V2O5-P2O5 Glass Ceramic as a Resistive Solid-State CO2 Gas Sensor

Abstract

Now a day the specific demand for gas detection and monitoring has emerged particularly as the awareness of the need to protect the environment has grown. The solid-state gas sensors, based on a variety of principles and materials, are the best candidates to the development of commercial gas sensors for a wide range of applications. The resistive type solid-state gas sensor of V₂O₅-P₂O₅ (1:1 M) glass ceramic was fabricated by melt quenching method on silica substrate. The sensor was investigated for CO₂ gas environment at lower ppm level (up to 70 ppm) at room temperature. The response (sensitivity) of sensor at 70 ppm of CO₂ was found to be 0.3. The sensing parameters such as resolution limit, resistance change/ppm and response time were observed to be 5.5 ppm, 195 × 10⁶ W/ppm and ca. 2 min respectively. The sensor material was characterized by XRD and SEM analysis.