Use of Nanostructured Fe2O3:ZnO Film for Detection of Hydrogen.

A nanostructured gas sensors made of the Fe₂O₃:ZnO (60 : 40 wt %) composition were fabricated. The SEM image of the gas sensitive film showed that the particle sizes in the film are ranged from 20–50 nm. The gas sensitivity characteristics of the Fe₂O₃:ZnO sensor to hydrogen were studied at various operating temperatures (50–250°C) and in the presence of various hydrogen concentrations (75–2000 ppm) in the ambient air. The investigated Fe₂O₃:ZnO sensor showed sensitivity to hydrogen starting from a temperature of 50°C, and the maximum response was observed at an operating temperature of 100°C, at which the response exceeded 5000. The optimal combination of sensor gas sensitivity parameters was observed at an operating temperature of 200°C. [ABSTRACT FROM AUTHOR]