Abstract
In the present work, gas-sensing properties of flame-spray-made Co-doped SnO2 nanoparticles are systematically studied for detection of nitric oxide (NO), acetone (C3H6O) and ethanol (C2H5OH) gases occurred in human breathe. Structural characterizations by electron microscopy and X-ray analysis confirmed the formation of loosely agglomerated SnO2 nanoparticles (5–20nm) with highly crystalline tetragonal-cassiterite SnO2 structure and Co substitutional doping with Co2+ and Co3+ oxidation states. The gas-sensing properties of unload SnO2 and Co-doped SnO2 sensors were systematically tested towards NO, acetone and ethanol. Tested results indicated that small Co-doping levels in the range of 0.2–0.5wt% led to enhanced sensing properties toward NO, acetone and ethanol compared with undoped one. In particular, 0.2wt% Co-doped SnO2 sensor showed very high response of ∼1637–1000ppm NO at 350°C while 0.5wt% Co-doped SnO2 one exhibited high responses of ∼660–2000ppm acetone and ∼806–1000ppm ethanol. Thus, Co-doped SnO2 sensors are potential for responsive detections of NO, acetone and ethanol at ppm-level but with limited selectivity and may be useful for general environmental, industrial and biomedical applications.
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