Confinement Effect Enhanced Ultra‐Low Temperature Tolerance in Organo‐Hydrogels with High Electrical Conductivities for Soft Electronics

Abstract Conducting organo‐hydrogels is promising for soft electronics applications. However, conventional organo‐hydrogels typically exhibit low electrical conductivity (<5 S cm −1 ) at subzero temperatures (←20 °C), severely limiting their utility in low‐temperature soft electronics. In this work, a PEDOT:PSS‐based all‐polymer organo‐hydrogel are developed with ultralow‐temperature tolerance down to −90 °C and record high electrical conductivity up to 698.3 ± 37.3 S cm −1 . The high electrical conductivity is due to a developed preparation method and the ultra‐low temperature tolerance property is attributed to the suppression of the coagulation of the organo‐hydrogel with alcohols as well as the confinement effects of the porous structure existing in the hydrogel films. The obtained highly conductive organo‐hydrogel films exhibit high performance in thermoelectrics, electromagnetic interference shielding, and stretchable strain sensors in subzero temperatures. A thermal driven grabber has been fabricated to demonstrate the good flexibility, the good strain–stress property, and the good Joule‐heating ability of the conducting organo‐hydrogels at low temperatures. This work extends the operational temperature limits of organo‐hydrogel electronics to extreme cold environments (>−90 °C).