A Cobalt-Nickel Metal-Alloy Thin-Film Sensor for Hydrogen-Phosphate Ion
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- NAKAMURA Hideyasu
- Department of Applied Chemistry, Kyushu Institute of Technology
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- TAKASE Satoko
- Department of Applied Chemistry, Kyushu Institute of Technology
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- SHIMIZU Youichi
- Department of Applied Chemistry, Kyushu Institute of Technology
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Abstract
<p>Cobalt-nickel alloy thin-films were prepared by electrodepositing on Au-coated Al2O3 substrate from aqueous solutions of metal-salts, and applied as a potentiometric hydrogen-phosphate ion sensor. A doping of 20 mol% nickel in cobalt contributed to enhancing hydrogen-phosphate ion sensing performances, i.e., the sensing range and response time were drastically improved. The Co80Ni20 thin-film electrode showed good potentiometric response to hydrogen-phosphate ion between 1.0 × 10−5 and 1.0 × 10−3 M with a slope of –59 mV/decade and high anion selectivity. The 90% response time to 1 mM H2PO4− was as short as 15 s at pH 5.0, 30°C. A mixed potential sensing mechanism could be proposed on the basis of the results.</p>
Journal
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- Analytical Sciences
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Analytical Sciences 37 (2), 337-340, 2021-02-10
The Japan Society for Analytical Chemistry
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Details
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- CRID
- 1390005667264656000
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- NII Article ID
- 130007983502
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- NII Book ID
- AA10500785
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- ISSN
- 13482246
- 09106340
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- NDL BIB ID
- 031282011
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- PubMed
- 32921653
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- PubMed
- CiNii Articles
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- Abstract License Flag
- Disallowed