Sandwich‐Structured Organogel with Asymmetric‐Adhesion and Adaptive Optical Regulation for Simultaneous Sensing of Human Motion and Temperature Without Interference
Sijia Ge, Shinian Liu, Ying Kong, Zhong-Ze Gu, Hua Xu
Abstract
Abstract The application of these NIPAm‐based temperature‐sensitive hydrogels in wearable sensing is limited by the inability to achieve a long‐lasting temperature response and adaptive optical regulation due to water loss in the hydrogel, the inability to avoid the phenomenon of detachment due to the external touch, and the mutual interference between temperature and stress signals. Here, sandwich‐structured organogel sensors (SOGS) are prepared based on solvent modulation and interfacial fusion cross‐linking strategies to achieve asymmetric‐adhesion, adaptive optical regulation, and simultaneous sensing of human motion and temperature without interference between the sensing signals. Modulation of temperature‐sensitive properties through hydrogen bonding between glycol and amide groups for long‐term temperature sensing (10–30 °C) and adaptive infrared and ultraviolet regulation. Adhesive conductive organogel is introduced under the temperature‐sensitive organogel by an interfacial fusion cross‐linking strategy for unilateral interfacial adhesion (67.28 kPa for pig skin) and stress sensing. The intermediate interfacial layer prevents the mutual interference between temperature and stress sensing signals. In conclusion, the solvent modulation strategy provides a new idea for developing novel temperature responsive gels, and the interfacial fusion cross‐linking strategy provides a facile method for developing unilaterally adherent, interference‐resistant, and multifunctional wearable sensors.