Effect of additives on Al₂O₃ based LPG sensors

Abstract

<smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="State"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"> Sensitivity and selectivity of Al₂O₃ thick films for LPG gas sensor have been examined. The structural properties of Al₂O₃have been examined by means of XRD and the surface morphology by the SEM studies. XRD confirmed the complete phase formation at 800^oC for 6 h. The sensing properties and response time of (1 wt%) Pd:(10 wt%) Cr₂O₃ doped Al₂O₃ have been characterized by d.c. electrical measurements for different gases. The element is exposed to several gases such as LPG, CO, CH₄ in dry air. It shows good sensitivity and selectivity towards LPG at low operating temperature. </smarttagtype></smarttagtype>