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- W2059791733 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." @default.
- W2059791733 created "2016-06-24" @default.
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- W2059791733 date "2003-02-19" @default.
- W2059791733 modified "2023-09-26" @default.
- W2059791733 title "Improved Electrodeposited Iridium Oxide pH Sensor Fabricated on Etched Titanium Substrates" @default.
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- W2059791733 doi "https://doi.org/10.1021/ac0261404" @default.
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