Thick films prepared with undoped nanometric SnO2 particles and with (Co, Nb, Fe)-doped SnO2 were studied with the purpose of developing oxygen and carbon monoxide gas sensors. The ceramic powders were obtained through the Pechini method. The morphological characteristics were studied with SEM and TEM, after which, they were subjected to sensitivity tests under different atmospheres. A correlation was established between the microstructure of the material, the effects of the additives, and the electrical behavior. The response of the sensor could be explained as the result of the characteristics of the intergranular potential barriers developed at intergrains. It was determined that the SnO2-doped films have a greater sensitivity between 200 °C and 350 °C.
SnO2 Oxygen Vacancy Co3O4 Barrier Height Nb2O5
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The authors express their thanks to CONICET and to the National University of Mar del Plata for their financial support and to Héctor Ascencio for his technical assistance.