2139

Abstract

Abstract: Bio-derived carbon is considered to be an ideal lightweight electromagnetic waves (EMW) absorbing material. Herein, Fe3 O4 /N-doped porous carbon (N-Fe3 O4 @UHPC) is successfully prepared through simple swelling-freeze drying and pyrolysis. The method can introduce evenly distributed Fe3 O4 and porous structure into the carbon, which can effectively improve the impedance matching and multiple reflection and scattering of EMW. N-Fe3 O4 @UHPC-4 exhibits superior electromagnetic wave absorption performance with the minimum reflection loss value of -77.91 dB at 17.21 GHz. Besides, the optimum effective absorption broadband value of N-Fe3 O4 @UHPC-2 is up to 8.49 GHz from 9.51 to 18 GHz at 3.0 mm, which almost cover the whole X band and Ku band. The excellent EMW performance of N-Fe3 O4 @UHPC is attributed to the interface polarization, dipole polarization, natural resonance, eddy current, exchange resonance, and the conductive network formed. Graphical abstract: Image 1 Highlights: The Fe3 O4 /N-doped porous carbon is synthesized by simple swelling-freeze drying and pyrolysis. The uniform distribution of Fe3 O4 and construction of porous structure are beneficial to microwave absorption. The maximum reflection loss and EMW of the N-Fe3 O4 @UHPC can reach -77.91 dB at 2.21 mm and 8.49 GHz.