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Open AccessArticle

Enhanced Moisture-Reactive Hydrophilic-PTFE-Based Flexible Humidity Sensor for Real-Time Monitoring

School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon 16419, Korea
Korea Electronics Technology Institute, Gyeonggi 13488, Korea
Division of Electrical and Computer Engineering, Electrical Engineering Building, Louisiana State University, Baton Rouge, LA 70809, USA
Device & System Research Center, Samsung Advanced Institute of Technology, Suwon 443-803, Korea
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Sensors 2018, 18(3), 921;
Received: 11 February 2018 / Revised: 10 March 2018 / Accepted: 16 March 2018 / Published: 20 March 2018
(This article belongs to the Special Issue Thin-Film Transistors for Biomedical and Chemical Sensing)
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. View Full-Text
Keywords: flexible humidity sensor; hydrophilic polytetrafluoroethylene (H-PTFE); real-time monitoring flexible humidity sensor; hydrophilic polytetrafluoroethylene (H-PTFE); real-time monitoring
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Park, H.; Lee, S.; Jeong, S.H.; Jung, U.H.; Park, K.; Lee, M.G.; Kim, S.; Lee, J. Enhanced Moisture-Reactive Hydrophilic-PTFE-Based Flexible Humidity Sensor for Real-Time Monitoring. Sensors 2018, 18, 921.

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