Flexible, Stretchable,\nand Transparent MXene Nanosheet/Thermoplastic\nPolyurethane Films for Multifunctional Heating and Electromagnetic\nInterference Shielding

Abstract

The development of multifunctional electromagnetic interference\n(EMI) shielding films with optical transparency is highly urgent as\nvisual windows in modern optoelectronic devices. Herein, Ti₃C₂T_<i>x</i> nanosheet (MXene)-based\ntransparent conductive films (TCFs) with thermoplastic polyurethane\n(TPU) as substrates were prepared by simple spraying, which was further\napplied in high-performance EMI shielding, Joule heating, and photothermal\nconversion. The comprehensive properties of the transparent MXene/TPU\nfilms can be optimized by adjusting the thickness of the MXene layer.\nThe optimal TCF showed a sheet resistance of 119.1 Ω/sq, a transmittance\nof 43.1%, and an average EMI shielding effectiveness of 10.9 dB. Meanwhile,\nthis TCF exhibited a stable EMI shielding performance to resist bending\nand stretching. Moreover, the multifunctional MXene/TPU film presented\nremarkable thermal management performances, including Joule heating\n(89.4 °C @ 7 V) and photothermal conversion (72 °C @ 100\nmW/cm²) abilities. This work presents flexible and stretchable\nMXene-based TCFs with satisfactory EMI shielding performance and multisource\nthermal response behavior, which is promising for various transparent\nand flexible electronic devices.