Abstract
Electromagnetic interference (EMI) shielding materials with adjustable frequency-selective shielding performance are promising to address the concerns of electromagnetic (EM) radiation pollution with the development of fifth-generation (5G) communication and emerging of electronic devices. Herein, conductive polymer foams with sandwich structure and selective foaming are achieved in thermoplastic polyurethane (TPU)/multi-wall carbon nanotube (MWCNT) composites. With conductive filler distributed in surface layers, the sandwich structure enables sand-structured TPU/MWCNT composites selective EMI shielding performance on account of Fabry−Pérot resonance effect. By using two kinds of TPU with different foaming windows, the bubbles only exist in the middle layer and surface layers keep unfoamed after carbon dioxide (CO2) foaming. Therefore, the EMI shielding performance and shielding peak could be adjusted by regulating the thickness of middle layer under different foaming condition. This effort demonstrates a feasible and effective approach for fabrication of lightweight, flexible, and frequency-selective EMI shielding materials.
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