Ultra-long Zn2SnO4-ZnO microwires based gas sensor for hydrogen detection
Ultra-long Zn2SnO4-ZnO microwires based gas sensor for hydrogen detection
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DOI：
10.1016/j.apsusc.2016.12.221
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发表时间：
2017-04-01
影响因子：
6.7
通讯作者：
Shen, Yanbai
中科院分区：
文献类型：
--
作者：
Fan, Hong;Xu, Shucong;Shen, Yanbai
以SnO 2、ZnO和C粉为原料，采用热蒸发法制备了Zn 2SnO 4-ZnO超细线。通过X射线衍射、扫描电子显微镜和能量色散X射线能谱等手段对材料的微观结构进行了表征，结果表明，Zn_2SnO_4-ZnO微丝的直径为2.8-3.2 μ m，长度为4.0-4.2 mm，具有良好的结晶性。Zn 2SnO 4-ZnO微丝的最大长径比约为1500。Zn 2SnO 4-ZnO微丝对H-2的敏感特性表明，该传感器不仅具有良好的可逆性，而且响应与H-2浓度呈良好的线性关系。响应时间和恢复时间随工作温度的升高而减小。在300摄氏度的工作温度下实现了9.6至1000 ppm H-2的最高传感器响应。用电子耗尽理论解释了Zn 2SnO 4-ZnO微丝表面H-2分子的化学吸附和反应机理。(C)2016爱思唯尔B. V.保留所有权利。
Ultra-long Zn2SnO4-ZnO microwires were synthesized by thermal evaporation of the mixture of SnO2, ZnO and C powders. Microstructural characterization by means of X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy showed that Zn2SnO4-ZnO microwires with excellent crystallinity were 2.8-3.2 mu m in diameter and 4.0-4.2 mm in length. The maximal length-to-diameter ratio of Zn2SnO4-ZnO microwires is approximately 1500. H-2 sensing properties showed that Zn2SnO4-ZnO microwires exhibited not only excellent reversibility to H-2, but also a good linear relationship between the sensor response and H-2 concentration. The response time and recovery time decreased as the operating temperature increased. The highest sensor response of 9.6 to 1000 ppm H-2 was achieved at an operating temperature of 300 degrees C. The electron depletion theory was used for explaining H-2 sensing mechanism by the chemical adsorption and reaction of H-2 molecules on the surface of Zn2SnO4-ZnO microwires. (C) 2016 Elsevier B.V. All rights reserved.