Superior triethylamine-sensing properties based on TiO₂/SnO₂ n-n heterojunction nanosheets directly grown on ceramic tubes

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• 作者：Hongyan Xu ; ^{mse_xuhy@ujn.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Judianxing JuAuthor Vitae ; Wenru LiAuthor 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 nanosheets ; TiO2 ; n&ndash ; n Heterojunctions ; Triethylamine ; Depletion layer
• 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：634-642
• 全文大小：3559 K

文摘

A highly sensitive and selective gas sensor towards triethylamine (TEA) has been successfully fabricated by designing n–n heterojunctions consisting of SnO₂ nanosheets and TiO₂ nanoparticles. The SnO₂ nanosheets with the thickness about 15 nm were directly grown on Al₂O₃ ceramic tubes by a simple hydrothermal process. After the formation of n–n heterojunctions by employing PLD method, the TiO₂ nanoparticle/SnO₂ nanosheets heterojunctions exhibit high sensing properties to TEA gas. The as-prepared ST3 (SnO₂/TiO₂ 3000) sensor response could reach to 52.3 at relatively low temperature (260 °C) when exposed to 100 ppm TEA gas, which is much higher than that of pure SnO₂ nanosheet sensor (∼3@100 ppm TEA@320 °C). Compared with the pure SnO₂ nanosheet sensor (S sensor), the depletion layer formed at the n–n heterojunctions interface in TiO₂/SnO₂ sensor can greatly increase the resistance in air and decrease the resistance in TEA gas. Due to the general working principle and controllable growth strategy, this work provides a way for developing the chemiresistive gas sensors.