混合溶剂协同效应对WO_3形貌及气敏性能的影响  

Influence of Mixed Solvent on the Morphology and Sensing Properties of WO_3 Products

作　　者：闫爱华[1] 谢长生[1,2] 田宽[1] 

机构地区：[1]华中科技大学塑性成型及模具技术国家重点实验室,武汉430074 [2]华中科技大学,材料学院纳米与智能传感实验室,武汉430074

出　　处：《功能材料与器件学报》2011年第4期417-421,共5页Journal of Functional Materials and Devices

基　　金：国家基础研究基金(2009CB939705和2009CB939702);国家自然科学基金仪器专项项目(50927201)

摘　　要：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/nano-materials with different morphologies were successfully synthesized by an ethanol/glycol solvothermal approach.The morphology,microstructure and sensing property were characterized by FESEM,XRD and self-made sensing mechanism.FESEM shows that the microstructure is gradually evolved form nanowall,nanoneedle to nanowire with the addition of glycol.The core/shell structure will be present when the content of glycol arrives at 20%.XRD indicates that the products with different morphologies belong to tungsten oxide hydrate before annealing.After heat-treated at 550℃,all the products are converted to monoclinic WO3.For sensing properties,the nanoneedle in reductive gas is the strongest and the nanosheet is the lowest.On the contrary,the nanoneedle in oxidizing gas is the weakest and the nanosheet is the strongest.

关 键 词：WO3 溶剂热反应 形貌 气敏性能 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]