Synthesis Of Nanocrystalline SnO2 Via Solgel

Two sol-gel synthesis routes (or precursors) are generally used for producing SnO2 thin films; first is the hydrolysis of tin alkoxide [8, 34, 74, 75] and the second is the hydrolysis of tin(IV) chloride [5, 6, 9-19, 21-26, 29, 30, 33, 37, 76]. SnO2 thin films can also be prepared from an aqueous SnO2 sol, which is synthesized via tin(IV) chloride hydrothermal treatment [16]. Semiconductor SnO2 gas sensor can be fabricated into three types of devices: (i) sintered block [12, 16, 19], (ii) thick film [27, 28], and (iii) thin film [5-11, 13-18, 20-24, 26, 29-31]. Of these, sintered block and thick-film devices have been commercialized successfully. Thin-film devices, however, have not been brought into practical use, in spite of their advantages claimed over the above devices, that is, (i) fast response, (ii) low fabrication cost, (iii) ease of miniaturization, and (iv) compatibility with microelectronic circuitry. It is suspected that this situation has resulted from a difference in the preparation technology for the gas sensing material.

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