Structural, morphological and gas sensing properties of undoped and Lanthanum doped nanocrystalline SnO2
Structural, morphological and gas sensing properties of undoped and Lanthanum doped nanocrystalline SnO2
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DOI：
10.1016/j.ceramint.2013.07.136
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发表时间：
2014-01-01
影响因子：
5.2
通讯作者：
Suryavanshi, S. S.
中科院分区：
文献类型：
--
作者：
Chikhale, L. P.;Paul, J. Y.;Suryavanshi, S. S.
采用化学共沉淀法成功合成了未掺杂和掺杂镧的纳米二氧化锡粉体。采用TGA-DTA、XRD、TEM、SEM、EDAX、FTIR、Raman和UV-vis等技术表征了样品的各种理化性质。采用丝网印刷技术制备了功能材料厚膜，并在650℃下烧结2 h。所有样品的XRD分析显示形成了单相褶皱型四方结构，拉曼光谱和FTIR测试进一步证实了这一点。镧的掺入降低了烧结SnO2的晶粒尺寸，证实了镧作为晶粒生长抑制剂的作用。形态学研究揭示了可用于气体传感应用的多孔结构的形成。研究了液化石油气（LPG）、丙酮（CH3COCH3）、乙醇（C2H5OH）和氨（NH3）等还原性气体的气敏特性。当工作温度为300℃时，掺杂3mol % La的SnO2厚膜对酮蒸汽的响应最大，传感器的响应时间和恢复时间分别为20 s和48 s。(C) 2013 Elsevier Ltd and Techna Group S.r.l版权所有
Undoped and Lanthanum doped tin dioxide nanopowders were successfully synthesized by a chemical co-precipitation method. The TGA-DTA, XRD, TEM, SEM, EDAX, FTIR, Raman and UV-vis techniques were used to characterize various physico-chemical properties of samples. Thick films of functional material were prepared by using a screen printing technique and then sintered at 650 degrees C for 2 h. XRD analysis of all the samples revealed formation of single phase ruffle type tetragonal structures which was further supported by Raman studies and FTIR measurements. The particle size of sintered SnO2 was decreased with La doping, confirming the role of La as a grain growth inhibitor. Morphological studies revealed formation of porous structure useful for gas sensing application. Gas sensing characteristics were investigated towards various reducing gases such as liquefied petroleum gas (LPG), acetone (CH3COCH3), ethanol (C2H5OH) and ammonia (NH3). The maximum response was exhibited by 3 mol% La doped SnO2 thick film towards ketone vapor at an operating temperature of 300 degrees C. The sensor exhibited quick response and recovery times which were 20 s and 48 s, respectively. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.