Highly Stable Cross-Linked Cationic Polyacrylamide/Ti3C2Tx MXene Nanocomposites for Flexible Ammonia-Recognition Devices

Although ammonia gas sensor research has been developed for a long time, room temperature flexible ammonia gas sensors with high sensitivity and selectivity are still hot research topics. 2D transition metal carbides and nitrides (MXenes) have combined their versatile surface chemistry and high metal conductivity to show their enormous sensing potential. Herein, developing a room temperature nanocomposite based on 2D MXenes materials and cationic polyacrylamide (CPAM) with high gas response and flexibility targeting the construction of high-performance ammonia sensors is focused on. Thanks to the hydrogen bond composition, ohmic contact with the interdigitated electrodes, and excellent mechanical properties, the CPAM/Ti 3 C 2 T x -based ammonia sensors exhibit high ammonia selectivity, faster response–recovery rate (12.7/14.6 s), excellent flexibility, and long-term mechanical stability at room temperature. The synthesis of the CPAM/Ti 3 C 2 T x nanocomposites offers a lasting inspiration for developing high-performance flexible gas sensors.