TY - JOUR
T1 - Temperature Sensor with a Water-Dissolvable Ionic Gel for Ionic Skin
AU - Yamada, Shunsuke
AU - Toshiyoshi, Hiroshi
N1 - Funding Information:
This work was supported in part by JST CREST Grant No. JPMJCR15Q4, Japan, JSPS Grant-in-Aid for Research Activity start-up Grant 19K23523, Japan, and the grant funding from the Tateisi Science and Technology Foundation Grant 2187012.
Publisher Copyright:
© 2020 American Chemical Society.
PY - 2020/8/12
Y1 - 2020/8/12
N2 - 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.
AB - 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.
KW - electrical double layer
KW - ionic liquid
KW - poly(vinyl alcohol)
KW - temperature sensor
KW - water dissolvable
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U2 - 10.1021/acsami.0c10229
DO - 10.1021/acsami.0c10229
M3 - Article
C2 - 32633932
AN - SCOPUS:85089708769
SN - 1944-8244
VL - 12
SP - 36449
EP - 36457
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 32
ER -
