Conductive Hydrogels with Ultrastretchability and Adhesiveness for Flame- and Cold-Tolerant Strain Sensors

• DOI: 10.1021/acsami.2c07501
• Publication Date: 2022-05-24T16:34:56Z
• Authors: Cuiwen Liu; Ru Zhang; Peiwen Li; Jinqing Qu; Pengjie Chao; Zongwen Mo; Tao Yang; Ning Qing; Liuyan Tang
• Keywords: Gauge factor; Strain (injury); Atmospheric temperature range

Hydrogel strain sensors with extreme temperature tolerance have recently gained great attention. However, the sensing ability of these hydrogel changes temperature, resulting in variety output signals that causes signal distortion. In this study, double-network hydrogels comprising SiO2 nanoparticles composed polyacrylamide and phytic acid-doped polypyrrole were prepared applied on a wide range, high adhesiveness, invariable sensitivity under flame cold environments. The had stable conductivity, excellent adhesive strength up to 79.7 kPa various substrates, elongation 1896% at subzero after heating. They also exhibited effective retardancy low surface (71.2 °C) 1200 s heating (200 antifreezing properties -20 °C. Remarkably, even heat treatment, hydrogel-based sensor displayed consistent behaviors detecting human motions broad range (up 500%) steady gauge factor (GF, ∼2.90). Therefore, work paves way for applications robotic skin, human-mechanical interfaces, health monitoring devices harsh operating