Improving electronics stability via covalent-linked interfaces for ultra-robust pressure sensing array

There is an urgent need for developing ultra-stable sensors with robust interfacial connections to promote the progress of intelligent technology. Here we propose a strategy for fabricating porous sensors with covalent-linked interfaces, which significantly improve the device's mechanical and environmental stability. By endowing the polymer reactive siloxane group for further dehydration and condensation process, the modified polymer can on one hand form interface covalent Ti-O-Si bonds with hydroxyl-rich MXene nanosheets for improved interfacial adhesion, and on the other hand, form internal self-condensed Si-O-Si bonds for strengthened mechanical resilience. Owing to the firmly undetached conductive materials, the resulting sensor can maintain stable signal output, and survive harsh conditions including repeated mechanical compression and rigorous water and acid washing. These features make the covalent-linked sensor feasible for human sitting posture monitoring over prolonged periods and spatial distribution detection in various complicated operation scenarios.