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Temperature Sensor with a Water-Dissolvable Ionic Gel for Ionic Skin 50811634 山田, 駿介 ヤマダ, シユンスケ Yamada, Shunsuke Toshiyoshi, Hiroshi This document is the unedited author's version of a Submitted Work that was subsequently accepted for publication in ACS Applied Materials & Interfaces, Copyright (c) American Chemical Society after peer review. To access the final edited and published work, see https://doi.org/10.1021/acsami.0c10229. temperature sensor ionic liquid poly(vinyl alcohol) electrical double layer water dissolvable In the era of a trillion sensors, a tremendous number of sensors will be consumed to collect information for big data analysis. Once they are installed in a harsh environment or implanted in a human/animal body, we cannot easily retrieve the sensors; the sensors for these applications are left unattended but expected to decay after use. In this paper, a disposable temperature sensor that disappears with contact with water is reported. The gel electrolyte based on an ionic liquid and a water-soluble polymer, so-called ionic gel, exhibits a Young’s modulus of 96 kPa, which is compatible with human muscle, skin, and organs, and can be a wearable device or in soft robotics. A study on electrical characteristics of the sensor with various temperatures reveals that the ionic conductivity and capacitance increased by 12 times and 4.8 times, respectively, when the temperature varies from 30 to 80 °C. The temperature sensor exhibits a short response time of 1.4 s, allowing real-time monitoring of temperature change. Furthermore, sensors in an array format can obtain the spatial distribution of temperature. The developed sensor was found to fully dissolve in water in 16 h. The water-dissolvability enables practical applications including healthcare, artificial intelligence, and environmental sensing. American Chemical Society 2020-07-07 eng journal article AM http://hdl.handle.net/10228/0002000732 https://kyutech.repo.nii.ac.jp/records/2000732 https://doi.org/10.1021/acsami.0c10229 1944-8244 1944-8252 ACS Applied Materials & Interfaces 12 32 36449 36457 https://kyutech.repo.nii.ac.jp/record/2000732/files/10430575.pdf application/pdf 2.4 MB 2024-06-05