Abstract
The CO 2 sensitivity of a La-doped SnO 2 thick film was characterized with variation of the La 2O 3 content up to 4.5 mol%. Effects of mechanical milling of SnO 2 powders on the CO 2 sensitivity of a SnO 2 thick film sensor were also studied. When exposed to 1000 ppm of CO 2, the sensitivity of a SnO 2 thick film sensor was improved from 1.14 to 1.52 with increasing the La 2O 3 doping concentration from 0 mol% to 2.2 mol%. Enhanced sensitivities of 1.45–1.51 were obtained for the thick film sensors processed with mechanically milled SnO 2 powders.
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