Effect of Temperature on the Bending Fatigue of a PP/Ag NPs/GO Nonwoven Composite Fabric Pressure Sensor

Abstract Fabric-based flexible pressure sensors are widely studied for monitoring subtle body movements, while their performance degradation during low-temperature cyclic bending remains a major challenge in practical applications. In this study, a polydimethylsiloxane (PDMS)/Ag nanoparticles/graphene oxide (GO) fabric pressure sensor was prepared using a dip-coating method to investigate temperature-dependent fatigue properties. The results indicated that, under the same number of bending cycles at −40 °C, the attenuation of the sensing response was twice as high as that at 20 °C, which was attributed to the performance degradation induced by the disruption of hydrogen bonds and π–π stacking synergistic network. The suppressed reorganization of O–H···N hydrogen bonds at the PDMS/polydopamine interface under low-temperature cyclic bending conditions exacerbates the liberation of residual stress, while the inability of adjacent GO layers to redistribute localized stresses via parallel π–π slippage collectively triggered interfacial debonding.