Highly selective low-temperature triethylamine sensor based on Ag/Cr₂O₃ mesoporous microspheres

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• 作者：Jun Cao^a ; ^bAuthor Vitae ; Yingming Xu^aAuthor Vitae ; Lili Sui^aAuthor Vitae ; Xianfa Zhang^aAuthor Vitae ; Shan Gao^a ; Author Vitae ; Xiaoli Cheng^aAuthor Vitae ; Hui Zhao^aAuthor Vitae ; Lihua Huo^a ; ^{lhhuo68@yahoo.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Triethylamine gas sensor ; Ag/Cr2O3 mesoporous microspheres ; Selectivity ; Low working temperature
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2015
• 出版时间：1 December 2015
• 年：2015
• 卷：220
• 期：Complete
• 页码：910-918
• 全文大小：2575 K

文摘

Cr₂O₃ mesoporous microspheres were synthesized via an ethanol solvothermal process and Ag/Cr₂O₃ microspheres were prepared by a surfactant-modified method. The two products were characterized by XRD, EDX, XPS, TEM and HRTEM techniques. The diameter of Cr₂O₃ microspheres was 1–1.5 μm, which were further constructed by the building blocks of nanoplates. The Ag/Cr₂O₃ microspheres kept the morphology and mesoporous structure of Cr₂O₃ microspheres and Ag nanoparticles were successfully deposited on the surface of Cr₂O₃ microspheres with the particle size of 7–25 nm. The gas sensing properties of the Cr₂O₃ and Ag/Cr₂O₃ microspheres to triethylamine (TEA) were measured at different working temperatures. The response of Cr₂O₃ microspheres to 50 ppm TEA was 15.2 at working temperature of 170 °C, while that of Ag/Cr₂O₃ increased to 52.9 at a lower temperature of 92 °C. The modification of Ag nanoparticles not only greatly lowered the optimum working temperature, enhanced the response of Cr₂O₃ microspheres to TEA gas, but also further improved the selectivity of the sensor to TEA. The significant improvement of Ag/Cr₂O₃ microspheres to TEA gas sensing property could be attributed to the modified Ag sensitization and catalytic effect, and mesoporous structure of Cr₂O₃ microspheres.