期刊
IEEE SENSORS JOURNAL
卷 22, 期 12, 页码 11474-11479出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2022.3172717
关键词
Electrodes; Sensors; Gold; Polymers; Hydrogen; Coatings; Biomembranes; Ion-selective electrodes; pH sensor; ionophore; polyaniline
资金
- A*STAR/Singapore Accelerate Technologies [ACCL/19-GAP090-R20A-D]
This paper evaluates pH sensing electrodes based on hydrogen ionophores or pH-sensitive emeraldine-polyaniline. The performance was assessed by measuring sensitivity, dynamic range, conductance, and capacitance. The longevity and stability of the emeraldine-polyaniline-based pH sensor were also evaluated.
pH sensors are widely used in various applications such as agriculture, wastewater monitoring, and biomedical engineering. Solid-state ion-selective electrodes (ISEs) have been developed to enable the miniaturization of pH sensors. This paper evaluated the pH sensing electrodes based on hydrogen ionophores or pH-sensitive emeraldine-polyaniline. A miniaturized leak-free reference electrode was integrated with pH sensing electrodes. A multiple-channel electromotive force recording unit was built to facilitate the measurement of multiple ISEs. The sensitivity and dynamic range were assessed using the pH solutions from pH 1.3 to pH 10. The conductance and capacitance of different ISEs were measured and compared. We evaluated the longevity and stability of the emeraldine-polyaniline-based pH sensor, and the drifting was less than 4 mV/day.
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