Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Development of a Portable and Disposable pH Sensor Based on Titanium Wire with High Electrochemical Sensing Performance

우수한 전기화학적 센싱 성능을 지닌 티타늄 와이어 기반의 휴대 및 일회용 pH 센서 개발

  • Yoon, Eun Seop (Department of Chemical Engineering, Kangwon National University) ;
  • Yoon, Jo Hee (Department of Chemical Engineering, Kangwon National University) ;
  • Son, Seon Gyu (Department of Chemical Engineering, Kangwon National University) ;
  • Kim, Seo Jin (Department of Chemical Engineering, Kangwon National University) ;
  • Choi, Bong Gill (Department of Chemical Engineering, Kangwon National University)
  • 윤은섭 (강원대학교(삼척캠퍼스) 화학공학과) ;
  • 윤조희 (강원대학교(삼척캠퍼스) 화학공학과) ;
  • 손선규 (강원대학교(삼척캠퍼스) 화학공학과) ;
  • 김서진 (강원대학교(삼척캠퍼스) 화학공학과) ;
  • 최봉길 (강원대학교(삼척캠퍼스) 화학공학과)
  • Received : 2021.10.29
  • Accepted : 2021.11.22
  • Published : 2021.12.10
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Abstract

A portable and disposable pH sensor based on Ti wire was successfully developed for monitoring hydronium ion concentrations. A sensing electrode was prepared by electrochemically depositing iridium oxide onto a Ti wire, while a reference electrode was fabricated by coating Ag/AgCl ink on a Ti wire. Combining the two electrodes in the pH sensor enabled the collection of open circuit potential signals when the sensor was immersed in solutions of various pH values. The pH sensor exhibited excellent electrochemical sensing performance in terms of sensitivity, response time, repeatability, selectivity, and stability. To demonstrate point-of-measurement applications, the pH sensor was integrated with a wireless electronic module that could communicate with a mobile application. The portable pH sensor accurately measured pH changes in real samples. The results obtained were consistent with those of using a commercial pH meter.

본 연구에서는 하이드로늄 이온 농도를 모니터링하기 위한 티타늄(Ti) 와이어를 기반으로 하는 휴대용 일회용 pH 센서를 성공적으로 개발하였다. 센싱 전극은 Ti 와이어에 이리듐 산화물을 전기화학적으로 증착하여 제조하였고, 기준 전극으로 Ti 와이어에 Ag/AgCl 잉크를 코팅하였다. pH 센서에 두 개의 전극을 결합한 후 pH 센서를 다양한 pH 용액에 담그면 개방 회로 전위 신호를 수집할 수 있다. 상기 제조된 pH 센서는 감도, 응답 시간, 반복성, 선택도 및 안정성 측면에서 우수한 전기화학적 감지 성능을 보여 주었다. 현장 검사 응용을 시연하기 위해서 pH 센서를 모바일 애플리케이션과 통신할 수 있는 무선 전자 모듈과 통합하였다. 이 휴대용 pH 센서는 실제 샘플의 pH 변화를 정확하게 측정했으며 결과는 상용 pH 측정기의 데이터와 일치하였다.

Keywords

Acknowledgement

This research was supported by University innovation support project through the National Research Foundation of Korea funded by the Ministry of Education. This work was supported by the National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT (No. 2021R1A2C1009926).

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