In this work SnO2 nanoparticles were obtained by the polimeric precursor method and characterized by X-ray diffraction, gas adsorption and desorption isotherms, scanning electron microscopy and transmission electron microscopy. Only the cassiterite (tetragonal) phase was observed. The obtained material presents a high surface area and high porosity. These characteristics are prerequisites for a good gas sensor. The NOx sensibility was studied in the temperature range between 200 and 500 °C. A low sensibility between 200 to 350 °C is also observed; however, starting from 400 °C, an increase of three times in the sensor sensibility occurs. The maximum sensibility was measured at 400 °C with a response time of 730 s.
nanoparticles; SnO2; gas sensors
