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Micromachines
Volume 13
Issue 12
10.3390/mi13122143
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Review

Micro-Sized pH Sensors Based on Scanning Electrochemical Probe Microscopy

by
Muhanad Al-Jeda
†,
Emmanuel Mena-Morcillo
† and
Aicheng Chen
*
Electrochemical Technology Center, Department of Chemistry, University of Guelph, 50 Stone Road East, Guelph, ON N1G 2W1, Canada
*
Author to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Micromachines 2022, 13(12), 2143; https://doi.org/10.3390/mi13122143
Submission received: 4 November 2022 / Revised: 29 November 2022 / Accepted: 1 December 2022 / Published: 4 December 2022
(This article belongs to the Special Issue MEMS Sensors: Fabrication and Application)
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Abstract

Monitoring pH changes at the micro/nano scale is essential to gain a fundamental understanding of surface processes. Detection of local pH changes at the electrode/electrolyte interface can be achieved through the use of micro-/nano-sized pH sensors. When combined with scanning electrochemical microscopy (SECM), these sensors can provide measurements with high spatial resolution. This article reviews the state-of-the-art design and fabrication of micro-/nano-sized pH sensors, as well as their applications based on SECM. Considerations for selecting sensing probes for use in biological studies, corrosion science, in energy applications, and for environmental research are examined. Different types of pH sensitive probes are summarized and compared. Finally, future trends and emerging applications of micro-/nano-sized pH sensors are discussed.
Keywords: localized pH; microelectrode probe; microsensor; nanosensor; potentiometric sensor; voltammetric sensor; scanning electrochemical microscopy localized pH; microelectrode probe; microsensor; nanosensor; potentiometric sensor; voltammetric sensor; scanning electrochemical microscopy

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MDPI and ACS Style

Al-Jeda, M.; Mena-Morcillo, E.; Chen, A. Micro-Sized pH Sensors Based on Scanning Electrochemical Probe Microscopy. Micromachines 2022, 13, 2143. https://doi.org/10.3390/mi13122143

AMA Style

Al-Jeda M, Mena-Morcillo E, Chen A. Micro-Sized pH Sensors Based on Scanning Electrochemical Probe Microscopy. Micromachines. 2022; 13(12):2143. https://doi.org/10.3390/mi13122143

Chicago/Turabian Style

Al-Jeda, Muhanad, Emmanuel Mena-Morcillo, and Aicheng Chen. 2022. "Micro-Sized pH Sensors Based on Scanning Electrochemical Probe Microscopy" Micromachines 13, no. 12: 2143. https://doi.org/10.3390/mi13122143

APA Style

Al-Jeda, M., Mena-Morcillo, E., & Chen, A. (2022). Micro-Sized pH Sensors Based on Scanning Electrochemical Probe Microscopy. Micromachines, 13(12), 2143. https://doi.org/10.3390/mi13122143

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