Low-working-temperature, fast-response-speed NO₂ sensor with nanoporous-SnO₂/polyaniline double-layered film

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• 作者：Hongyan Xu ; ^{mse_xuhy@ujn.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Dianxing JuAuthor Vitae ; Wenru LiAuthor Vitae ; Haibo GongAuthor Vitae ; Jun ZhangAuthor Vitae ; Jieqiang WangAuthor Vitae ; Bingqiang Cao ; ^{mse_caobq@ujn.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：SnO2 nanoporous material ; Polyaniline ; Layered double thick film ; NO2 gas sensing
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：1 March 2016
• 年：2016
• 卷：224
• 期：Complete
• 页码：654-660
• 全文大小：2324 K

文摘

A SnO₂/polyaniline (PANI) double-layered film sensor for NO₂ detection was fabricated using nanoporous SnO₂ and PANI layers. The double layered film sensor has high selectivity and high response to NO₂ gas even with low concentration. Furthermore, the double layered film sensor also has a low optimum working temperature (140 °C) and high stability over a long working time period. The response and recovery time of sensor S₅P500 is as short as about 17 s and 25 s to 37 ppm NO₂ at 140 °C, respectively. The experiment results show that the porous characteristics of nanoporous SnO₂ and the thickness of PANI have effect on the sensor response of double layered film sensors. The improved sensing properties mainly attributes to the formation of depletion layer at the p–n junction interface in SnO₂/PANI double layered film sensor, which makes great resistivity difference in air and NO₂ gas. Thus, the combination of n-type SnO₂ thick film and p-type PANI thick film provides an effective strategy to design high property gas sensors.