Direct hydrothermal growth of ZnO nanosheets on electrode for ethanol sensing

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• 作者：Dianxing JuAuthor Vitae ; Hongyan Xu ; ^{mse_xuhy@ujn.edu.cn" class="auth_mail}Author Vitae ; Jun ZhangAuthor Vitae ; Jing GuoAuthor Vitae ; Bingqiang Cao ; ^{mse_caobq@ujn.edu.cn" class="auth_mail}Author Vitae
• 关键词：Zinc oxide ; Nanosheets ; Hydrothermal ; Gas sensor ; Sensitivity
• 刊名：Sensors and Actuators B: Chemical
• 出版年：1 October 2014
• 年：2014
• 卷：201
• 期：Complete
• 页码：444-451
• 全文大小：2969 K

文摘

ZnO nanosheet microstructures have been directly grown on Al₂O₃ tube electrode by one-step hydrothermal method with different reaction times (3 h, 8 h and 12 h). The crystalline phase, morphology, and structure of the nanosheets are characterized by FESEM, TEM/SAED, and XRD. The results of FESEM reveal that ZnO nanosheets exhibit a sheet networks structure and a lager surface area. TEM/SAED images show a rough surface and a polycrystalline structure of ZnO nanosheets. X-ray diffraction indicated the ZnO architectures are well-crystallized in a hexagonal wurtzite structure. Gas sensing properties of the ZnO nanosheets show high response, fast response–recovery curves and long-term stability to 25–1000 ppm ethanol at appropriate temperature (400 °C), especially for sensor B (8 h). Moreover, the response of sensor B can get up to 38.4 for 100 ppm ethanol, and even 25 ppm ethanol could be well detected with a high response about 15 which is mainly attributed to the high surface area. This demonstrated the great potential application of ZnO nanosheets for developing gas sensors.