Gas sensing characteristics of novel twin-layered SnO2 nanoarray fabricated by substrate-free hydrothermal route
Gas sensing characteristics of novel twin-layered SnO2 nanoarray fabricated by substrate-free hydrothermal route
复制标题
无基底水热法制备新型双层 SnO2 纳米阵列的气敏特性
DOI：
10.1016/j.snb.2015.04.111
复制
发表时间：
2015-10-31
影响因子：
8.4
通讯作者：
Zhao, Heyun
中科院分区：
文献类型：
--
作者：
Luo, Li;Jiang, Qiuping;Zhao, Heyun
采用无衬底水热法，以锡酸钠和氢氧化钠为原料，在190℃下反应48h，合成了具有良好取向的双层SnO2纳米棒阵列。形貌和结构表征结果表明，所合成的纳米棒阵列可以很好地表征四方相SnO2纳米棒的直径为20 nm，长度为数百纳米。双层SnO2纳米棒阵列由两层纳米棒阵列紧密结合在一起，中间有明显的界面。对不同挥发性有机物的气敏特性研究结果表明，基于SnO2纳米阵列的传感器在250℃的工作温度下对异丙醇具有最高的气敏性能，对异丙醇的响应和恢复非常快，在278℃和300℃的工作温度下对乙醇和丙酮也有良好的气敏性能。增强的响应归因于气体传输通道数量的增加导致更有效的表面积，以及由于双层SnO2定向纳米棒阵列的纳米棒/纳米棒结处的势垒而对传感器电阻的额外调制。(C)2015爱思唯尔B.V.保留所有权利。
Novel twin-layered SnO2 well-oriented nanorods arrays have been synthesized by a substrate-free hydrothermal route of using sodium stannate and sodium hydroxide at 190 degrees C for 48 h. The characteristic results of the morphology and structure show that the synthesized nanoarray can be well indexed to tetragonal phase SnO2 nanorods with a diameter of 20 nm and length of several hundred nanometers. The twin-layered SnO2 nanorods array was tightly combined together by two layers of nanrods array with an apparent interface in the center. The results of the gas-sensing characteristics for various volatile organic compounds show that the sensor based on layered SnO2 nanoarray exhibits the highest gas sensitivity, very fast response and recovery to isopropanol at the operating temperature of 250 degrees C, and good gas-sensing performances to ethanol and acetone have also been found at the operating temperature of 278 and 300 degrees C, respectively. The enhanced response is attributed to the numbers of the gas transport channels increasement leading to more effective surface areas and the additional modulation of the sensor resistance due to the potential barrier at nanorod/nanorod junctions of twin-layered SnO2 well-oriented nanorods array. (C) 2015 Elsevier B.V. All rights reserved.