Controllable heterogeneous interfaces of cobalt/carbon nanosheets/ rGO composite derived from metal-organic frameworks for high-efficiency microwave attenuation. (February 2022)

• Record Type: Journal Article
• Authors: Wang, Yan; Di, Xiaochuang; Lu, Zhao; Cheng, Runrun; Wu, Xinming; Gao, Peihu
• Is Part Of: Carbon. Volume 187(2022)
• Page Start: 404
• Page End: 414
• Publication Date: 2022-02
• Subjects: Metal organic frameworks -- Hierarchical structure -- Interfacial polarization -- Microwave absorption performance; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2021.11.027
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Structural design and composition control are crucial in determining the EM wave attenuation of an absorber; however, the balancing of the EM parameters has always been a formidable challenge. Here, we successfully designed a 3D hierarchical Co/carbon nanosheets (CNS)/rGO magnetic-dielectric composite with controllable composition and microstructure as a high-efficiency absorber by using a three-step route. Benefiting from the synergetic effect and heterogeneous interfaces, the hierarchical Co/CNS/rGO composite displayed strong microwave attenuation and broad absorption frequency band. Furthermore, the nanocomposite with porous structure promoted multiple reflection and scattering, thereby improving the attenuation capacity. The hierarchical Co/CNS/rGO composite exhibited strong microwave absorption capabilities when the filler loading was 20 wt%. Specifically, the maximum reflection loss (RL) was up to −65.5 dB at 12.4 GHz with a matched thickness of 2.5 mm and the corresponding absorption bandwidth was 8 GHz. Such excellent results not only serve as an inspiration for the enhancement of interfacial polarization of an absorber, but they also provide a novel avenue to synthesize high-efficiency microwave absorber with controllable structural design and composition regulation. Graphical abstract: Image 1