Temperature Sensor with a Water-Dissolvable Ionic Gel for Ionic Skin
Temperature Sensor with a Water-Dissolvable Ionic Gel for Ionic Skin
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DOI：
10.1021/acsami.0c10229
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发表时间：
2020-08-12
影响因子：
9.5
通讯作者：
Toshiyoshi, Hiroshi
中科院分区：
文献类型：
--
作者：
Yamada, Shunsuke;Toshiyoshi, Hiroshi
在万亿传感器时代，将消耗海量的传感器来收集信息进行大数据分析。一旦它们被安装在恶劣的环境中或植入人体/动物体内，我们就无法轻易取回传感器；这些应用的传感器无人看管，但预计在使用后会衰减。在本文中，报道了一种与水接触后消失的一次性温度传感器。基于离子液体和水溶性聚合物的凝胶电解质，即所谓的离子凝胶，其杨氏模量为96 kPa，与人体肌肉、皮肤和器官相容，可用于可穿戴设备或软体机器人。对不同温度下传感器的电特性研究表明，当温度从30℃变化到80℃时，离子电导率和电容分别增加12倍和4.8倍。温度传感器的响应时间短，为1.4秒，可以实时监测温度变化。此外，阵列形式的传感器可以获得温度的空间分布。开发的传感器被发现在 16 小时内完全溶解在水中。水溶性使医疗保健、人工智能和环境传感等实际应用成为可能。
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 degrees 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.