Assembled porous Fe3O4@g-C3N4 hybrid nanocomposites with multiple interface polarization for stable microwave absorption. Issue 16 (November 2018)

• Record Type: Journal Article
• Authors: Yu, Jieyi; Chi, Fangli; Sun, Yuping; Guo, Junjie; Liu, Xianguo
• Is Part Of: Ceramics international. Volume 44:Issue 16(2018)
• Page Start: 19207
• Page End: 19216
• Publication Date: 2018-11
• Subjects: Fe3O4 -- G-C3N4 -- Porous nanospheres -- Nanocomposites -- Microwave absorption performance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.07.143
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Magnetic/dielectric composites can offer good electromagnetic impendence. However, the strategy for embodying strong absorbing ability and broad effective absorption band simultaneously is a significant challenge. Therefore, assembled porous Fe3 O4 @g-C3 N4 hybrid nanocomposites have been designed and synthesized, in which porous Fe3 O4 nanospheres assembled by ~ 3 nm Fe3 O4 nanoparticles are surrounded by g-C3 N4 . The introduction of g-C3 N4 improves dielectric loss ability at 2–18 GHz and magnetic loss ability at 2–10 GHz, and enhances attenuation constant, and increases electromagnetic impedance degree. These merits ensure that assembled porous Fe3 O4 /g-C3 N4 hybrid nanocomposites deliver superior microwave absorption performance, such as effective absorption bandwidth, f E, (reflection loss less − 10 dB) exceeding 5 GHz at 2.0–2.3 mm, the maximal f E of 5.76 GHz and minimal reflection loss of at least − 20 dB with thickness ranging from 2.3 to 10.0 mm, avoiding the sensitivity of absorption properties to absorbing layer thickness. Stable microwave absorbing performance originates from multi-interfacial polarization, multi-reflection, enhanced electromagnetic loss capability, and good electromagnetic impedance. Our study offers a new idea for stable microwave absorber at 2–18 GHz.