Highly sensitive and selective trimethylamine sensors using Ru-doped SnO₂ hollow spheres

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• 作者：Kang-Min Kim  ; [Author Vitae] ; Kwon-Il Choi  ; [Author Vitae] ; Hyun-Mook Jeong  ; [Author Vitae] ; Hyo-Joong Kim  ; [Author Vitae] ; Hae-Ryong Kim  ; [Author Vitae] ; Jong-Heun Lee ; ^{jongheun@korea.ac.kr} ; ^{leejongheun@gmail.com}  ; [Author Vitae]
• 关键词：Ru&ndash ; SnO2 ; Hollow spheres ; Trimethylamine ; Gas sensors
• 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：733-738
• 文件大小：1851 K

摘要

The 0.45 mol%Ru-doped SnO₂ (Ru-SnO₂) hollow spheres, each with a shell thickness of 鈭?7 nm, were prepared by the uniform coating of Ru- and Sn-precursors onto SiO₂ microspheres with diameters of 鈭?00 nm, followed by heat treatment at 350 掳C and subsequent removal of the core SiO₂ using a dilute HF solution. The Ru-SnO₂ hollow spheres showed high responses to 5 ppm trimethylamine (TMA) at 350 掳C with negligible cross-responses to toluene, benzene, NH₃, CO, H₂, and C₃H₈ and decreased cross-responses to C₂H₅OH, while undoped SnO₂ hollow spheres showed similar responses to TMA and C₂H₅OH. The selective and sensitive detection of TMA that was achieved in Ru-doped SnO₂ hollow spheres is explained in relation to the catalytic sensitization of Ru and the gas-accessible hollow morphology of the thin shell configurations.