Abstract
Abstract Potentiometric disk type oxygen sensors monitoring in low temperatures (200–500°C) were fabricated using SrF 2 and their sensing characteristics were investigated. The disk type oxygen sensors consist of a reference electrode: Air (O 2 )|Pt, a solid electrolyte SrF 2 and a sensing Pt electrode. The correlation between the electromotive force(EMF) and oxygen partial pressure at various temperatures between 200 and 500°C was obtained. The experimental results were found to follow the Nernst equation in the test range of 0.1–100% oxygen partial pressure. The sensor element of the disk type showed an EMF change of 60 mV for an oxygen concentration change of 1–10% at a device temperature of 300°C. The sensor with Ni/NiO reference electrode showed an EMF change of 55 mV change for an oxygen concentration change of 0.1–10% at the same temperature.
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