Oxygen sensors based on SrTi0.65Fe0.35O3−δ thick film with MgO diffusion barrier for automotive emission control

Atomic Modeling and Electronic Structure of Mixed Ionic–Electronic Conductor SrTi1–xFexO3–x/2+δ Considered as a Mixture of SrTiO3 and Sr2Fe2O5

“…Moreover, the flexibility to accommodate partial substitutions on the A and/or B sublattices with cations of different valences provides a mechanism for tailoring ionic and electronic transport. , One representative example is SrTi 1– x Fe x O 3– y (STF), in which the B-site titanium atoms in the perovskite strontium titanate (SrTiO 3 ) are partially replaced by iron. STF is a functional material with a large mixed ionic–electronic conductivity and thus has potential in a wide range of applications, including cathodes − and anodes − for solid oxide fuel cells, gas sensors, − permeation membranes, − and catalysts. − …”

Highly selective sub–10 ppm H2S gas sensors based on Ag-doped CaCu3Ti4O12 films

“…It becomes clear that highly selective detection of H 2 S on scales lower than a few ppm is critical for human health, industry and environmental care. For these reasons, the direct gas-sensing of H 2 S has become an active research field, which explored among other working principles, the change of the electrical resistivity of the materials in response to H 2 S. Oxides [8][9][10][11] and various perovskites [12][13][14][15][16][17] are the most common materials used in gas sensors. BaTiO 3 nanoparticles containing ␣-Fe 2 O 3 can detect 0.4 ppm of H 2 S with response/recovery times equal to 50 s/100 s when operated at 150 • C [16].…”

SrTi0.65Fe0.35O3 nanofibers for oxygen sensing

“…Gas sensors, particularly oxygen sensors, play a key role in pollution control and fuel consumption efficiency enhancement in wide industrial fields, including automobile engine management, control of chemical processes and food processing plants [19]. The oxygen-sensing response of metal oxides such as TiO 2 , SrTiO 3 and CeO 2 , usually shows a crosssensitivity to temperature, which limits their practical use in many cases.…”

“…In previous works, STF35 oxygen sensors mostly took the form of thick film [19] or thin film [23]. In this work, STF35 nanofibers with an average diameter of~100 nm were synthesized by electrospinning, and oxygen sensors were fabricated of the STF35 nanofibers; in the temperature range of 700 to 780°C, the sensor based on STF35 nanofibers exhibited high sensitivity and fast response to atmospheres with different oxygen partial pressures.…”