ZnO Film Flexible Printed Circuit Board pH Sensor Measurement and Characterization

Po-Hui Yang; Che-Tsung Chan; Ying-Sheng Zhang

doi:10.1109/ACCESS.2022.3205320

IEEE Access (Jan 2022)

ZnO Film Flexible Printed Circuit Board pH Sensor Measurement and Characterization

Po-Hui Yang,
Che-Tsung Chan,
Ying-Sheng Zhang

Affiliations

Po-Hui Yang: ORCiD; Graduate School of Electronic Engineering, National Yunlin University of Science and Technology, Douliou, Taiwan
Che-Tsung Chan: Graduate School of Electronic Engineering, National Yunlin University of Science and Technology, Douliou, Taiwan
Ying-Sheng Zhang: Graduate School of Electronic Engineering, National Yunlin University of Science and Technology, Douliou, Taiwan

DOI: https://doi.org/10.1109/ACCESS.2022.3205320
Journal volume & issue: Vol. 10
pp. 96091 – 96099

Abstract

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An electrochemical zinc oxide (ZnO) pH sensor is proposed and prototyped using a flexible printed circuit board (FPCB). The device is resistant to acidic and alkaline solutions and exhibits excellent electrical conductivity. The sensing film was deposited by radio-frequency sputtering, providing a dense ZnO layer, and (3-aminopropyl)triethoxysilane (APTES) was used to enhance the chemical stability of the ZnO in acidic solutions. The proposed pH sensor has an average sensitivity of 37.52 mV/pH, linearity of 0.995, and a repeatable RSD value of 2.4%. Testing was conducted with Carmody’s buffer pH 2–10 and a voltage-time measurement system. The stability of the prototype was determined by the measurement of the drift and hysteresis effects.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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