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Micro-Sized pH Sensors Based on Scanning Electrochemical Probe Microscopy

Journal

MICROMACHINES
Volume 13, Issue 12, Pages -

Publisher

MDPI
DOI: 10.3390/mi13122143

Keywords

localized pH; microelectrode probe; microsensor; nanosensor; potentiometric sensor; voltammetric sensor; scanning electrochemical microscopy

Funding

  1. the Natural Sciences and Engineering Research Council of Canada
  2. [RGPIN-2022-04238]

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This article reviews the design and fabrication technologies of micro-/nano-sized pH sensors, as well as their applications based on SECM. Considerations for selecting sensing probes and different types of pH sensitive probes are discussed. The future trends and emerging applications of micro-/nano-sized pH sensors are also addressed.
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.

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