Development of a Polyurethane-Based Ion Selective Sensor for Lithium-Ion Measurement and Comparison Study with a Polyvinyl Chloride-Based Sensor

초록

In this study, we fabricated a solid-contact lithium sensor using a two-electrode system consisting of a nanopillar-structured working electrode and an Ag/AgCl reference electrode. The polyurethane (PU)-based sensor, prepared without plasticizer, exhibited a high sensitivity of 60.80 mV/dec. In contrast, the polyvinyl chloride (PVC)-based sensor showed no significant response under the same conditions as the PU-based sensor. Combined mechanical and electrochemical tests revealed that the PU-based sensor retained its sensor performance. In addition, the PU sensor, compared to the PVC sensor, exhibited superior selectivity for lithium-ion detection against other interfering ions. The resulting PU sensor accurately detects lithium-ion concentration with less than 1% error in simulated wastewater and brine environments.

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