Hierarchical core-shell FeS2/Fe7S8@C microspheres embedded into interconnected graphene framework for high-efficiency microwave attenuation. (15th January 2023)

• Record Type: Journal Article
• Authors: Wang, Nian; Wang, Yan; Lu, Zhao; Cheng, Runrun; Yang, Longqi; Li, Yongfei
• Is Part Of: Carbon. Volume 202(2023)Part 1
• Page Start: 254
• Page End: 264
• Publication Date: 2023-01-15
• Subjects: Prussian blue -- Metal sulfides -- Core-shell heterostructure -- Interfacial polarization -- Synergistic effect; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2022.10.083
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: With the imminent era dominated by high-tech electronic products, the development of high-efficiency electromagnetic wave absorption materials has become a critical task. Rational component regulation and structural design are considered to be effective methods to optimize the electromagnetic wave absorption performance of materials. Herein, we first prepared a Fe-PBA@ PDA@GO precursor via solvothermal method; then, vulcanization was used to develop a FeS2 /Fe7 S8 @C@rGO composite with a core-shell heterostructure, in which core-shell FeS2 /Fe7 S8 @C microspheres were embedded on the wrinkled reduced graphene oxide layer. FeS2 /Fe7 S8 @C@rGO, as a multi-component composite, demonstrates superior impedance matching and can thus capture more electromagnetic waves, while the multiple losses facilitate the dissipation of incident electromagnetic waves. Concretely, FeS2 /Fe7 S8 @C@rGO can display significant attenuation of incident electromagnetic waves through multi-interface polarization, dipole polarization, resonance loss and eddy current loss. Additionally, the three-dimensional hierarchical structure not only improves the conductive loss, but also promotes multiple reflections and scattering. The FeS2 /Fe7 S8 @C@rGO composite exhibits a minimum reflection loss of −62.7 dB and an effective absorption broadband (6.1 GHz) with a filler loading of 20 wt% at 2.2 mm, and the effective absorption bandwidth reaches 7.6 GHz at a layer thickness of 2.5 mm. These results provide a valuable reference for the preparation of high-performance microwave absorbers through composition adjustment and controlled structural design. Graphical abstract: Image 1