Double Perovskite Oxide for Chemical Sensors

Chemical sensor technology is useful for monitoring environmental pollutions, controlling sustainable production systems and managing cultural heritage. The most promising devices are resistive sensors based on semiconductor metal oxides sensing materials because of their low cost, high sensitivity and quick response. Even though Perovskite oxides are promising sensing material due to their high thermal and chemical stability, their applicability is limited by their electrical conductivity and, consequently, their working temperature, that has to be high to guarantee a measurable electrical resistance. It is possible to overcame this problem by using an A-site layered ordering double Perovskite oxides, such as (Pr 0.5 Ba 0.5 )(Mn 0.9 Fe 0.1 )O 3 (PBMFO). The alternating layers of Pr+ ³ and Ba+ ² lead to layer-ordered oxygen vacancies by the layer of Pr+ ³ , that is the largest cation. The crystalline structure provide high electrical conductivity. This work is focused to optimize the operating conditions for autocombustion synthesis method in order to have performing sensing material for carbon monoxide.