SnO2 thin films used as ammonia sensing layers at room temperature
1 Laboratoire de la Matière Condensée et Nanostructures, Université Cadi Ayyad, Faculté des Sciences et Techniques, Guéliz, Marrakech, Maroc
2 Laboratoire de Chrono-Environnement UMR 6249, Université de Franche-Comté, Besançon, France
3 Laboratoire de Chimie Bioorganique et Macromoléculaire, Université Cadi Ayyad, Faculté des Sciences et Techniques, Guéliz, Marrakech, Maroc
Gas sensors based on the SnO2 thin films were prepared by dip-coating method starting from their corresponding sols. The as-elaborated thin coatings were afterwards annealed at different temperatures during various times. Their morphology, composition and microstructure were characterized by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffraction (XRD). The results of electrical and sensing measurements indicated that the sensor annealed at 300°C for 3 hours exhibited the best sensitivity towards the detection of NH3 at room temperature.
© Owned by the authors, published by EDP Sciences, 2013
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