Large-scalable, flexible and durable MXene/gelatin composite film for electromagnetic shielding and self-powered sensing

The increasingly serious electromagnetic radiation and electronic waste pose a significant threat to public health and the operation of electronic devices. Despite the enormous potential of highly conductive Ti3C2Tx MXenebased electromagnetic interference (EMI) shielding materials, significant challenges persist in terms of mechanical flexibility and antioxidation. In this study, it was firstly proposed for a scalable method to prepare MXene Ti3C2Tx/gelatin/sodium lignosulphonate (MXene/GEL/SL) films with good biodegradability, and Fe3+ ions were introduced to enhance cross-linking degree and stabilize the gelatin matrixes, which endowed the films with mechanical flexibility and durability. The film (MXene content: 30 wt%) has a thickness of merely 0.08 mm, exhibiting a high SE/d value of 432 dB/mm and maintaining its good EMI shielding performance even after being soaked in water for 15 days. Additionally, the film-based triboelectric nanogenerator (TENG) even in 85 % humidity manifest excellent open-circuit voltage (230 V), short-circuit current (28 mu A) and power density (2.9 W/m2), respectively. Also, the TENG demonstrates good utility as a self-powered sensor when attached to different parts of human body to monitor human health. Therefore, the as-developed MXene/GEL/SL film presents good application prospects in the fields of both electromagnetic shielding and self-powered sensing for wearable electronics.