Journal
ADVANCED SCIENCE
Volume 4, Issue 5, Pages -Publisher
WILEY
DOI: 10.1002/advs.201600404
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Funding
- China Postdoctoral Science Foundation [2015M571837]
- Natural Science Foundation of Jiangsu Province [BK20150364]
- National Natural Science Foundation of China [61574163]
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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 degrees 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.
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