Electrochemical Nitrate-Ion Sensor Based on CuCo₂O₄ Spinel-Type Oxide Thick-Film

抄録

Detection of nitrate-ion has been becoming important for various industrial fields and natural water systems. In this study, electrochemical nitrate-ion sensors based on Cu-based spinel-type oxide thick-films have been investigated. Spinel-type oxide fine powders prepared by a polymer precursor method at 550°C were used for screen printing to prepare thick-film devices. Among the spinel-type oxides tested, the CuCo₂O₄-based device showed relatively good amperometric response to nitrate-ion between 1.0×10^-4 and 1.0×10^-2 M at pH = 5 among the tested NO₃^-. Cl^-, and H₂PO₄^-. The 90% response time of the sensor device was as short as about 30 s at room temperature.