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首页> 外文期刊>Science of advanced materials >Synthesis of Nano-Sized Tungsten Oxide (WO3) Powder by a Polymer Solution Route
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Synthesis of Nano-Sized Tungsten Oxide (WO3) Powder by a Polymer Solution Route

机译：高分子溶液法合成纳米氧化钨（WO3）粉

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摘要

On the basis of its distinct electronic properties tungsten oxide (WO3) is suitable for various applications ranging from use as a photocatalyst to application as a gas sensor. In particular, nano-sized tungsten oxide powder shows excellent sensitivity as a NOx gas sensor. However, nano-sized tungsten oxide powder has not yet been commercialized. In this study, the fabrication process for obtaining nano particles of WO3 is examined. The materials used were tungsten salt, polyvinyl alcohol (PVA), and nitric acid (HNO3). Dissolving the salt in deionized water with a 5 wt% PVA solution ensured that the tungsten particles dispersed homogeneously. After calcination at relatively low temperature, the organic materials were completely burned out and nano-sized WO3 powders were obtained. A SEM analysis of the samples showed either plates or spheres of tungsten nano particles. Furthermore, the particles were partially agglomerated. The particle morphology and agglomeration were influenced by the PVA content and nitric acid treatment. SEM images show synthesized WO3 nano particles of 50 nm size with soft agglomeration. The measured surface area of the synthesized powders fell in a wide range from 10.5 similar to 21.5 m(2)/g.
机译：基于其独特的电子性能，氧化钨（WO3）适用于各种应用，从用作光催化剂到用作气体传感器。尤其是，纳米级氧化钨粉末作为NOx气体传感器显示出优异的灵敏度。然而，纳米级氧化钨粉末尚未商业化。在这项研究中，研究了获得WO3纳米颗粒的制造工艺。使用的材料是钨盐，聚乙烯醇（PVA）和硝酸（HNO3）。用5 wt％PVA溶液将盐溶解在去离子水中，可确保钨颗粒均匀分散。在相对较低的温度下煅烧后，有机材料被完全烧尽，获得了纳米级WO3粉末。样品的SEM分析显示钨纳米颗粒的平板或球体。此外，颗粒被部分团聚。 PVA含量和硝酸处理影响了颗粒的形貌和团聚。 SEM图像显示具有软团聚的50nm尺寸的合成WO 3纳米颗粒。合成粉末的测量表面积在从10.5到21.5 m（2）/ g的较大范围内下降。

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