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采用乙醇/乙二醇混合溶剂热方法,通过添加不同含量乙二醇成功合成了不同形貌的WO3微/纳米结构材料。并采用FESEM、XRD、气敏测试装置,分别对产物形貌、结构和性能进行表征。FESEM结果显示,随着乙二醇含量的增加,产物微结构由纳米片逐渐演变成纳米针,最后变成纳米线,且在乙二醇含量为20%时的纳米针为核/壳结构。XRD分析表明烧结前不同形貌的产物分属不同结构的水合氧化钨,550℃热处理后同属于单斜晶系WO3。气敏性能测试表明对于还原性气体,纳米针形貌产物敏感度最大,纳米片最小,而对于氧化性气体NO2,结果正好相反。
WO3 micro / nanostructured materials with different morphologies were synthesized successfully by adding different content of ethylene glycol using alcohol / ethylene glycol mixed solvent thermal method. The morphology, structure and properties of the product were characterized by FESEM, XRD and gas-sensing test equipment respectively. FESEM results showed that with the increase of ethylene glycol content, the microstructure of the product gradually evolved from nanosheet to nanometer needle and finally became nanowires, and the nanorods were in a core / shell structure with ethylene glycol content of 20%. XRD analysis showed that the products with different morphologies before sintering belonged to hydrated tungsten oxide with different structures, and belong to monoclinic WO3 after heat treatment at 550 ℃. Gas sensitivities tests showed that the sensitivities of nano-needle-shaped products were the highest and that of nano-sheets was the smallest for reducing gases, while the opposite was true for NO2, an oxidizing gas.