Development of SnO2-based ethanol gas sensor

✍ Scribed by Tomoki Maekawa; Jun Tamaki; Norio Miura; Noboru Yamazoe; Shigenori Matsushima

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 499 KB
• Volume: 9
• Category: Article
• ISSN: 0925-4005
• DOI: 10.1016/0925-4005(92)80195-4

✦ Synopsis

The sensitivity and selectivity of SnO2-based elements to ethanol vapour (1000 ppm) in air at 300 °C are found to be markedly promoted by the addition of several basic oxides, among which La203 is the most influential. The promoting effect seems to appear through a change of the reaction selectivity between the two oxidation routes for C2HsOH. Although these elements are rather slow in response rate, this can be improved significantly by loading the elements further with noble metal (Pd or Pt). The doubly promoted elements, Pd(0.5 wt.%)-La203(5 wt.%)-SnO 2 and Pt(0.5 wt.%)-La203-SnO2, show excellent sensing properties to ethanol vapour in the range 100-1000 ppm at 300 °C.