Selectivity of Ti-doped In₂O₃ ceramics as an ammonia sensor

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• 作者：Pengfeng Guo and Haibo Pan
• 关键词：In₂O₃ ; Ammonia sensor ; Selectivity ; Sensing mechanism
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2006
• 出版时间：26 April 2006
• 年：2006
• 卷：114
• 期：2
• 页码：762-767
• 全文大小：366 K

文摘

Nanoscale In₂O₃ powders doped with titanium were prepared by using InCl₃·4H₂O as a source matter. The materials doped with Ti⁴⁺ ions obviously showed the enhanced selectivity to ammonia sensor, compared with two reducing gases of H₂ and CO, in the concentration range of 5–1000 ppm at a low operating current (165 mA, equal to 145 °C). Characterization of the materials was performed by thermal analysis, XRD, BET, FTIR, and magnetic susceptibility measurement. The mechanism of the selective gas sensing is proposed on the basis of the differences in gas molecular structure for adsorption and activation.