Synthesis of nanocrystalline La-Pb-Fe-O perovskite and methanol-sensing characteristics
Synthesis of nanocrystalline La-Pb-Fe-O perovskite and methanol-sensing characteristics
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DOI：
10.1016/j.snb.2011.11.078
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发表时间：
2012-01-03
影响因子：
8.4
通讯作者：
Iacomi, F.
中科院分区：
文献类型：
--
作者：
Doroftei, C.;Popa, P. D.;Iacomi, F.
以聚乙烯醇为原料，采用新型溶胶-凝胶自燃烧法制备了纳米晶La0.8Pb0.2FeO3粉末。通过快速燃烧获得纳米级粉末。将获得的粉末压制成圆盘形状的样品，并在 900 摄氏度下热处理 40 毫米。使用 XRD 和 SEM-EDX 方法研究了样品的成分和微观结构，以及它们的电性能和对四种测试气体的响应。该化合物表现出斜方对称性（空间群Pnma），并在LaFeO3的类钙钛矿晶胞中结晶，为多孔粒状且均匀的结构，平均晶粒尺寸为250 nm，有效孔隙率为31%。 La0.8Pb0.2FeO3 传感器在 100-380 摄氏度的温度范围内对所有研究的气体都显示出 p 型半导体特性。La0.8Pb0.2FeO3 传感器对甲醇气体具有最佳的响应和选择性。 230 摄氏度时，对甲醇气体 (400 ppm) 的最高响应为 146.6。 (C) 2011 Elsevier B.V. 保留所有权利。
The nanocrystalline La0.8Pb0.2FeO3 powder was prepared by novel sol-gel self-combustion method using polyvinyl alcohol. The nanosized powders were obtained by quick combustion. From the obtained powder, pressed samples were executed in shape of disks, heat treated for 40 mm at 900 degrees C. The samples were investigated with regard to their composition and microstructure, using XRD and SEM-EDX methods, and their electric properties and response to four test gases. The compound exhibits the orthorhombic symmetry (space group Pnma) and crystallizes in the perovskite-like cell of LaFeO3, a porous granular and uniform structure with average grain size of 250 nm and an effective porosity of 31%. The La0.8Pb0.2FeO3 sensors show p-type semiconducting properties for all studied gases within the temperature range of 100-380 degrees C. The La0.8Pb0.2FeO3 sensors have the best response and selectivity to methanol gas. The highest response to methanol gas (400 ppm) is 146.6 at 230 degrees C. (C) 2011 Elsevier B.V. All rights reserved.