| abstract |
A gas-sensitive material is disclosed for detecting CO 2 for use in semiconductor-based gas sensors. The gas-sensitive material may comprise one or more Ba-containing phases and one or more W-containing phases, at least one of the Ba-containing phases being different than at least one of the W-containing phases; the one or more Ba-containing phases comprising at least one of BaCO 3 , BaO-rich glass, BaWO 4 , or any combination thereof; and the one or more W-containing phases comprising at least one of BaWO 4 , WO 3 , W(OH) 6 , or any combination thereof. The material may further comprise one or more oxides selected from the group CuO, Bi 2 O 3 , Sb 2 O 3 , Sb 2 O 5 , La 2 O 3 , Cr 2 O 3 , Fe 2 O 3 , NiO, and TiO 2 , and any combination thereof. The material may further comprise one or more dopants such as Pt, Pd, Ag, Au or their compounds, and any combination thereof. In one embodiment, the material comprises a mixture of BaO-rich glass, BaWO 4 , and WO 3 . In another embodiment, the material comprises a mixture of at least one of BaCO 3 or BaO-rich glass in combination with at least one of WO 3 or W(OH) 6 . Transducers and sensors incorporating such gas-sensitive materials are also disclosed. |