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Metal oxides based electrochemical pH sensors: Current progress and future perspectives

Manjakkal, Libu; Szwagierczak, Dorota; Dahiya, Ravinder


Dorota Szwagierczak

Ravinder Dahiya


Electrochemical pH sensors are on high demand in numerous applications such as food processing, health monitoring, agriculture and nuclear sectors, and water quality monitoring etc., owing to their fast response (<10 s), wide pH sensing range (2–12), superior sensitivity (close to Nernstian response of 59.12 mV/pH), easy integration on wearable/flexible substrates, excellent biocompatibility and low cost of fabrication. This article presents an in-depth review of the wide range of MOx materials that have been utilized to develop pH sensors, based on various mechanisms (e.g. potentiometric, conductimetric, chemi-resistors, ion sensitive field effect transistor (ISFET) and extended-gate field effect transistor etc.). The tools and techniques such as potentiometric and electrochemical impedance spectroscopic that are commonly adopted to characterize these metal oxide-based pH sensors are also discussed in detail. Concerning materials and design of sensors for various practical application, the major challenges are toxicity of materials, interfernce of other ions or analytes, cost, and flexibility of materials. In this regard, this review also discusses the metal oxide-based composite sensing (active) material, designs of pH sensors and their applications in flexible/wearable biosensors for medical application are examined to present their suitability for these futuristic applications.

Journal Article Type Article
Acceptance Date Dec 10, 2019
Online Publication Date Dec 16, 2019
Publication Date 2020-04
Deposit Date Jul 19, 2022
Publicly Available Date Jul 20, 2022
Journal Progress in Materials Science
Print ISSN 0079-6425
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 109
Article Number 100635
Keywords Electrochemical pH sensor, Metal oxide, Potentiometric sensor, ISFET, Flexible sensors
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