Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Development of a Polyurethane-Based Ion Selective Sensor for Lithium-Ion Measurement and Comparison Study with a Polyvinyl Chloride-Based Sensor

리튬 이온 측정을 위한 Polyurethane 기반 이온선택성 센서의 개발 및 Polyvinyl Chloride 기반 센서와의 성능 비교

  • Su Bin Yun (Department of Chemical Engineering, Kangwon National University) ;
  • Ju Ha Park (Department of Chemical Engineering, Kangwon National University) ;
  • Kyoung G. Lee (Center for Nano Bio Development, National Nanofab Center) ;
  • Bong Gill Choi (Department of Chemical Engineering, Kangwon National University)
  • 윤수빈 (강원대학교(삼척캠퍼스) 에너지화학공학과) ;
  • 박주하 (강원대학교(삼척캠퍼스) 에너지화학공학과) ;
  • 이경균 (나노종합기술원 나노바이오센터) ;
  • 최봉길 (강원대학교(삼척캠퍼스) 에너지화학공학과)
  • Received : 2025.08.25
  • Accepted : 2025.09.09
  • Published : 2025.10.10
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Abstract

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.

본 연구에서는 나노기둥(nanopillar) 구조의 작동 전극과 Ag/AgCl 기준 전극으로 구성된 2전극 시스템 기반의 고체접촉형 리튬 센서를 제작하였다. 가소제를 첨가하지 않고 제조한 polyurethane (PU) 센서는 60.80 mV/dec의 높은 민감도를 나타내었다. 이와 대조적으로, 동일 조건의 polyvinyl chloride (PVC) 센서는 낮은 민감도를 나타내었다. 이후 해당 PU 센서를 반복 굽힘과 전기화학적 성능 시험 평가 결과, 센서의 성능 저하 없이 기계적 안정성이 유지되었다. PU 센서는 리튬이온 선택도에서도 PVC 센서보다 우수한 특성을 보여주었다. PU 센서를 이용하여 폐수 및 염수 모사 환경에서 1% 이내의 오차로 리튬을 정밀하게 감지하였다.

Keywords

Acknowledgement

This work was supported by Nano Open Innovation Lab Cooperation Project of NNFC in 2025.

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