Synthesis of three-dimensionally ordered macroporous LaFeO3 with enhanced methanol gas sensing properties
Synthesis of three-dimensionally ordered macroporous LaFeO3 with enhanced methanol gas sensing properties
复制标题
具有增强甲醇气体传感性能的三维有序大孔LaFeO3的合成
DOI：
10.1016/j.snb.2014.12.046
复制
发表时间：
2015-03-31
影响因子：
8.4
通讯作者：
Liang, Yanqin
中科院分区：
文献类型：
--
作者：
Qin, Jian;Cui, Zhenduo;Liang, Yanqin
采用简单的PMMA模板法合成了三维有序大孔(3DOM)LaFeO3。用扫描电子显微镜、X射线衍射仪和透射电子显微镜对产物的结构、形貌和组成进行了表征。产物呈长程有序六方排列，形成反蛋白石纳米结构。3DOM LaFeO_3的比表面积几乎是块体LaFeO_3的两倍。系统地研究了3DOM LaFeO_3的甲醇气敏性能。所制备的样品在150-300℃的温度范围内对所有被测气体都显示出p型半导体性质。3DOM LaFeO_3具有最高的气体响应(高达96)和190℃下最快的响应-恢复时间。此外，它对甲醇表现出优异的选择性。这种气敏性能的提高归功于其有序的大介孔结构、大的比表面积、大量的表面活性中心和氧空位。(C)2014爱思唯尔B.V.保留所有权利。
Three-dimensionally ordered macroporous (3DOM) LaFeO3 was synthesized by a simple PMMA template method. The structure morphology and composition of as-prepared products have been characterized by SEM, XRD, and TEM. The products show long-range ordered hexagonal arrangement forming an inverse opal nanostructure. The surface area of 3DOM LaFeO3 is almost twice larger than that of bulk LaFeO3. The methanol gas sensing performance of 3DOM LaFeO3 was systemically studied. The as-performed samples show p-type semi-conducting properties for all the tested gases within the temperature range of 150-300 degrees C. The 3DOM LaFeO3 shows the highest gas response (as high as 96) and the fastest response-recovery times at 190 degrees C. In addition, it shows superior selectivity to methanol. This enhancement in gas-sensing properties is attributed to its ordered macro-mesoporous structure, large surface area, numerous surface active sites and oxygen vacancies. (C) 2014 Elsevier B. V. All rights reserved.