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

윤은섭; 윤조희; 손선규; 김서진; 최봉길; Eun Seop Yoon; Jo Hee Yoon; Seon Gyu Son; Seo Jin Kim; Bong Gill Choi

Applied Chemistry for Engineering, Vol.32, No.6, 700-705, December, 2021

DOI10.14478/ace.2021.1092 Export Citation

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

Development of a Portable and Disposable pH Sensor Based on Titanium Wire with High Electrochemical Sensing Performance

윤은섭, 윤조희, 손선규, 김서진, 최봉길^†

강원대학교(삼척캠퍼스) 화학공학과

Eun Seop Yoon, Jo Hee Yoon, Seon Gyu Son, Seo Jin Kim, and Bong Gill Choi^†

Department of Chemical Engineering, Kangwon National University, Samcheok 25913, Republic of Korea

E-mail:

초록

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 안정성측면에서 우수한 전기화학적 감지 성능을 보여 주었다. 현장 검사 응용을 시연하기 위해서 pH 센서를 모바일 애플리 케이션과 통신할 수 있는 무선 전자 모듈과 통합하였다. 이 휴대용 pH 센서는 실제 샘플의 pH 변화를 정확하게 측정 했으며 결과는 상용 pH 측정기의 데이터와 일치하였다.

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.

Keywords:pH sensor;Electrochemistry;Titanium;Electromotive force;Iridium oxide

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[5] Varela AS, Curr. Opin. Green Sustainable Chem., 26, 100371 (2020)

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[7] Song Y, Min J, Yu Y, Wang H, Yang Y, Zhang H, Gao W, Sci. Adv., 6, eaay98 (2020)

[8] Bandodkar AJ, Gutruf P, Choi J, et al., Sci. Adv., 5, eaav32 (2019)

[9] Yoon JH, Kim SM, Park HJ, Kim YK, Oh DX, Cho HW, Lee KG, Hwang SY, Park J, Choi BG, ACS Appl. Mater. Interfaces, 11, 46165 (2019)

[10] Ghoneim MT, Nguyen A, Dereje N, Huang J, Moore GC, Murzynowski PJ, Dagdeviren C, Chem. Rev., 119, 5248 (2019).

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[12] Tanumihardja E, Olthuis W , van den BergSensors A, 18, No. 2901 (2018).

[13] Telli L, Brahimi B, Hammouche A, Solid State Ion., 128, 255 (2000).

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[16] Kreider KG, Tarlov MJ, Cline JP, Sens. Actuators B Chem., 28, 167 (1995).

[17] Yoon JH, Hong SB, Yun SO, Lee SJ, Lee TJ, Lee KG, Choi BG, J. Colloid Interface Sci., 490, 53 (2017)

[18] Lakard B, Segut O, Lakard S, Herlem G, Gharbi T, Sens. Actuators B Chem., 122, 101 (2007)

[19] Huang WD, Cao H, Deb S, Chiao M, Chiao JC, Sens. Actuators A-Phys., 169, 1 (2011)

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[21] Chung HJ, Sulkin MS, Kim JS, et al., Adv. Healthc. Mater, 3, 59 (2014)

[22] Anastasova S, Kassanos P, Yang GZ, Biosens. Bioelectron., 102, 668 (2018)

[23] Negi S, Bhandari R, Rieth L, Solzabacher F, Sens. Actuators B-Chem., 137, 370 (2009)

[24] Choi WH, Papautsky I, Meas. Sci. Technol., 22, 042001 (2011)

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[28] Park HJ, Jeong JM, Son SG, et al., Adv. Funct. Mater., 31, 201059 (2021)

[29] Kim DS, Jeong JM, Park HJ, Kimi YK, Lee KG, Choi BG, Nano-Micro Lett., 13, 87 (2021)

[30] Pingarron JM, Labuda J, Barek J, Brett CMA, Camoes MF, Fojta M, Hibbert DB, Pure Appl. Chem., 92, 641 (2020)