HIGH-T-C SUPERCONDUCTORS AS NO SENSOR MATERIALS - A GENERAL INVESTIGATION

[摘要] The response of several ceramic high-ir, superconductors to NO and CO in Taguchi-type gas sensors has been investigated. YBa2Cu3O7-delta decomposes in the presence of NO. Ba1.5La1.5Cu3Ox and La1.85Sr0.15CuOx do not show any sensitivity or selectivity of interest. Nd1.85Ce0.15CuO4-x exhibits sensitivity to CO, but no sensitivity to NO. These materials are not suitable for NO gas sensors. Bi2Sr2CuO6+x, Bi2Sr2CaCu2O78+x and Bi1.8Pb0.2Sr2Ca2Cu3O10+x show high selectivity to NO against CO. They are promising materials for Taguchi-type NO sensors. Bi2Sr2CaCu2O8+x exhibits the best properties. The sensitivities of composites of Bi2Sr2CaCu2O8+x with 0.5, 2 and 10 wt.% Al2O3, Bi2Sr2CaCu2O8+x with 20 wt.% Fe2O3, Bi2Sr2CaCu2O8+x with 20 wt.% NiO, Bi2Sr2CaCu2O8+x with 20 wt.% ZrO2, Bi2Sr2CaCu2O8+x with 50 wt.% Sb2O5 and the lithium-intercalated compound Li0.11Bi2Sr2CaCu2O8+x to NO and CO at 300 and 350 degrees C have been studied. While additions of Al2O3, ZrO2 and Sb2O5 to Bi2Sr2CaCu2O8+x do not improve its selectivity to NO against CO, additions of Fe2O3 and NiO and lithium intercalation do improve the selectivity.

[发布日期] 1994-12-01

[关键词] HIGH-T-C SUPERCONDUCTORS;NITROGEN OXIDE SENSORS