Layered Structural PBAT Composite Foams for Efficient Electromagnetic Interference Shielding

• Published in: Nano-micro letters Vol. 16; no. 1; pp. 31 - 14
• Main Authors: Yang, Jianming, Wang, Hu, Zhang, Yali, Zhang, Hexin, Gu, Junwei
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01.12.2024; Springer Nature B.V; SpringerOpen
• Subjects: Absorption; Absorptivity; Carbon dioxide; Chemical engineering; Composite materials; Effectiveness; Electromagnetic interference; Electromagnetic interference shielding; Electromagnetic shielding; Engineering; Foaming; Foams; Iron oxides; Layered structure; Microcellular; Microspheres; Microwaves; Multi wall carbon nanotubes; Nanoparticles; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Phase separation; Poly (butyleneadipate-co-terephthalate); Radiation; Reflection; Scraping; Silver; Special issue on EM Wave Functional Materials; Supercritical carbon dioxide foaming; Sustainable development; Weight reduction; Electromagnetic interference shielding; Supercritical carbon dioxide foaming; terephthalate; Layered structure; Poly (butyleneadipate; Microcellular; Poly (butyleneadipate-co-terephthalate)
• ISSN: 2311-6706; 2150-5551; 2150-5551
• DOI: 10.1007/s40820-023-01246-8

Highlights A layered segregated shielding network was organized in porous PBAT/Fe 3 O 4 @MWCNTs/Ag composite by scCO 2 foaming and scraping techniques. The composite foam achieved an electromagnetic interference (EMI) shielding effectiveness (SE) of up to 68.0 dB and a reflectivity of as low as 23% due to the “absorption-reflection-re-absorption” shielding mechanism. The solid and foamed PBAT/Fe 3 O 4 @MWCNTs/Ag composites displayed superior retention (> 92%) of EMI SE even after peeling experiment of 500 times under 100 g weight pressure. The utilization of eco-friendly, lightweight, high-efficiency and high-absorbing electromagnetic interference (EMI) shielding composites is imperative in light of the worldwide promotion of sustainable manufacturing. In this work, magnetic poly (butyleneadipate- co -terephthalate) (PBAT) microspheres were firstly synthesized via phase separation method, then PBAT composite foams with layered structure was constructed through the supercritical carbon dioxide foaming and scraping techniques. The merits of integrating ferroferric oxide-loaded multi-walled carbon nanotubes (Fe 3 O 4 @MWCNTs) nanoparticles, a microcellular framework, and a highly conductive silver layer have been judiciously orchestrated within this distinctive layered configuration. Microwaves are consumed throughout the process of “absorption-reflection-reabsorption” as much as possible, which greatly declines the secondary radiation pollution. The biodegradable PBAT composite foams achieved an EMI shielding effectiveness of up to 68 dB and an absorptivity of 77%, and authenticated favorable stabilization after the tape adhesion experiment.