Green electromagnetic interference shielding films with unique and interconnected 3D magnetic/conductive interfaces

• Published in: Applied surface science Vol. 636; p. 157841
• Main Authors: Wei, Zijian, Cai, Yifan, Xie, Zhaoxin, Meng, Yanyan, Zhan, Yanhu, Hu, Xuxu, Xia, Hesheng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2023
• Subjects: Biomass-derived carbon; Fe3O4 nanoparticles; Green electromagnetic shielding; In situ coprecipitation; Low reflection; Green electromagnetic shielding; Biomass-derived carbon; Low reflection; In situ coprecipitation; Fe3O4 nanoparticles
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2023.157841

[Display omitted] •Develop a novel in situ coprecipitation approach.•Construct an interconnected 3D Fe3O4@carbon core–shell network.•Fabricate the green electromagnetic shielding composites.•Possess the specific shielding effectiveness of 285 dB/mm. Magnetic nanoparticle-decorated biomass-derived carbon films are intriguing green electromagnetic interference shielding composites because of their eco-friendly, high shielding effectiveness, low reflection loss, etc. However, it is still difficult to uniformly decorate magnetic nanoparticles onto a whole interconnected carbon skeleton. Herein, to overcome this difficulty, a novel in situ coprecipitation approach was developed to construct the 3D Fe3O4@carbon core-shell network with interconnected magnetic/conductive interfaces. Briefly, common filter papers (CFPs) decorated with metal ions were immersed into ammonia solutions, to in situ generate Fe3O4 nanoparticles on whole CFPs. Subsequently, Fe3O4-decorated CFPs are carbonized to obtain magnetic and conductive biomass-derived carbon films. The novel structure endows the resultant films with excellent electrical conductivity (673–732 S/m), excellent shielding (30.6 dB) and low reflection coefficient (R = 0.354). The specific SE of our films is as high as 191.3 dB/mm, exceeding that of the reported biomass-derived carbon materials.