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Revista mexicana de física
Print version ISSN 0035-001X
Abstract
DHANNASARE, S. B.; YAWALE, S. S.; UNHALE, S.B. and YAWALE, S.P.. Application of nanosize polycrystalline SnO2-WO3 solid material as CO2 gas sensor. Rev. mex. fis. [online]. 2012, vol.58, n.6, pp.445-450. ISSN 0035-001X.
Among binary metal oxide sensors, tin oxide based sensors have received more attention, due to its high reactivity to many gases. The nanosize SnO2-WO3 polycrystalline solid material of different mol% was prepared to form thin films by screen printing method. The sensitivity of the films is measured for different concentration of CO2 gas at room temperature (303K). The variation of sensitivity with CO2 gas concentration is found to be linear. The sensor 40SnO2-60WO3 shows maximum sensitivity in presence of CO2 gas. The static and dynamic response of the sensors was studied. The reproducibility and stability for all sensors was good. The average crystallite size was calculated from XRD spectra and found to be of the order of 17.11 to 17.17 nm except pure WO3 film has 22.91 nm.
Keywords : Tungsten oxide; screen-printing technique; carbon dioxide gas; SnO2-WO3; sensitivity.