Application of a Modified Ultrasonic Aerosol Device to the Synthesis of SnO2and Pt/SnO2for Gas Sensors

✍ Scribed by M.V. Cabañas; G. Delabouglise; M. Labeau; M. Vallet-Regı́

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 369 KB
• Volume: 144
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.8122

✦ Synopsis

SnO 2 and Pt/SnO 2 powders were synthesized with a modified ultrasonic aerosol pyrolysis device. The advantages of this new method were tested by comparison of pure SnO 2 powders synthesized by conventional and modified aerosol methods. Then, the synthesis of SnO 2 with Pt was carried out by this new method. The droplet evaporation and pyrolysis processes induce the formation of materials with a fine microstructure that exhibit, after annealing, a high sensitivity to ethanol or CO in air. In the Pt/SnO 2 powders, platinum aggregates dispersed onto the SnO grains improve the sensitivity of SnO 2 powders when the sample is annealed at 700°°C. Therefore, a Pt/SnO 2 sample submitted to such thermal treatment is a good candidate for CO and C 2 H 5 OH detection due to its sensitivity to both gases.