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Semiconductor type micro gas sensor for $H_2$ detection using a $SnO_2-Ag_2O-PtO_x$ system by screen printing technique  

Kim, Il-Jin (Grad School of Chungnam National Univ.)
Han, Sang-Do (Korea Institute of Energy Research(KIER))
Lee, Hi-Deok (Grad School of Chungnam National Univ.)
Wang, Jin-Suk (Grad School of Chungnam National Univ.)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.17, no.1, 2006 , pp. 69-74 More about this Journal
Abstract
Thick film $H_2$ sensors were fabricated using $SnO_2$ loaded with $Ag_2O$ and $PtO_x$. The composition that gave the highest sensitivity for $H_2$ was in the weight% ratio of $SnO_2 : PtO_x : Ag_2O$ as 93 : 1 : 6. The nano-crystalline powders of $SnO_2$ synthesized by sol-gel method were screen printed with $Ag_2O$ and $PtO_x$ on alumina substrates. The fabricated sensors were tested against gases like $H_2$, $CH_4$, $C_3H_8$, $C_2H_5OH$ and $SO_2$. The composite material was found sensitive against $H_2$ at the working temperature $130^{\circ}C$, with minor interference of other gases. The $H_2$ gas as low as 100 ppm can be detected by the present fabricated sensors. It was found that the sensors based on $SnO_2-Ag_2O-PtO_x$ system exhibited the 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 $H_2$.
Keywords
$SnO_2-Ag_2O-PtO_x$ composites; Sol-gel method$H_2$ gas sensor;
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