Ultrasensitive and highly selective detection of methoxy propanol based on Ag-decorated SnO₂ hollow nanospheres

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• 作者：Meihua Li^a ; ^bAuthor Vitae ; Huichao Zhu^a ; ^{zhuhuichao@dlut.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Bin Wang^cAuthor Vitae ; Jing Cheng^dAuthor Vitae ; Weiping Yan^a ; ^{yanwp@dlut.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Shufeng Xia^aAuthor Vitae ; Zhenan Tang^aAuthor Vitae
• 关键词：SnO2 hollow nanosphere ; Metallic silver ; Methoxy propanol ; Catalytic effect ; Gas sensing mechanism
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：232
• 期：Complete
• 页码：545-556
• 全文大小：4483 K

文摘

Ag-decorated SnO₂ hollow spheres with different mass ratios were synthesized through a two-step synthesis route. The morphology of as-prepared materials was characterized via FESEM and TEM microscopes, and the results proved the rough and porous spherical structures. The EDX and XPS patterns verified the elementary composition, especially for Ag/SnO₂, the standard peaks of Ag were obviously observed. The N₂ isotherm of SnO₂ hollow spheres belongs to a type-IV isotherm with a large type H3 hysteresis loop. The pore size distribution covered a range of 35–80 nm and the sample showed a high BET surface area of 31.91 m²/g. During the systematic examinations of gas sensing performance, 5 wt% Ag/SnO₂ showed superior properties, including the ultrahigh response of over one hundred to methoxy propanol within a wide concentration range and the excellent selectivity for detecting methoxy propanol among other gases. Moreover, the synthesis mechanism and gas sensing mechanism were discussed, which indicated that both the morphology of SnO₂ hollow spheres and the catalytic effect of Ag nanoparticles played important roles on the gas sensing properties, and could be used for the further design of gas sensor utilizing other oxide semiconductors.