A Novel Promising Sensing Properties of Sprayed Ternary Co 2SnO 4 Towards Ethanol Vapours

Abstract

For the first time Cubic spinel Cobalt Stannate Co₂SnO₄ (CTO) nanomaterial elaborated by spray pyrolysis root and used as sensitive layer for ethanol (C₂H₅OH) vapours detection. The response of layer towards low, medium and high ethanol concentrations exhibited a stable behaviour under dry and humid atmospheres at the optimal working temperature of 150 °C, which is relatively low temperature if we compared to those of the conventional semiconductor gas sensors. The morphology and structure of the elaborated layer were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Energy Dispersive X-ray Spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The characteristics results allow us to propose a detection mechanism involving CO₂ as intermediate reactive molecules. According to its stable and acceptable sensing response, Co₂SnO₄ could be considered as a promising sensitive layer for ethanol sensors devices at low and high humidity rates.