Figure 4.

Temperature and mechanical characteristics of an ultraflexible thermistor. a) A photograph of the mesh thermistor on an ultrathin film substrate. b) Ultrathin thermistor characteristics in the flat and bent states. Inset: a photograph of the thermistor wrapped around the needle during measurement. c) Illustration of the prestretching method. d) Cross‐sectional SEM image of the wrinkled thermistor. e) Change in resistance during cyclic stretching tests. Inset: Photographs of the wrinkled thermistor at 0% and 25% strains. f) Change in the resistance of wrinkled thermistor as a function of temperature after 200 stretching tests.