Cited by 136Analytical Chemistry and SensorsElectrochemical Analysis and ApplicationsElectrochemical sensors and biosensors

Improved Electrodeposited Iridium Oxide pH Sensor Fabricated on Etched Titanium Substrates

Marzouk, Sayed A. M.·2003·Analytical Chemistry

Abstract

In the present paper, the preparation and characterization of an improved solid-state pH sensor are described. The sensor is based on anodically electrodeposited iridium oxide film, as a pH-sensing layer. Merits of the present sensor include (i) excellent adhesion of the pH sensitive layer to the substrate, (ii) excellent reproducibility of sensor fabrication, (iii) faster preparation procedure, and (iv) low cost of the titanium substrate. These advantages are realized by combining acid-etched titanium as the electrode substrate with an optimized electrodeposition solution consisting of IrCl4 as an iridium source, hydrogen peroxide, potassium oxalate, and potassium carbonate. Heating the electrodeposition solution to 90 degrees C reduced the time required for solution development from approximately 3 days to 10 min. The pH-sensing layer is protected with a layer of Nafion and a microporous polyester membrane. The improved sensor showed a super-Nernstian response (-73.7 +/- 1.2 mV/pH unit) in the pH range of 1.5-11.5. The present pH sensor, fabricated in a tubular form, is used as a detector in a flow injection analysis (FIA) system for pH measurements. Optimization of the FIA experimental parameters resulted in a linear dependence of peak heights on the pH of the injected samples in the pH range of 2-11.

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Crossref · 10.1021/ac0261404

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17 of 17 references verified0 citation errors · 0 not checkable

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  • Electrodeposited iridium oxide adheres poorly with its underlying substrate, resulting in a tendency to delaminate while under operation, which shortens the electrode lifespan.

    “Electrodeposited iridium oxide has been reported to adhere poorly with its underlying substrate, resulting in a tendency, to delaminate while under operation, which shortens the electrode lifespan [14] [15].”

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Authors
Marzouk, S. A. M.
Affiliations
United Arab Emirates University (AE)
Corresponding author
Marzouk, Sayed A. M.
Venue
Analytical Chemistry
Published
2003-02-19
Volume
75
Issue
6
Pages
1258-1266
ISSN
  • 0003-2700 (ISSN-L)
  • 1520-6882
OpenAlex
W2059791733
Cited by
136
References
17
Citations by year
2026: 3 · 2025: 3 · 2024: 4 · 2023: 8 · 2022: 7 · 2021: 6 · 2020: 6 · 2019: 7 · 2018: 8 · 2017: 3 · 2016: 5 · 2015: 6 · 2014: 10 · 2013: 6 · 2012: 8
FWCI
2.80
Type
journal article
Language
en
Open access
closed
Locations
  • Analytical Chemistry (publishedVersion)
  • PubMed (publishedVersion)
Funders
United Arab Emirates University
Topics
  • Physical Sciences › Chemical Engineering › Bioengineering › Analytical Chemistry and Sensors
  • Physical Sciences › Chemistry › Electrochemistry › Electrochemical Analysis and Applications
  • Physical Sciences › Engineering › Electrical and Electronic Engineering › Electrochemical sensors and biosensors
Keywords
iridium oxide, solid-state pH sensor, anodic deposition, super-Nernstian response, flow injection analysis, pH detection

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