ZnO and AZO Film Potentiometric pH Sensors Based on Flexible Printed Circuit Board

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

doi:10.3390/chemosensors10080293

Chemosensors (Jul 2022)

ZnO and AZO Film Potentiometric pH Sensors Based on Flexible Printed Circuit Board

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

Affiliations

Po-Hui Yang: Graduate School of Electronic Engineering, National Yunlin University of Science and Technology, Douliou 64002, Taiwan
Ying-Sheng Chang: Graduate School of Electronic Engineering, National Yunlin University of Science and Technology, Douliou 64002, Taiwan
Che-Tsung Chan: Graduate School of Electronic Engineering, National Yunlin University of Science and Technology, Douliou 64002, Taiwan

DOI: https://doi.org/10.3390/chemosensors10080293
Journal volume & issue: Vol. 10, no. 8
p. 293

Abstract

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In this study, we deposited zinc oxide (ZnO) and aluminum-doped zinc oxide (AZO) on the electroless nickel immersion gold (ENIG) of a flexible printed circuit board (FPCB) as a potentiometric pH sensor. The sensing films of the pH sensor were fabricated by a radio frequency (RF) sputtering system and analyzed by field emission scanning electron microscope (FE-SEM) and X-ray photoelectron spectroscopy (XPS). In the pH 2 to 10 buffer solutions, it was observed that the characteristics of the pH sensor through the voltage–time (V-T) measurement system include average sensitivity and linearity, drift effect, and repeatability. According to the experimental results, the pH sensors in this study could exhibit good characteristics.

Published in Chemosensors

ISSN: 2227-9040 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry: Organic chemistry: Biochemistry
Website: http://www.mdpi.com/journal/chemosensors

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