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This paper describes how thick-film technology was used to fabricate small, robust, sensitive, and selective semiconductor metal oxide (SMO) sensors to detect traces of ethanol vapours in air. The sensing parameters of several active layers were studied including: sensitivity, response repeatability, stability and selectivity. The response to different species of five differently doped SnO₂ sensors and a commercially available one were measured at concentrations between 1ppb and 1000ppm. Interaction was extremely high when ethanol came into contact with the Pt-doped SnO₂ surface. The change in resistance of the Pt-doped sensors was between 2 and 55 times higher than the change in the commercial one. The Pt-doped SnO₂ material is less resistant, more sensitive and shows faster response to ethanol than pure SnO₂. Since the detection limit for ethanol is at sub-ppb level, the fabricated sensors could be …