Desirable microwave absorption performance of ZnFe2O4@ZnO@rGO nanocomposites based on controllable permittivity and permeability. Issue 13 (September 2020)

• Record Type: Journal Article
• Authors: Li, Fei; Zhuang, Li; Zhan, Wenwei; Zhou, Manxi; Sui, Gang; Zhou, Aosong; Bai, Gang; Xiao, Wei; Yang, Xiaoping
• Is Part Of: Ceramics international. Volume 46:Issue 13(2020)
• Page Start: 21744
• Page End: 21751
• Publication Date: 2020-09
• Subjects: B. Interfaces -- B. Nanocomposites -- C. Magnetic properties -- C. Microwave absorption performance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.05.283
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: ZnO decorated ZnFe2 O4 nanoparticles were synthesized and combined with reduced graphene oxide (rGO) to form ZnFe2 O4 @ZnO@rGO ternary hierarchical nanocomposites by a controllable method. The microstructure, morphology, and microwave absorption performance of the ZnFe2 O4 @ZnO@rGO nanocomposites were investigated in detail. The permittivity and permeability of the composites can be effectively regulated by controlling the content of ZnO and rGO to achieve a good impedance matching. Due to the synergistic effect of dielectric loss and magnetic loss, the ZnFe2 O4 @ZnO@rGO nanocomposites exhibited strong wave absorption and wide absorption bandwidth. The optimal reflection loss (RL) of the ZnFe2 O4 @ZnO@rGO nanocomposites reached −35.2 dB at 12.0 GHz with a thickness of 2.0 mm and the effective absorption bandwidth was 3.7 dB. The ZnFe2 O4 @ZnO@rGO hierarchical architecture produced lots of heterogeneous interfaces which made a significant contribution to the wave absorption performance. The combination of interfacial polarization, dipole polarization, and eddy current loss enhanced the microwave absorption capacity of the ZnFe2 O4 @ZnO@rGO system. This work provides a feasible approach for the design and preparation of wave absorption materials with tunable permittivity and permeability.