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Synthesis and Sensing Properties to NH_3 of Hexagonal WO_3 Metastable Nanopowders

机译：六方WO_3亚稳纳米粉体的合成及对NH_3的传感性能

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摘要

WO_3 is an important kind of wide-bandgap semiconducting metal oxides, which has a very promising property in gas-detection behavior. It has several polymorphs with triclinic, monoclinic, orthorhombic structures being the stable forms of this oxide. However, by a method known as acid precipitation, new metastable open crystalline forms with hexagonal structure have been successfully synthesized. The nanopowders were characterized by SEM, TEM, and XRD, and their sensing response to reducing gases (NH_3) was measured and compared to monoclinic WO_3, showing a much better sensing property of the hexagonal WO_3.
机译：WO_3是一种重要的宽带隙半导体金属氧化物，在气体检测行为方面具有非常有前途的性质。它具有几种具有三斜晶，单斜晶，斜方晶结构的多晶型物，是该氧化物的稳定形式。然而，通过一种称为酸沉淀的方法，已经成功地合成了具有六边形结构的新的亚稳开放晶体形式。通过SEM，TEM和XRD对纳米粉进行了表征，并测量了它们对还原气体（NH_3）的感测响应，并将其与单斜晶WO_3进行了比较，显示出六角形WO_3更好的感测特性。

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