A κ-Carrageenan-Containing Organohydrogel with Adjustable Transmittance for an Antifreezing, Nondrying, and Solvent-Resistant Strain Sensor

Gel polymers are widely used in different fields due to their unique properties, especially in flexible electronic devices. However, developing multienvironmentally-tolerant (antifreezing, antidrying, and solvent-resistant) gel polymer-based soft electronics is still a significant challenge. Herein, a binary solvent system-based versatile organohydrogel is designed and successfully prepared, which exhibits superior stretchability, favorable self-adhesive properties, prominent temperature tolerance, and excellent solvent-resistant capabilities. Furthermore, the as-assembled organohydrogel-based sensor demonstrates a satisfied sensitivity (GF = 1.8), wide strain range (5-500%), and outstanding human motion detection. Meanwhile, the obtained organohydrogel can also serve as an all-weather sensor for achieving precise and reliable mechanical sensing in a wide temperature range from -50 to 50 °C and diverse liquid media consisting of water, toluene, and carbon tetrachloride. Interestingly, the organohydrogel displays a repeatable transmittance change behavior in water and dimethyl sulfoxide, based on this feature, which could realize the functional applications for recording and erasing information. It is envisioned that these superior performances render the as-prepared organohydrogel suitable to develop future advanced soft electronics with multienvironmental tolerance.