Abstract
A smart carbon dioxide gas sensor was developed by the combination of Al3+ ion conductor [(Al0.2Zr0.8)20/19Nb(PO4)3] and O2− ion conductor [(8 mol%)Y2O3–ZrO2, YSZ] with the refractory Li2CO3-doped La2O2SO4 solid solution as the gas detecting auxiliary electrode. Here, the two layered solid electrolyte pellet was preliminarily fabricated by using the Al3+ ion and the O2− ion conductor powders and then the pellet was pressed and finally sintered. The sensor response was very quick within several seconds, with showing a long term stability over 100 days. The size of the present sensor tip is designed as small as 2 mm×3 mm×1 mm.
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