Abstract
Porous nanosized SnO2 powder has been synthesized by a simple nonaqueous sol gel method using SnCl2⋅2H2O and C2H5OH as precursors. Thermal stabilization of the gel is investigated by thermogravimetric/differential thermal analysis. SnO2 powder has been obtained by calcining the gel at 500°C for 3h and studied for its structural properties using x-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). XRD observations confirm the formation of rutile structured SnO2. On an average, 35nm size particles have been found in TEM micrographs of SnO2 powder. FESEM of the powder reveals the formation of a porous network formed by weak aggregation of nanoparticles. An attempt has been made to fabricate gas sensor by depositing thick SnO2 films on glass substrate. Gas sensing studies show that the sensing response of SnO2 sensor toward ammonia is comparatively higher at room temperature as compared to that toward acetone and ethanol.
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