Enhanced moisture-reactive hydrophilic-PTFE-based flexible humidity sensor for real-time monitoring
Flexible sensors connected to cell phones are a promising technology that can aid in continuously monitoring signals in our daily lives, such as an individual’s health status and information from buildings, farms, and industry. Among such signals, real-time humidity monitoring is crucial to a comfortable life, as human bodies, plants, and industrial environments require appropriate humidity to be maintained. We propose a hydrophilic polytetrafluoroethylene (H-PTFE)-based flexible humidity sensor integrated with readout circuitry, wireless communication, and a mobile battery. To enhance its sensitivity, linearity, and reliability, treatment with sodium hydroxide implements additional hydroxyl (OH) groups, which further enhance the sensitivity, create a strong linearity with respect to variations in relative humidity, and produce a relatively free hysteresis. Furthermore, to create robust mechanical stability, cyclic upward bending was performed for up to 3000 cycles. The overall electrical and mechanical results demonstrate that the flexible real-time H-PTFE humidity sensor system is suitable for applications such as wearable smart devices.
Publication Source (Journal or Book title)
Park, H., Lee, S., Jeong, S., Jung, U., Park, K., Lee, M., Kim, S., & Lee, J. (2018). Enhanced moisture-reactive hydrophilic-PTFE-based flexible humidity sensor for real-time monitoring. Sensors (Switzerland), 18 (3) https://doi.org/10.3390/s18030921