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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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