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Ultrafast Response Polyelectrolyte Humidity Sensor for Respiration Monitoring

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journal contribution
posted on 23.01.2019, 00:00 by Jianxun Dai, Hongran Zhao, Xiuzhu Lin, Sen Liu, Yunshi Liu, Xiupeng Liu, Teng Fei, Tong Zhang
Respiration monitoring is important for evaluating human health. Humidity sensing is a promising way to establish a relationship between human respiration and electrical signal. This work describes polymer humidity sensors with ultrafast response for respiration monitoring. The humidity-sensitive polyelectrolyte is in situ cross-linked on the substrate printed with interdigitated electrodes by a thiol–ene click reaction. The polyelectrolyte humidity sensor shows rapid water adsorption/desorption ability, excellent stability, and repeatability. The sensor with ultrafast response and recovery (0.29/0.47 s) when changing humidity between 33 and 95% shows good application prospects in breath monitoring and touchless sensing. Different respiration patterns can be distinguished, and the breath rate/depth of detection subjects can also be determined by the sensor. In addition, the obtained sensor can sense the skin evaporation in a noncontact way.