Abstract
The present study describes undoped and Fe-doped tin dioxide thick films as selective ethanol vapor sensors. The undoped and Fe doped SnO2 powders were synthesized by using a facile co-precipitation route. The thick films of undoped and Fe-doped SnO2 were deposited by screen-printing technique and then sintered at 650°C for 2h. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX) techniques. The XRD studies reveal formation of nanocrystalline structure. The particle size of undoped and Fe (2 and 4mol%) doped SnO2 sintered powders were 17, 10 and 8nm, respectively. It was found that the response of SnO2 improved on addition of Fe. The 2mol% Fe doped SnO2 exhibits highest response toward ethanol at the operating temperature of 300°C with response and recovery time of 15 and 32s, respectively.
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