Highly selective detection of trace hydrogen against CO and CH₄ by Ag/Ag₂O-SnO₂ composite microstructures

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• 作者：Hui-Hui LiAuthor Vitae ; Yi HeAuthor Vitae ; Pan-Pan JinAuthor Vitae ; Yang CaoAuthor Vitae ; Mei-Hong FanAuthor Vitae ; Xiaoxin ZouAuthor Vitae ; Guo-Dong Li ; ^{lgd@jlu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{lifind@21cn.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Ag/Ag2O&ndash ; SnO2 ; Composite ; Porous ; Hydrogen ; Gas sensor
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：2 June 2016
• 年：2016
• 卷：228
• 期：Complete
• 页码：515-522
• 全文大小：2406 K

文摘

Both response and selectivity are key issues for a gas sensing material. Here, we presented a porous Ag/Ag₂O–SnO₂ composite with excellent sensing performance towards hydrogen. The optimal weight ratio of Ag to SnO₂ was 3 wt% in the Ag/Ag₂O–SnO₂ composite, which gave the highest response of 40–200 ppm hydrogen at 170 °C. And what is more, it was nearly insensitive to carbon monoxide and methane at this temperature. The porous microspheres composite exhibited high response and rapid response (less than 5 s) to trace amount of hydrogen. The high response and excellent selectivity of this composite could be attributed to the high catalytic activity of Ag/Ag₂O nanoparticles built on the surface of SnO₂ microspheres, the Schottky barrier and low working temperature.