ABSTRACT Hydrogel‐based flexible sensors have promising applications in wearable devices, electronic skin, and smart medical devices. However, the preparation of hydrogel sensors for multifunctional sensing is still a challenging task. In this paper, Polyvinyl alcohol/Poly (acrylic acid‐N‐isopropyl acrylamide)‐Fe 3+ (PVA/P(AA‐NIPAM)‐Fe 3+ ) dual‐network multifunctional hydrogels were obtained by monomer copolymerization and ionic cross‐linking. The hydrogel not only has good mechanical properties (tensile strength: 1.91 ± 0.05 MPa, maximum elongation: 475 ± 27%), but also achieves sensing properties to stress, pressure, temperature, and pH. The sensitivity to stress was 3.77, and the response time was 90 ms. There is also a distinguishable signal output for pressure and a good linear correlation for temperature and pH sensing. The construction of this hydrogel provides a new example for the development of multifunctional hydrogel sensors.
Du et al. (Fri,) studied this question.