Abstract
A highly flexible porous ionic membrane (PIM) is fabricated from a polyvinyl alcohol/KOH polymer gel electrolyte, showing well-defined 3D porous structure. The conductance of the PIM changes more than 70 times as the relative humidity (RH) increases from 10.89% to 81.75% with fast and reversible response at room temperature. In addition, the PIM-based sensor is insensitive to temperature (0–95 °C) and pressure (0–6.8 kPa) change, which indicates that it can be used as highly selective flexible humidity sensor. A noncontact switch system containing PIM-based sensor is assembled, and results show that the switch responds favorably to RH change caused by an approaching finger. Moreover, an attachable smart label using PIM-based sensor is explored to measure the water contents of human skin, which shows a great linear relationship between the sensitivity of the sensor and the facial water contents measured by a commercial reference device.
| Original language | English |
|---|---|
| Article number | 1600404 |
| Journal | Advanced Science |
| Volume | 4 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - May 1 2017 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2017 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
ASJC Scopus Subject Areas
- Medicine (miscellaneous)
- General Chemical Engineering
- General Materials Science
- Biochemistry, Genetics and Molecular Biology (miscellaneous)
- General Engineering
- General Physics and Astronomy
Keywords
- flexible sensors
- humidity sensors
- polymer electrolytes
- polyvinyl alcohol
- porous ionic membranes