Sensitivity enhancement for H2 gas detection using a SnO2–Ag2O–PdOx nanocrystalline system

✍ Scribed by Kee Bae Park; Sang-Do Han; Il Jin Kim; Jin Suk Wang; Young Sung Park

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 295 KB
• Volume: 130
• Category: Article
• ISSN: 0921-5107
• DOI: 10.1016/j.mseb.2006.03.001

✦ Synopsis

Thick film H 2 sensors were fabricated using SnO 2 loaded with Ag 2 O and PdO x . The composition that gave highest sensitivity for H 2 was in the wt.% ratio of SnO 2 :Ag 2 O:PdO x as 93:5:2. The nano-crystalline powders of SnO 2 -Ag 2 O-PdO x composites synthesized by sol-gel method were screen printed on alumina substrates. Fabricated sensors were tested against gases like H 2 , CH 4 , C 3 H 8 , C 2 H 5 OH and SO 2 . The composite material was found sensitive against H 2 at the working temperature 125 • C, with minor interference of other gases. H 2 gas as low as 100 ppm can be detected by the present fabricated sensors. It was found that the sensors based on SnO 2 -Ag 2 O-PdO x nanocrystalline system exhibited high performance, high selectivity and very short response time to H 2 at ppm level. These characteristics make the sensor to be a promising candidate for detecting low concentrations of H 2 .