Fabrication of Extremely Tough, Self-Healing, Environmentally Stable Hyaluronic Acid and Polyacrylamide-Based Organogel and Its Application as Multifunctional Flexible Strain and Pressure Sensors

Conductive hydrogels have emerged as superior candidates for flexible electronics owing to their flexibility, biocompatibility, and self-healing properties. Nonetheless, challenges persist, including water evaporation upon exposure to air, leading to a reduction in flexibility. Moreover, conventional hydrogels rapidly absorb water, resulting in permanent destruction of their structure and electrical characteristics. Organogels have emerged as a viable solution to address these limitations. Herein, a multifunctional organogel was synthesized via the solvent exchange method, exhibiting outstanding stretchability, remarkable environmental stability, and good self-healing properties. The HA 3 PAmSm-PG organogel demonstrated a toughness of 2.45 MJ m −3 , an elongation at break of 1621%, and a tensile strength of 0.258 MPa. Furthermore, a HA 3 PAmSm-PG organogel-based multifunctional strain sensor was constructed, which showed excellent ability for real-time motion detection, underwater finger flexion motion sensing, and gesture recognition of humans by monitoring the movements of humans with outstanding sensitivity and accuracy even in multiple environments, such as in air and water. Moreover, a HA 3 PAmSm-PG organogel-based pressure sensor was constructed, displaying exceptional efficiency in the immediate detection of handwritten mathematical digits and English letters. This versatile organogel showed excellent potential in multifunctional human–machine interaction and human health monitoring applications.