Magnetic Fe nanoparticle to decorate N dotted C as an exceptionally absorption-dominate electromagnetic shielding material. (15th May 2020)

• Record Type: Journal Article
• Authors: Jia, Zirui; Kou, Kaichang; Yin, Shuai; Feng, Ailing; Zhang, Chuanhui; Liu, Xuehua; Cao, Haijie; Wu, Guanglei
• Is Part Of: Composites. Number 189(2020)
• Publication Date: 2020-05-15
• Subjects: N dotted amorphous carbon -- Magnetic Fe NPs -- Electromagnetic shielding -- Absorption dominate -- Tunable component; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2020.107895
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: Conversional electromagnetic shielding material with strong reflection coefficient are becoming insufficient for today's application, since the serious 2nd electromagnetic pollution. Herein, we demonstrate a magnetic carbon based shielding material constructed by magnetic Fe nanoparticles (NPs) and N dotted amorphous carbon nanosphere (~200 nm). The structure, morphology, chemical composition of the samples have been studied in depth. It is observed that the average sizes of Fe NPs is ~8.0 nm and can be loaded well on the surface of N dotted amorphous spheres. The electromagnetic shielding performance has been investigated. Significantly, the as-prepared samples show excellent electromagnetic shielding performance. The maximum shielding effectiveness can up to 30 dB under a thickness of 1.2 mm. More importantly, the reflection coefficient can be reduced to 2.3 dB, presenting excellent absorptiondominate shielding performance. The desirable shielding mechanism with less reflection are attributed to the boosted loss ability and matched impedance matching behavior, which originate from N doping and magnetic component. This work which integrates magnetic component with N dotted amorphous carbon has been demonstrated as a useful strategy for the development of absorption dominate EM shielding material. Graphical abstract: The magnetic N dotted carbon/Fe sample with tunable component was developed and showed excellent absorption dominate electromagnetic shielding performance. Image 1 Highlights: Magnetic component (Fe) nanoparticles can be easily loaded on N dotted carbon. The as-prepared shows dual magnetic and dielectric loss ability. The impedance matching ability can be greatly improved. The optimal sample has an excellent absorption dominate ability with a reduced SER value of 2.1 dB. The total shielding effectiveness was ~21 dB under a thickness of 1.2 mm.