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The gas sensing properties of SnO2-based sensors in which the size of SnO2 crystallites was controlled by various dopants were investigated. It was found that the gas sensitivity to H2, CO or i-C4H10 increased as the SnO2 crystallite size decreased in the range below 10 nm. Quite high gas sensitivity was achieved at a crystallite size of ca. 5 nm.
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Xu et al. (1990) studied this question.
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