纳米WO_3中空球的制备及其气敏性能研究  

Preparation and Gas Sensing Properties of the Nano-WO_3 Hollow Microsphere

作　　者：桂阳海[1,2] 东方红[3] 田俊峰[1] 赵建波[1] 

机构地区：[1]郑州轻工业学院材料与化学工程学院,郑州450002 [2]郑州轻工业学院功能材料研究所,郑州450002 [3]郑州工业安全职业学院,郑州451192

出　　处：《人工晶体学报》2013年第10期2099-2103,共5页Journal of Synthetic Crystals

基　　金：国家自然科学基金(21371158);河南省高等学校青年骨干教师资助计划项目;河南省科技厅基金项目(122300410299);郑州市科技攻关项目(121PPTGG362-3)

摘　　要：采用液相沉淀法在乙二醇/水混合体系中以钨酸钠、盐酸及水合肼为反应物制备了WO3纳米中空微球,通过XRD、FTIR、SEM等分析手段对产物的晶型结构、结构官能团和形貌进行了表征,探讨了WO3纳米中空球的形成机理,并对其气敏性能进行了研究。结果表明,制备的具有中空结构的纳米WO3为以单斜WO3和正交WO3为主的多晶相,晶粒度为25.93 nm,水合肼的添加为其中空结构的形成起到了重要作用,气敏性能研究表明,纳米WO3中空球对H2S具有很好的选择性,在工作电压为5.00V时,其灵敏度可达40.90。Liquid-phase precipitation method was employed to prepare the nano-WO3 hollow microspheres in ethylene glycol/water mixing solution using sodium tungstate, hydrochloric acid and hydrazine hydrate as reactants. The obtained powders were characterized by XRD, FTIR and SEM, respectively. The formation mechanism of the nano-WO3 hollow microsphere was also investigated as well as its gas-sensing properties. The results showed that the as-prepared nano-WO3 hollow structure belongs to the monoelinic WO3 and orthogonal WO3-based multi-crystal phases with the grain size of 25.93 nm. The addition of hydrazine hydrate plays a very important role in the formation of the hollow structure. The gas sensitivity performance studies have shown that nano-WO3 hollow mierosphere has good selectivity to H2S whose sensitivity is up to 40.90 at the working voltage of 5.00 V.

关 键 词：纳米WO3 中空球 气敏 机理 

分 类 号：O469[理学—凝聚态物理]