Dual-Stimuli-Responsive and Anti-Freezing Conductive Ionic Hydrogels for Smart Wearable Devices and Optical Display Devices

Stimuli-responsive hydrogels are a class of importantmaterialsfor the preparation of flexible sensors, but the development of UV/stressdual-responsive ion-conductive hydrogels with excellent tunabilityfor wearable devices remains a major challenge. In this study, a dual-responsivemultifunctional ion-conductive hydrogel (PVA-GEL-GL-Mo-7) with high tensile strength, good stretchability, outstanding flexibility,and stability is successfully fabricated. The prepared hydrogel hasan excellent tensile strength of 2.2 MPa, high tenacity of 5.26 MJ/m(3), favorable extensibility (522%), and high transparency of90%. Importantly, the hydrogels have dual responsiveness to UV lightand stress, allowing it to be used as a wearable device while respondingdifferently to the UV intensity of different outdoor environments(hydrogels can show different levels of color when exposed to differentlight intensities of UV light) and can remain flexible at -50and 85 degrees C (sensing at both -25 and 85 degrees C). Therefore,the hydrogels developed in this study have good prospects in differentapplications, such as flexible wearable devices, duplicate paper,and dual-responsive interactive devices.