期刊
PROGRESS IN MATERIALS SCIENCE
卷 109, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pmatsci.2019.100635
关键词
Electrochemical pH sensor; Metal oxide; Potentiometric sensor; ISFET; Flexible sensors
资金
- Engineering and Physical Sciences Research Council (EPSRC) through Engineering Fellowship for Growth - PRINTSKIN [EP/M002527/1]
- Engineering and Physical Sciences Research Council (EPSRC) through Engineering Fellowship for Growth - neuPRINTSKIN [EP/R029644/1]
- European Commission through AQUASENSE [H2020-MSCA-ITN-2018-813680]
- North West Centre for Advanced Manufacturing (NW CAM) project - European Union's INTERREG VA Programme [H2020-Intereg-IVA5055]
- EPSRC [EP/M002527/1, EP/R029644/1] Funding Source: UKRI
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.
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