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High Sensor Response and Short Response Time of Ozone Sensor Using Au/TiO2–SnO2 Material at Room Temperature

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Various ratios of TiO2–SnO2 sensing materials were prepared from TiO2 and Tin(II) 2-ethylhexanoate in air. Au was also added to TiO2–SnO2 materials to detect ozone concentration by the photoreductive method. The prepared samples were characterized using scanning electron microscopy (SEM), transmission electron microscope (TEM), and X-ray diffraction (XRD) techniques. The mixture with a TiO2–SnO2 ratio of 1:4 had the highest sensor response of 327, and the sensor head worked at room temperature. Doping 0.5 wt% Au into 1:4 TiO2–SnO2 boosted the ozone response to 6.6 × 106 (about 104 times), and the response and recovery times decreased by 35 and 5 s, respectively. The ozone sensor's characteristics were explained through the mechanism of adsorption, photoreduction, desorption, and surface reaction processes of ozone.
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Keywords: AU/TIO2-SNO2; OZONE SENSOR; PHOTOREDUCTIVE METHOD; ROOM WORKING TEMPERATURE

Document Type: Research Article

Publication date: August 1, 2010

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