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http://dx.doi.org/10.5369/JSST.2002.11.2.077

Fabrication and characteristics of alcohol sensor using Fe2O3  

Lee, Y.S. (School of Electronic & Electrical Eng., Kyungpook National Univ.)
Song, K.D. (School of Electronic & Electrical Eng., Kyungpook National Univ.)
Lee, S.M. (School of Electronic & Electrical Eng., Kyungpook National Univ.)
Shim, C.H. (School of Electronic & Electrical Eng., Kyungpook National Univ.)
Choi, N.J. (School of Electronic & Electrical Eng., Kyungpook National Univ.)
Joo, B.S. (School of Electronic & Electrical Eng., Kyungpook National Univ.)
Lee, D.D. (School of Electronic & Electrical Eng., Kyungpook National Univ.)
Huh, J.S. (Dept. Materials Science and Metallurgy, Kyungpook National Univ.)
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Abstract
In order to get low cost and portability, semiconductor gas sensor need to have low operating temperature and high sensitivity. $Fe_2O_3$ based sensors which were doped with metal oxide catalysts($MoO_3$, $V_2O_5$, $TiO_2$, and CdO) were fabricated by screen printing method. To improve electrical stability of sensors, the $Fe_2O_3$ sensors were annealed in $N_2$ at $700^{\circ}C$ for 2 hours. The $V_2O_5$ doped $Fe_2O_3$ sensor showed about $80{\sim}90%$ sensitivity at alcohol 1,000 ppm and have good selectivity to hydrocarbon gas and tobacco odors. The fabricated sensor and PIC-chip were employed for portable alarm system.
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