Super anti-freezing, fast-responsive nanocomposite organohydrogels with excellent mechanical properties as multifunctional sensors for human motion monitoring

Conventional hydrogel sensors are always restricted in real applications due to weakness in mechanical properties , freezing and dehydration ability, as well as limited sensing functionality. Herein, a multifunctional nanocomposite organohydrogel is constructed by polyvinyl alcohol, tannic acid green reduction of graphene oxide with ethylene glycol-water (EG/H 2 O) binary solvent through a common freezing-thawing process to overcome the above challenges. The organohydrogel shows favorable stretchability (369%), tensile toughness (up to 1850.48 KJ/m3) and strength (tensile/compressive strength of 603 kPa/2181.63 kPa). Meanwhile, it exhibits a super anti-freezing (−133.7 °C) and moisturizing performance. As multifunctional sensors (strain/pressure/temperature sensors), it shows stable and sensitive detection in a large temperature range, and fast response (66 ms/5 ms as a strain/pressure sensor respectively). This high-performance multifunctional organohydrogel shows promising potential in flexible electronic devices, electronic skin and soft robots.