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http://dx.doi.org/10.4313/JKEM.2008.21.9.812

Characteristics of Catalytic Combustible Gas Sensor Based on Planar Technology  

Kim, Yeong-Bok (조선대학교 신소재공학과)
Noh, Hyo-Sub (조선대학교 신소재공학과)
Park, Jin-Seong (조선대학교 신소재공학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.21, no.9, 2008 , pp. 812-817 More about this Journal
Abstract
A catalytic combustible sensor for LPG/LNG detection was fabricated on $Al_2O_3$ substrate using planar technology. The catalysts of Pd and Pt were added to ${\alpha}$- and ${\gamma}-Al_2O_3$ powders. The mixture of Pt, Pd and $Al_2O_3$ were homogenized by using a three roll mixer. TCR characteristics of Pt heater were optimized with the heat treatment temperature. Sensing properties were investigated as a function of the microstructure of $Al_2O_3$, the gas concentration and the variation of input voltage. ${\alpha}-Al_2O_3$ sintered at 500 $^{\circ}C$ is more suitable as LPG/LNG sensor due to good grain shape and size distribution of about 300 nm than that of ${\gamma}-Al_2O_3$ which is in irregular shape and with a particle size of 5-30 ${\mu}m$. The sensor has shown maximum output voltage of 14 mV for 1000 ppm $C_4H_{10}$ and 3.8 mV for 1000 ppm $CH_4$ at 5.0 V input voltage.
Keywords
Catalytic combustible gas sensor; Planar type; LPG/LNG sensor; Thick film;
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