Enhanced gas sensing properties of hierarchical SnO₂ nanoflower assembled from nanorods via a one-pot template-free hydrothermal method

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• 作者：Qiong Wang ; ^{q_wang@cauc.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Na Yao ; Dongmin An ; Yan Li ; Yunling Zou ; Xiaoxue Lian ; Xiaoqiang Tong
• 关键词：SnO2 ; Self-assembly ; Hydrothermal synthesis ; Nanoflower ; Gas sensor
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 November 2016
• 年：2016
• 卷：42
• 期：14
• 页码：15889-15896
• 全文大小：2337 K

文摘

Well-defined three-dimensional (3D) hierarchical tin dioxide (SnO₂) nanoflowers with the size of about 200 nm were successfully synthesized by a simple template-free hydrothermal method. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and N₂ adsorption-desorption analyses were used to characterize the structure and morphology of the products. The as-synthesized full crystalline and large specific surface area SnO₂ nanoflowers were assembled by one-dimensional (1D) SnO₂ nanorods with sharp tips. A possible self-assembly mechanism for the formation the SnO₂ nanoflowers was speculated. Moreover, gas sensing investigation showed the sensor based on SnO₂ nanoflowers to exhibit high response and fast response-recovery ability to detect acetone and ethanol at an operating temperature lower than 200 °C. The enhancement of gas sensing properties was attributed to their 3D hierarchical nanostructure, large specific surface area, and small size of the secondary SnO₂ nanorods.