Mechanically Compatible Sealing of Hydrogel with Coherent Interface

by a thermal treatment. This tough interface, together with the intrinsically low water vapor transmission rate of SIBS, allows the sealed hydrogel to maintain its modulus and stretchability after 10 days of drying in air. The sealed hydrogel is chemically and mechanically stable under harsh conditions, including acidic/alkaline/salty solutions, high temperatures, and cyclic mechanical deformation. This strategy applies to various hydrogels with diverse compositions and structures, leading to orders of magnitude improvements in the longevity of hydrogel-based electronic devices.