Gas reception and signal transduction of neat tin oxide semiconductor sensor for response to oxygen

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• 作者：Noboru Yamazoe ; Koichi Suematsu ; Kengo Shimanoe
• 关键词：Gas sensor ; Tin oxide ; Depletion ; Receptor ; Transducer ; Moisture
• 刊名：Thin Solid Films
• 出版年：2 December, 2013
• 年：2013
• 卷：548
• 期：Complete
• 页码：695-702
• 全文大小：1405 K

文摘

The basic schemes of gas reception and signal transduction recently proposed for oxide semiconductor gas sensors have been shown to apply well to the quantitative analysis of the oxygen response behavior observed with a neat SnO₂ sensor under various humidity conditions at 623 K. It was shown that O^{2 鈭?/sup> ions are preferably formed under a very dry condition but their formation is strongly suppressed in the presence of slight amounts of moisture through blocking of adsorption sites and induction of threshold pressure, and is replaced by the formation of O鈭?/sup> ions. To make the situation more complex, the formation of these ions was increasingly enhanced with increasing humidity of pretreatment ambient at elevated temperature (hysteresis), which is considered to result from surface restructuring having taken place in the pretreatments. Through these results, chemical properties and stabilities of grain surface, beside physical properties of the grains, were shown to be critically important for gas sensing properties.}