Impact of Nb doping on gas-sensing performance of TiO₂ thick-film sensors

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• 作者：Wen Zeng^a ; ^{wenzeng@cqu.edu.cn}  ; [Author Vitae] ; Tianmo Liu^a  ; [Author Vitae] ; Zhongchang Wang^b ; ^{zcwang@wpi-aimr.tohoku.ac.jp}  ; [Author Vitae]
• 关键词：TiO2 ; Nb doping ; Volatile organic compounds ; Oxygen adsorption
• 刊名：Sensors and Actuators B ; Chemical
• 出版年：2012
• 期刊代码：161_09254005
• 类别：et
• 出版时间：20 May, 2012
• 卷：166-167
• 期：Complete
• 页码：141-149
• 文件大小：1570 K

摘要

Using a simple hydrothermal method, the pristine and Nb doped TiO₂ is prepared, and their microstructures and gas-sensing responses to the harmful volatile organic compounds are investigated with a special focus on the impact of Nb additive. We find that the gas response of TiO₂ is enhanced significantly by doping Nb, which is understood in theory upon proposed adsorption models. Combining experimental measurements with first-principles calculations, the working mechanism underlying such improvement in gas-sensing functions by the Nb additive is discussed.