Crystallinity and morphology-controlled synthesis of SnO₂ nanoparticles for higher gas sensitivity

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• 作者：Shimin Liu ; Li Li ; Weiwei Jiang ; Chaoqian Liu ; Wanyu Ding ; Weiping Chai
• 关键词：SnO2 nanoparticles ; Wet chemical method ; Crystallinity ; Morphology ; Gas sensitivity
• 刊名：Powder Technology
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：245
• 期：Complete
• 页码：168-173
• 全文大小：1043 K

文摘

SnO₂ nanoparticles with controlled crystallinity, morphology and gas sensitivity have been synthesized by four modified wet chemical processes using the same granular Sn but different solvents and preparation routes. The thermal decomposition, crystalline phase, morphology and gas sensitivity of precursors and well-crystallized SnO₂ nanoparticles were characterized by means of differential thermal analysis, X-ray diffraction, scanning electron microscopy, field emission transmission electron microscopy, energy dispersive X-ray spectroscopy and gas sensitivity measurement system. Results indicated that SnO₂ precursors showed quite different endothermic heat behavior, crystallinity and particle size, which were strongly depended on preparation processes. SnO₂ nanoparticles from different precursors showed the same typical tetragonal rutile SnO₂ structure but different particle size and morphology. The gas sensitivity of SnO₂ nanoparticles was investigated, which was strongly correlated with SnO₂ nanoparticles. At last, the formation mechanism including nucleation and growth of SnO₂ nanoparticles was proposed based on wet chemical reaction equations.