Zhang Longzhou, Ma Baoyuan, Xu Zhiguang, Zhao Yan
College of Textile and Clothing Engineering, Soochow University, Suzhou 215123, China.
College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing 314001, China.
Polymers (Basel). 2025 Feb 28;17(5):663. doi: 10.3390/polym17050663.
Wearable, non-invasive sweat sensors capable of continuously monitoring the pH of sweat, which is a key indicator related to metabolism and homeostasis level, are highly desirable for personal health management. However, ensuring the stability and accuracy of these sensors can be challenging when the body is in motion. In this work, we prepared a stretchable nanofibrous membrane-based electrochemical pH-sensing electrode by embedding carbon nanotubes (MWCNT) and silver nanowires (AgNWs) into an elastic electrospun nanofibrous membrane, followed by polyaniline electrodeposition. The as-prepared pH-sensing electrode showed a high sensitivity of 82.53 mV/pH and high accuracy in ionic solutions with pH ranging from 3 to 7. Notably, the electrode maintained stable sensing performance under deformations, including torsion, bending, and tensile strains up to 30%. Even after 1000 cycles of stretching at a 30% tensile strain, the detection sensitivity remained above 70 mV/pH, indicating its potential application as a wearable electrochemical sensor for monitoring sweat pH in personal health management.
能够持续监测汗液pH值的可穿戴式无创汗液传感器非常适合个人健康管理，因为汗液pH值是与新陈代谢和体内平衡水平相关的关键指标。然而，当身体处于运动状态时，确保这些传感器的稳定性和准确性可能具有挑战性。在这项工作中，我们通过将碳纳米管（MWCNT）和银纳米线（AgNWs）嵌入弹性电纺纳米纤维膜中，然后进行聚苯胺电沉积，制备了一种基于可拉伸纳米纤维膜的电化学pH传感电极。所制备的pH传感电极在pH值为3至7的离子溶液中表现出82.53 mV/pH的高灵敏度和高精度。值得注意的是，该电极在包括扭转、弯曲和高达30%的拉伸应变等变形条件下仍保持稳定的传感性能。即使在30%拉伸应变下进行1000次拉伸循环后，检测灵敏度仍保持在70 mV/pH以上，表明其作为可穿戴电化学传感器在个人健康管理中监测汗液pH值的潜在应用。
