Biodegradable Temperature Sensors with Enhanced Sensitivity Using Bioderived Ionic Liquid with Sodium Ions
Shunsuke Yamada, Takashi Honda
TL;DR
This paper introduces a biodegradable temperature sensor using a sodium-doped ionic liquid to improve sensitivity for healthcare and environmental monitoring.
Contribution
The novel use of sodium-doped choline lactate ionic liquid significantly enhances the temperature coefficient of resistance in biodegradable sensors.
Findings
The Na-doped ionic gel achieved a thermal index of 7563 K and a TCR of 8.4%/K.
The sensor degraded in phosphate-buffered solution over 48 days, leaving only the encapsulation layer.
Enhanced intermolecular interactions from Na doping improve sensor sensitivity.
Abstract
Gels promise the development of flexible sensors for electronic and ionic skins owing to their high affinity for human skin, making them ideal for biomedical monitoring. Bioderived ionic liquids and their gels possess favorable physical and electrochemical characteristics, including extremely low vapor pressure, high ionic conductivity, and biodegradability, which suit applications of transient electronics requiring the autonomous decomposition of materials. However, their low temperature coefficient of resistance (TCR) may hinder the use of bioderived ionic liquids in wearable devices, implants, and environmental sensing. To address this issue, we doped sodium (Na) ions into the bioderived ionic liquid choline lactate to enhance its TCR for biodegradable temperature sensors. The Na ions improve the coupling of choline and lactate, resulting in a Na-doped ionic liquid with a high TCR,…
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Taxonomy
TopicsAdvanced Sensor and Energy Harvesting Materials · Conducting polymers and applications · Advanced Chemical Sensor Technologies