A SrF2-based oxygen sensor operative at low temperature1Paper presented at the 2nd Asia Conference on Chemical Sensors, Xi'an, P.R. China, 1995.1

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.