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http://dx.doi.org/10.5369/JSST.2002.11.1.018

Ammonia gas sensing characteristics of LaFeO3 thick-films With Al2O3 additives  

Kim, Jun-Gon (Dept. of Electrical and Electronics Enginering, Gyeongsang National University)
Ahn, Byeong-Yeol (Dept. of Electrical and Electronics Enginering, Gyeongsang National University)
Ma, Tae-Young (Dept. of Electrical and Electronics Enginering, Gyeongsang National University)
Park, Ki-Cheol (Dept. of Electrical and Electronics Enginering, Gyeongsang National University)
Kim, Jeong-Gyoo (Dept. of Electrical and Electronics Enginering, Gyeongsang National University)
Publication Information
Journal of Sensor Science and Technology / v.11, no.1, 2002 , pp. 18-27 More about this Journal
Abstract
$LaFeO_3$-based thick films with 2wt.%, 5wt.% and 10wt.% $Al_2O_3$ additives were fabricated by screen printing method on $Al_2O_3$ substrates. Structural, electrical and ammonia gas sensing characteristics of the thick films with different heat treatment temperatures were examined. From XRD results, the compound of $LaFeO_3$ and $Al_2O_3$ was not found until the heat treatment at $1200^{\circ}C$. SEM microphotograph showed similar grain growth despite the amount of $Al_2O_3$ additives with the heat treatment. Thick films with high activation energy and low resistance in the electrical properties showed high sensitivity for gases. Thick films with 2wt % $Al_2O_3$ additives heat-treated at $1200^{\circ}C$ showed the sensitivities of 210% for 100 ppm $NH_3$ gas at the working temperature of $350^{\circ}C$. The thick films showed food selectivity to $NH_3$ gas.
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