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Fabrication and Sensing Behavior of NASICON Thick Film SO2 Gas Sensor by Screen-Printing Method

The thick type sensor having Pt/Na super ionic conductor(NASICON) Pt/Na 2 SO 4 /Pt catalyst system for SO 2 gas sensing was fabricated by screen printing method. The phases of NASICON with the variation of sintering temperature (1050°C, 1150°C, 1250 °C ) and sintering time (1.5hr, 2.5hr, 3.5hr) were investigated by XRD. The variation of electromotive force of the sensor with SO 2 concentration and operation temperature were also investigated. The major phase of NASICON film sintered at 1150°C for 3.5hr was sodium zirconium silicon phosphate (Na 3 Zr 2 Si 2 PO 12 ). The Nernest's slope of NASICON sensor for SO 2 gas with the variation of concentration from 10 to 100 ppm was 176.12 mV/decade at the operating temperature of 500°C. The increase of oxygen partial pressure was not affected to the variation of Nernst's slope.