Response kinetics of temperature-independent resistive oxygen sensor formulations: a comparative study |
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| Affiliation: | 1. Ionics Lab, School of Materials Science and Engineering, Chonnam National University, 77, Yongbong-ro, Buk-gu, Gwang-Ju 61186, Republic of Korea;2. Department of Ceramic Engineering, Indian Institute of Technology, Banaras Hindu University, Varanasi 221005, India;1. TOSA Innovative Human Development Programs, Kochi University, 2-5-1 Akebono-cho, Kochi-shi, Kochi 780-8520, Japan;2. Department of Mathematics and Physics, Faculty of Science and Technology, Kochi University, 2-5-1 Akebono-cho, Kochi-shi, Kochi 780-8520, Japan;1. Graduate School Environmental Studies, Tohoku University, 6-6-01 Aramaki-Aoba, Aoba-ku, Sendai 980-8579, Japan;2. Institute of Multidisciplinary Research for Advanced Material, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan;3. National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, AIST Tsukuba Central 5, Tsukuba, Ibaraki 305-8565, Japan |
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| Abstract: | This contribution compares the response kinetics of two temperature-independent resistive oxygen sensor formulations: LaCu0.3Fe0.7O3−δ (LCF) and La0.05Sr0.95Ti0.65Fe0.35O3−δ (LSTF). Screen-printed thick film sensor specimens were prepared. Sensor characteristics towards oxygen were determined, and additional measurements in the frequency domain were realized: the former indicate a fast and nearly temperature-independent response of LCF and LSTF compositions in the temperature range between 750 and 900 °C. The latter allow conclusions on the underlying sensing mechanism. Whereas oxygen sensitivity of LSTF is exclusively controlled by a reaction step, response of LCF is governed by reaction only at lower temperatures. At higher temperatures, a diffusion process becomes limiting. This different behavior is attributed to different microstructures of the sensitive films. |
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