Synthesis and gas-sensing properties of nano- and meso-porous MoO3-doped SnO2
Synthesis and gas-sensing properties of nano- and meso-porous MoO3-doped SnO2
复制标题
DOI：
10.1016/j.snb.2010.03.021
复制
发表时间：
2010-06-03
影响因子：
8.4
通讯作者：
Shimizu, Yasuhiro
中科院分区：
文献类型：
--
作者：
Firooz, Azam Anaraki;Hyodo, Takeo;Shimizu, Yasuhiro
以五水氯化锡(SnCl4中心点5H(2)O)、七钼酸铵和聚甲基丙烯酸甲酯(PMMA)微球为模板，采用超声喷雾热解法制备了掺杂和不掺杂1~10wt%MoO_3的SnO_2纳米和介孔SnO_2粉末，研究了MoO_3掺杂和PMMA微球的加入对SnO_2的结构、形貌和气敏性能的影响。通过X射线衍射仪、扫描电子显微镜、透射电子显微镜的分析，证实了控制前驱体溶液中PMMA微球的量是实现SnO2纳米和介孔结构的有效方法。X射线光电子能谱，以及使用N-2吸附等温线测量比表面积和孔径分布。用丝网印刷方法制备了厚膜(厚约50微米)，在空气中测试了它们对不同气体(NO2、C2H5OH和H-2)的气敏特性。在纳米和介孔结构的SnO2中掺杂10wt%MoO_3的情况下，掺杂厚膜对5ppm的NO_2气体表现出很高的响应和选择性。我们观察到，SnO2晶格中Mo物种的存在可以提高传感器对NO2气体的响应和选择性。讨论了MoO_3掺杂对薄膜对NO2气敏特性的影响。(C)2010爱思唯尔B.V.保留所有权利。
Nano- and meso-porous SnO2 powders doped with and without 1-10 wt% MoO3 have been synthesized by an ultrasonic spray-pyrolysis method employing a precursor aqueous solution containing tin (IV) chloride pentahydrate (SnCl4 center dot 5H(2)O), ammonium heptamolybdate and polymethylmethacrylate (PMMA) microspheres as a template, and the effects of MoO3-doping and the addition of PMMA microspheres on the structural, morphological and gas-sensing properties of SnO2 were investigated in this study. It is confirmed that control of the amounts of PMMA microspheres in the precursor solution was effective in realizing well-developed nano- and meso-porous structures of SnO2 by X-ray diffraction analysis, scanning electron microscopy, transmission electron microscopy. X-ray photoelectron spectroscopy, and the measurement of specific surface area and pore size distribution using a N-2 adsorption isotherm. Gas-sensing properties of their thick films (about 50 mu m thick), which were fabricated by screen-printing to various gases (NO2, C2H5OH and H-2) were tested in ambient air. The doped thick films showed a high response and selectivity to 5 ppm NO2 gas in the case of 10 wt% MoO3-doping in both nano- and meso-porous structures of SnO2. We observed that the presence of Mo species in SnO2 lattice can improve the sensor response and selectivity towards NO2 gas. The effect of the MoO3-doping on the sensing characteristics of these films towards NO2 was discussed. (C) 2010 Elsevier B.V. All rights reserved.