Superior triethylamine-sensing properties based on TiO2/SnO2 n–n heterojunction nanosheets directly grown on ceramic tubes
Superior triethylamine-sensing properties based on TiO2/SnO2 n–n heterojunction nanosheets directly grown on ceramic tubes
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DOI：
10.1016/j.snb.2016.01.059
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发表时间：
2016-06
影响因子：
8.4
通讯作者：
Hongyan Xu;Judianxing Ju;Wenru Li;Jun Zhang;Jie-qiang Wang;Bingqiang Cao
中科院分区：
文献类型：
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作者：
Hongyan Xu;Judianxing Ju;Wenru Li;Jun Zhang;Jie-qiang Wang;Bingqiang Cao
通过设计SnO 2纳米片和TiO 2纳米颗粒组成的n-n异质结，成功制备了一种对三乙胺（TEA）具有高灵敏度和选择性的气体传感器。采用简单的水热法在Al 2 O3陶瓷管上直接生长了厚度约为15 nm的SnO 2纳米片。采用PLD法制备n-n异质结后，TiO 2纳米颗粒/SnO 2纳米片异质结对TEA气体具有良好的敏感性能。当暴露于100 ppm TEA气体时，所制备的ST 3（SnO 2/TiO 23000）传感器在相对较低的温度（260 °C）下的响应可以达到52.3，这远高于纯SnO 2纳米片传感器（SnO 2/TiO 23000）（在320 °C下在100 ppm TEA下的响应）。与纯SnO 2纳米片传感器（S传感器）相比，TiO 2/SnO 2纳米片传感器中n-n异质结界面处形成的耗尽层可显著增加空气中的电阻，降低TEA气体中的电阻。由于其一般的工作原理和可控的生长策略，本工作为化学电阻式气敏传感器的研制提供了一条途径。
A highly sensitive and selective gas sensor towards triethylamine (TEA) has been successfully fabricated by designing n–n heterojunctions consisting of SnO2nanosheets and TiO2nanoparticles. The SnO2nanosheets with the thickness about 15 nm were directly grown on Al2O3ceramic tubes by a simple hydrothermal process. After the formation of n–n heterojunctions by employing PLD method, the TiO2nanoparticle/SnO2nanosheets heterojunctions exhibit high sensing properties to TEA gas. The as-prepared ST3 (SnO2/TiO23000) 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 SnO2nanosheet sensor (∼3@100 ppm TEA@320 °C). Compared with the pure SnO2nanosheet sensor (S sensor), the depletion layer formed at the n–n heterojunctions interface in TiO2/SnO2sensor 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.