This paper reports a fast, linear, all-range sensitive and biocompatible humidity sensor using polylactic glycolic acid (PLGA) as a sensing layer for the first time. The device is fabricated using all printing methods. The high definition interdigitated electrode structure was printed on a flexible PET substrate by reverse offset printing setup using silver ink, while PLGA ink was deposited using spin coating. IDEs with two different dimensions were printed with three samples of each. The output of the sensor is impedance which decreases with an increase in relative humidity in a controlled chamber. The results show excellent stability, the obvious response to RH for full range from 0 to 100 %RH with fast response time of 3 s and a recovery time of 6 s. Sensor data can be received continuously using smartphone with a Wi-Fi connection with ESP8266 MCUNODE. Sensor’s flexibility test was also performed for 5 mm mechanical bending radius which showed reasonable consistency with results of flat sensor. The biocompatibility of the sensor’s active layer was analyzed and confirmed by culturing human small airway epithelial cells for 7 days. To utilize the sensor’s feature of being biocompatible, it was then used for human respiration monitoring which enabled the proposed device to be a strong candidate for wearable electronics and health monitoring applications.
- Post author:afaquemanzoor
- Post published:March 15, 2020
- Post category:Research Papers
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