High Endurance Flexible Humidity Sensor Based on Ammonia Composite Conductive Fibers for Moisture Detection

Environmental monitoring under harsh conditions of high temperature and humidity is crucial for ensuring the reliability and stability of equipment systems, with the development of highly sensitive sensors being particularly significant. However, high-sensitivity sensors used for monitoring such harsh environments often suffer from poor durability and weak stability. To address the issues of susceptibility and performance fluctuation of high-sensitivity sensors in adverse environments, this study has developed $\text{Cu} / \text{Ag}$ complex inks based on the principle of metal-ammonia complexation. These inks were then utilized to fabricate integrated flexible humidity sensors with thermal and humidity resistance through electrohydrodynamic directwriting. The flexible humidity sensors, composed of $\text{Cu} / \text{Ag} / \text{PEO}$ conductive fibers, exhibit excellent humidity response ranges and resistance to thermal and humid environments, enabling persistent humidity monitoring in complex spaces and harsh environments. They can be applied in constructing pipeline anomaly alarm systems and humidity monitoring systems for distribution boxes, demonstrating their potential for application in the field of smart industries.