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A Cobalt-Nickel Metal-Alloy Thin-Film Sensor for Hydrogen-Phosphate Ion

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Abstract

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.

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Acknowledgments

The authors thank the Center for Instrumental Analysis, Kyushu Institute of Technology, for XRD, XPS, SEM and FT-IR measurements.

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Authors and Affiliations

  1. Department of Applied Chemistry, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata, Kitakyushu, Fukuoka, 804-8550, Japan

    Hideyasu Nakamura, Satoko Takase & Youichi Shimizu

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  1. Hideyasu Nakamura
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  2. Satoko Takase
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  3. Youichi Shimizu
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Nakamura, H., Takase, S. & Shimizu, Y. A Cobalt-Nickel Metal-Alloy Thin-Film Sensor for Hydrogen-Phosphate Ion. ANAL. SCI. 37, 337–340 (2021). https://doi.org/10.2116/analsci.20P290

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  • DOI: https://doi.org/10.2116/analsci.20P290

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