ZnO Film Flexible Printed Circuit Board pH Sensor Measurement and Characterization

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 d...

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Bibliographic Details
Published in:IEEE access 2022, Vol.10, p.96091-96099
Main Authors: Yang, Po-Hui, Chan, Che-Tsung, Zhang, Ying-Sheng
Format: Article
Language:English
Subjects:
Aminopropyltriethoxysilane
biosensor
Circuit boards
Electrical resistivity
Electrochemical analysis
Electrodes
flexible printed circuit board (FPCB)
Flexible printed circuits
II-VI semiconductor materials
pH sensor
Printed circuits
Sensors
Stability
Stability analysis
Substrates
Voltage measurement
Zinc oxide
zinc oxide (ZnO)
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Summary: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.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2022.3205320