Sol-gel is an extremely versatile technique to produce the nanocrystalline semiconductor oxide gas sensors. These characteristics may open many possibilities for wide development of gas sensors that are based on the sol-gel processing and that can be market competitive with the existing technologies and materials. Although the sol-gel technique has been associated with some disadvantages, the large number of advantages associated with it is continuously providing greater impetus for an advanced research to utilize this technique for the development of novel materials for novel applications.

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