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Water‐Saturated Ion Gel for Humidity‐Independent High Precision Epidermal Ionic Temperature Sensor SCIE SCOPUS

Title
Water‐Saturated Ion Gel for Humidity‐Independent High Precision Epidermal Ionic Temperature Sensor
Authors
Kim, Hyun WooEUNSEO, KIMOh, JoosungLee, HyominJeong, Unyong
Date Issued
2022-01
Publisher
Wiley-VCH Verlag
Abstract
Although ion gels are attractive sensing materials for deformable epidermal sensors or implantable devices, their sensing performances are highly affected by environmental humidity change, so that their sensing reliability cannot be secured. This study proposes a new concept of maintaining the high-precision temperature sensing performance of highly deformable ion gel sensors. In this approach, a hydrophobic ion gel sensing layer is kept water-saturated by attaching a hydrogel layer, rather than attempting to completely block water penetration. This study performs experimental and theoretical investigation on water concentration in the ion gel, using the analysis of mass transportation at the interface of the ion gel and the hydrogel. By using the charge relaxation time of the ionic molecules, the temperature sensor is not affected by environmental humidity in the extreme range of humidity (30%–100%). This study demonstrates a highly deformable on-skin temperature sensor which shows the same performance either in water or dry state and while exercising with large strains (ε = 50%).
URI
https://oasis.postech.ac.kr/handle/2014.oak/112448
DOI
10.1002/advs.202200687
ISSN
2198-3844
Article Type
Article
Citation
Advanced Science, 2022-01
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정운룡JEONG, UNYONG
Dept of Materials Science & Enginrg
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