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Non‐Nernstian Planar Sensors Based on YSZ with Ta (10 at.%)‐Doped Nanosized Titania as a Sensing Electrode for High‐Temperature Applications
Author(s) -
Chevallier Laure,
Grilli Maria Luisi,
Di Bartolomeo Elisabetta,
Traversa Enrico
Publication year - 2006
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2006.02095.x
Subject(s) - electromotive force , materials science , electrode , yttria stabilized zirconia , doping , planar , operating temperature , atmospheric temperature range , oxygen sensor , optoelectronics , chemical engineering , analytical chemistry (journal) , composite material , oxygen , cubic zirconia , ceramic , electrical engineering , chemistry , chromatography , computer graphics (images) , physics , organic chemistry , meteorology , computer science , engineering
Planar sensors based on tape‐cast YSZ layers with two parallel Pt (or Au) finger electrodes, one covered with Ta (10 at.%)‐doped nanosized titania powders, were prepared and studied. The sensors were tested at various concentrations of NO 2 , CO, and different hydrocarbons in the 450–650°C temperature range. The sensitivity to different target gases was found to be strongly dependent on the operating temperature. The replacement of Pt electrodes with Au was effective in promoting the response to propylene. Moreover, an inversion of the polarity of the electromotive force response to NO 2 gas was observed in comparison with Pt‐based sensors. The sensing mechanism is discussed.