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(A) The relative resistance change of the DN hydrogel with the temperature decreasing from 25 °C to −20 °C (the resistance at 25 °C was defined as R0). Inset pictures showed the bulb light’s variation in the circuit connected by the DN hydrogel at 25 °C and −20 °C. (B) The performance comparison of the DN hydrogel sensor at 25 °C and −20 °C. (C) Real-time relative resistance-change curves on multiple tensile strains at −20 °C.
