Response kinetics of temperature independent resistive oxygen sensor formulations : a comparative study

Titelangaben

Sahner, Kathy ; Moos, Ralf ; Izu, Noriya ; Shin, Woosuck ; Murayama, Norimitsu:
Response kinetics of temperature independent resistive oxygen sensor formulations : a comparative study.
In: Sensors and Actuators B: Chemical. Bd. 113 (2006) Heft 1 . - S. 112-119.
ISSN 0925-4005
DOI: https://doi.org/10.1016/j.snb.2005.02.035

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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.