Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Surface Modification of a Screen-printed Carbon Electrode with Iridium Oxide and Its Application of an Impedance Sensor

스크린 프린팅 탄소 전극의 이리듐 산화물 표면 개질과 이의 임피던스 센서 응용

  • Min Sik Kil (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) ;
  • Bong Gill Choi (Department of Chemical Engineering, Kangwon National University)
  • 길민식 (강원대학교(삼척캠퍼스) 에너지화학공학과) ;
  • 윤조희 (강원대학교(삼척캠퍼스) 에너지화학공학과) ;
  • 장진우 (강원대학교(삼척캠퍼스) 에너지화학공학과) ;
  • 최봉길 (강원대학교(삼척캠퍼스) 에너지화학공학과)
  • Received : 2023.05.28
  • Accepted : 2023.07.19
  • Published : 2023.10.10
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Abstract

In this study, we developed an impedance sensor capable of controlling electrode polarization by coating iridium oxide (IrOx) on the surface of the screen-printed carbon electrode. IrOx was deposited on the surface of carbon electrodes according to the number of cycles (0~50 cycles) by cyclic voltammetry. Observation of scanning electron microscope images revealed that the size and number of IrOx particles increased as the number of cycles increased. The changes in impedance responses as a function of the NaCl concentration of the as-obtained sensors were investigated using electrochemical impedance spectroscopy. The sensors manufactured in 50 cycles exhibited the best coefficient of determination and reproducibility, attributed to the well-controlled electrode polarization. We further demonstrated the usefulness of the IrOx-based sensor as a diagnosis sensor for dry eye syndrome by comparing the results of the commercially available osmometer and our sensor using actual solution samples.

본 연구에서는 스크린 프린팅 공정을 통해 탄소 잉크 기반의 2상 전극을 제작하고, 전극 표면에 이리듐 산화물(IrOx)을 코팅함으로써 전극의 분극 현상을 제어할 수 있는 임피던스 센서를 개발하였다. IrOx는 순환 전압 전류법으로 탄소 전극의 표면 위에 순환 수(0~50 cycles)에 따라서 코팅되었다. 전자주사현미경을 이용하여 cycle 수가 증가할수록 IrOx 입자의 크기와 수가 증가하는 경향성을 확인하였다. 전기화학 임피던스 분석을 이용하여 상기 제조된 센서들의 NaCl 농도에 따른 임피던스 변화 값을 조사하였다. 50 cycle에서 제조된 센서가 가장 우수한 결정계수와 재현성을 나타내었으며, 이는 분극 현상이 잘 제어되었기 때문이다. 실제 용액 샘플들을 이용한 삼투압 장비와 비교 측정 실험을 수행함으로써 IrOx 기반 센서의 안구건조증 진단 센서로의 활용가치를 증명하였다.

Keywords

Acknowledgement

이 성과는 2020년도 정부(미래창조과학부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임. (NRF-2021R1A2C10099268)

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