Synthesis and gas sensing properties of hierarchical SnO2 nanostructures
Synthesis and gas sensing properties of hierarchical SnO2 nanostructures
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DOI：
10.1016/j.snb.2012.11.043
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发表时间：
2013-10
影响因子：
8.4
通讯作者：
P. Sun;Xiaodong Mei;Yaxin Cai;Ma Jian;Yanfeng Sun;Xishuang Liang;Fengmin Liu;G. Lu
中科院分区：
文献类型：
--
作者：
P. Sun;Xiaodong Mei;Yaxin Cai;Ma Jian;Yanfeng Sun;Xishuang Liang;Fengmin Liu;G. Lu
介绍了一种低成本、环境友好的水热法合成SnO2纳米结构的方法。采用多种表征技术对产物的结构和形貌进行了表征。结果表明，这些纳米结构是由厚度约为8 nm的二维（2D）纳米片构建的。盐酸的用量对最终产物的尺寸和形貌的控制起着至关重要的作用。制备了基于分级结构SnO2纳米结构的气敏元件，并测试了其对乙醇、丙酮、甲醛、CO、甲苯、H2和H2S气体的气敏特性。该传感器对乙醇具有良好的选择性。在乙醇浓度为100 ppm时，分级SnO2纳米片的响应约为33，比纳米颗粒高约2.5倍。在275 ° C的最佳工作温度下，传感器对60 ppm乙醇的响应时间小于11 s。气敏性能的提高归因于其独特的结构。
A low-cost and environmentally friendly hydrothermal route to the synthesis of hierarchical SnO2nanostructures was described. The structure and morphology of the as-prepared product were characterized by various characterization techniques. The results revealed that these nanostructures were built from two-dimensional (2 D) nanosheets with the thicknesses of about 8 nm. Moreover, the amount of hydrochloric acid played a crucial role in the control of the final size and morphology of product. Gas sensors based on hierarchical SnO2nanostructures were fabricated, and their gas sensing properties were tested for response to ethanol, acetone, formaldehyde, CO, toluene, H2and H2S gases. The sensor showed excellent selectivity toward ethanol. At an ethanol concentration of 100 ppm, the response of the hierarchical SnO2nanosheets was about 33, which was about 2.5 times higher than that of the nanoparticles. The response time of the sensor to 60 ppm ethanol was shorter than 11 s at the optimal operating temperature of 275 °C. The enhancement in gas sensing properties was attributed to their unique structures.