Multifunctional TPU/CNT Films with Mushroom-Like Structures for High Performance EMI Shielding, Efficient Deicing, and Recyclability

Abstract

Frequent extreme weather events have stimulated the pursuit of sustainable substitutes for conventional electromagnetic interference (EMI) shielding materials, which often suffer from insufficient environmental stability and poor reusability. Herein, we present a durable, high-performance EMI shielding film that integrates de-icing functionality with recyclability. By combining non-solvent-induced phase separation with hot-pressing transfer techniques, a thermoplastic polyurethane/carbon nanotube (TPU/CNT) film with a mushroom-like structure is successfully fabricated. The pattern structure endows the obtained film with excellent hydrophobic properties and EMI shielding performance in 8.2-26.5 GHz frequency range. At a CNT loading of 30 wt%, the EMI shielding effectiveness (EMI SE) in the X-band reaches 72.85 dB, alongside good mechanical strength of 17.1 MPa. More importantly, the inherent photothermal and electrothermal properties of CNTs network, combined with the microstructured surface, endow the composite film with rapid de-icing capabilities under both solar and electrical stimulation, achieving efficient and residue-free performance. Furthermore, the TPU/CNT film exhibits efficient recyclability through dissolution and reprocessing, with the majority of its shielding performance preserved upon subsequent reuse. This work provides a scalable strategy for the development of lightweight, recyclable, and multifunctional EMI shielding materials capable of withstanding harsh and cold environments.