不同形貌纳米CoWO_4的水热法制备及气敏性能(英文)  

Hydrothermal Synthesis and Gas-Sensing Property of Nano-CoWO_4 with Different Morphologies

作　　者：蒋东丽[1] 刘汉甫[1] 刘峰[2] 白先群[1] 顾生玖[1] 

机构地区：[1]桂林医学院药学院,桂林541004 [2]安徽工业大学化学与化工学院,马鞍山243002

出　　处：《无机化学学报》2014年第8期1969-1976,共8页Chinese Journal of Inorganic Chemistry

基　　金：广西青年科学基金(桂科青0991086);国家自然科学基金(NSFC61271156)资助项目

摘　　要：以Co(NO3)2·6H2O、Na2WO4·2H2O为主要原料,去离子水为溶剂,利用水热法在不同条件下制备了一系列的纳米CoWO4,用XRD、TEM和比表面分析仪对产品的物相、形貌和比表面积进行了表征。较系统地探讨了水热条件(反应混合物pH值、反应时间、反应温度等)对产物物相和形貌的影响,并研究了不同形貌产品对甲醛、乙醇、氨气、苯和丙酮等的敏感性能。结果表明:水热条件对产品的物相和形貌有影响,在不同水热条件下,可成功制备CoWO4纳米颗粒、纳米立方体及纳米棒;以纳米颗粒、纳米立方体及纳米棒样品制成的气敏元件对被试气体有不同程度的响应,其中以纳米颗粒为基的元件在210℃对1 000μL·L-1NH3灵敏度为3.3。CoWO4 nanoparticles, nanocubes and nanorods were prepared by a facile hydrothermal process with Co （NO3）2· 6H2O, Na2WO4·2H2O as the main raw materials and distilled water as the solvent.The phase composition, the morphology and the specific surface area of the products were characterized by XRD, TEM and N2 absorptiondesorption. The influence of pH value, reaction temperature and reaction time on the morphology of the products was discussed in detail. The gas-sensing responses of CoWO4 nanomaterials to HCHO, C2H5OH, NH3, C6H6 and CHaCOCH3 were investigated. The results demonstrate that pH value, reaction temperature and reaction time of hydrothermal process play a key role in the formation of different morphologies. The gas sensors based on the asprepared CoWO4 nanoparticles, nanocubes and nanorods samples exhibit responses to all the tested gases from 120 ℃ to 300 ℃. A noteworthy result is that the sensitivity of sensor based on the CoWO4 nanoparticles is 3.3 at 210℃ to 1 000 μL· L^-1 NH3.

关 键 词：CoWO4 水热法 纳米棒 纳米立方体 气敏性能 

分 类 号：TB34[一般工业技术—材料科学与工程]