纳米SnO_2基气敏元件对甲醛气体的检测(英文)  

Nano SnO_2 Based Gas Sensor for Formaldehyde Gas Detection

作　　者：曾文[1] 刘天模[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400030

出　　处：《纳米技术与精密工程》2009年第5期387-391,共5页Nanotechnology and Precision Engineering

基　　金：重庆大学研究生创新基金资助项目(200809Y1B0019);国家留学基金管理委员会国家公派研究生项目(留金出20093012)

摘　　要：采用溶胶-凝胶法制备了纳米SnO2粉末,利用X射线衍射仪(XRD)以及原子力显微镜(AFM)对材料的晶体结构及晶粒尺寸进行了表征.采用制备的纳米SnO2作为基底材料,掺杂纳米TiO2粉末(SnO2与TiO2的物质的量之比为9∶1)以及少量的Ag+(物质的量百分比为0.2%~0.4%),以此材料制成气敏元件,检测了元件的甲醛气敏性能.结果表明:该元件在工作温度为300℃时,对200×10-6的甲醛具有较好的敏感性,在不同的工作温度下,元件表现出良好的气敏选择性.理论计算表明,气体分子轨道能量的差异是元件气敏选择性的定性因素.Nano SnO2 powder was prepared with sol-gel method.The crystallite size and structure of this material were characterized with X-ray diffraction(XRD) and atomic force microscope(AFM).The gas sensors were made from mixed solid powder which contained nano SnO2 base doped with nano TiO2 powder(molar ratio of SnO2 to TiO2 of 9 ∶ 1)and Ag+(content of Ag+ of about 0.2%—0.4% according to the molar ratio).The formaldehyde gas sensing properties of this mixed solid powder were characterized with gas sensing measurement.Test results show that SnO2 based gas sensors exhibit good sensitivity to 200×10-6 formaldehyde gas at operating temperature of 300 ℃ and good gas sensing selectivity to formaldehyde at different operating temperatures.The result of theoretical calculation shows that difference in orbital energy of gas molecular is a qualitative factor for gas sensing selectivity at different operating temperatures.

关 键 词：SNO2 甲醛 气敏元件 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]