Heterostructure design of carbon fiber@graphene@layered double hydroxides synergistic microstructure for lightweight and flexible microwave absorption. (September 2022)

• Record Type: Journal Article
• Authors: Lu, Zhao; Wang, Yan; Di, Xiaochuang; Wang, Nian; Cheng, Runrun; Yang, Longqi
• Is Part Of: Carbon. Volume 197(2022)
• Page Start: 466
• Page End: 475
• Publication Date: 2022-09
• Subjects: Microwave absorption -- Biomass-derived carbon -- Core-sheath structure -- Heteroatomic doping -- Flexibility; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2022.06.075
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: At present, there is an urgent need to develop lightweight and flexible high-efficiency microwave absorbing materials. Herein, reduced graphene oxide (RGO) was successfully attached to cotton-derived flexible carbon fiber (CF) by electrostatic self-assembly, and then two-dimensional layered double hydroxides (LDH) were closely arranged on the surface of CF/RGO to form a unique core-sheath structure. The carbonized CF contains a large number of heteroatoms, which enhance the dielectric loss caused by polarization. In addition, RGO acts as an intermediate layer to facilitate the conductive loss of the CF/RGO/LDH composite. Moreover, the voids created by the stacked LDH induce the scattering and reflection of electromagnetic waves and optimize the impedance characteristics. As a result, the ternary core-sheath CF/RGO/LDH composite shows the optimal reflection loss value of −60.9 dB at 10.3 GHz with a thickness of 2.5 mm and efficient absorption bandwidth value of 6.1 GHz when the filling ratio is only 20 wt%. This work provides an efficient route for the design and preparation of lightweight and flexible microwave absorbing materials. Graphical abstract: Image 1