Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Surface Modification of Gold Electrode Using Nafion Polymer and Its Application as an Impedance Sensor for Measuring Osmotic Pressure

나피온 폴리머를 이용한 금 전극의 표면 개질 및 이의 삼투압 측정용 임피던스 센서 응용

  • Min Sik, Kil (Department of Chemical Engineering, Kangwon National University) ;
  • Min Jae, Kim (Department of Chemical Engineering, Kangwon National University) ;
  • Jo Hee, Yoon (Department of Chemical Engineering, Kangwon National University) ;
  • Jinwu, Jang (Department of Chemical Engineering, Kangwon National University) ;
  • Kyoung G., Lee (National Nanofab Center, Center for Nano Bio Development) ;
  • Bong Gill, Choi (Department of Chemical Engineering, Kangwon National University)
  • 길민식 (강원대학교(삼척캠퍼스) 화학공학과) ;
  • 김민재 (강원대학교(삼척캠퍼스) 화학공학과) ;
  • 윤조희 (강원대학교(삼척캠퍼스) 화학공학과) ;
  • 장진우 (강원대학교(삼척캠퍼스) 화학공학과) ;
  • 이경균 (나노종합기술원 나노바이오센터) ;
  • 최봉길 (강원대학교(삼척캠퍼스) 화학공학과)
  • Received : 2022.11.15
  • Accepted : 2022.12.06
  • Published : 2023.02.10
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Abstract

In this work, we developed a Nafion polymer-coated impedance sensor with two gold electrode configurations to measure the ion concentration in solution samples. The gold electrodes were fabricated through the sputtering process, followed by surface modification using Nafion polymer. The resulting sensors enable the prevention of the polarization phenomenon on the electrode surface, resulting in stable measurement of electrochemical signals. Spectroscopy and scanning electron microscopy measurements revealed that the thin film of Nafion was coated uniformly onto the surface of the gold electrode. The Nafion-coated sensor exhibited more stable impedance signals than the conventional gold electrode. It showed a highly reliable calibration curve (R2 = 0.983) of the impedance sensor using a standard sodium chloride solution. In addition, a comparison experiment between the impedance sensor and a commercial conductivity sensor was performed to measure the ion concentration of artificial tears, showing similar results for the two sensors.

본 논문에서는 용액의 이온 농도 측정이 가능한 나피온 폴리머(Nafion polymer) 코팅 기반 2상 금 전극의 임피던스(Impedance) 센서를 개발하였다. 스퍼터링(Sputtering) 공정을 통해서 제작된 금 전극의 표면을 나피온 폴리머를 사용하여 표면 개질 하였다. 상기 제작된 전극은 분극 현상 제어가 가능하여 전기화학적 신호를 안정적으로 측정할 수 있도록 하였다. 분광학과 전자주사현미경 관찰을 통하여 박막의 나피온 폴리머 코팅을 확인하였다. 나피온 코팅이 된 전극은 기존 금 전극에 비해 안정적인 임피던스 신호를 보여 주었으며, 표준 염화나트륨(NaCl) 용액 사용 시 임피던스 센서의 신뢰성 높은 검정 곡선(R2 = 0.983)을 나타내었다. 또한, 임피던스 센서는 상용화 전도도 장치와 인공 눈물의 이온 농도 측정 비교 실험을 진행하였으며, 유사한 결과값을 확인하였다.

Keywords

Acknowledgement

이 성과는 2020년도 정부(미래창조과학부)의 재원으로 한국연구재단의 지원을 받아 수행된연구임. (NRF-2021R1A2C1009926).

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