Scalable manufacturing of flexible and highly conductive Ti 3 C 2 T x /PEDOT:PSS thin films for electromagnetic interference shielding

The ever-increasing proliferation of miniaturized and wearable electronics demands lightweight and easy-to-process electromagnetic interference (EMI) shielding materials. Herein, we develop flexible micrometer-thick Ti 3 C 2 T x /poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) nanocomposite films with exceptional electrical conductivity and shielding effectiveness, and with sufficiently uniform thickness. In particular, a ∼7 μm-thick nanocomposite film containing 25 wt% PEDOT:PSS has an exceptional electrical conductivity of 2900 ± 400 S cm −1 and an EMI shielding effectiveness of 55.4 dB after a co-treatment with sulfuric acid and methanol. To the best of our knowledge, this is the highest electrical conductivity ever reported for MXene-based polymer nanocomposites. Besides, the thin film possesses a specific EMI shielding effectiveness of 38 079 dB cm 2 g −1 , which is among the highest values for conductive polymer nanocomposites. The inclusion of PEDOT:PSS endows great film-forming ability to Ti 3 C 2 T x suspensions and hampers unwanted phenomena such as the coffee-ring effect. We also implement a wet-transfer approach to form Ti 3 C 2 T x /PEDOT:PSS nanocomposite films on complex geometries with curves, angles, and corners, which not only opens up new opportunities for developing EMI shields on complex geometries but also offers a feasible pathway for developing flexible and wearable electronics.