基于ZnO-SnO_2纳米纤维的化学链燃烧式甲烷传感器研究  

Research on Chemical Looping Combustion-Type Methane Sensor Based on ZnO-SnO_2 Nanofibers

作　　者：曹小荣[1] 胡明江[2] CAO Xiao-Rong HU Ming-Jiang(Department of Mechanical and Electrical Engineering, Henan Quality Engineering Vocational College, Pingdingshan 467000, China School of Energy and Building Environmental Engineering, Henan University of Urban Construction, Pingdingshan 467036, China)

机构地区：[1]河南质量工程职业学院机电工程系,平顶山467000 [2]河南城建学院能源与建筑环境工程学院,平顶山467036

出　　处：《分析化学》2016年第10期1555-1561,共7页Chinese Journal of Analytical Chemistry

基　　金：国家自然基金项目(No.51376083);河南省高等学校重点科研项目(No.15A470006)资助~~

摘　　要：采用双喷嘴静电纺丝技术制备了ZnO-SnO_2纳米纤维,将制备的ZnO-SnO_2纳米纤维均匀涂覆于铂热敏电阻表面形成催化薄膜,设计了一种新型化学链燃烧式甲烷传感器。采用X射线衍射仪、扫描电子显微镜、全自动程序化学吸附仪和X-射线光电子能谱仪,表征了ZnO-SnO_2纳米纤维的相组成和微观形貌,讨论了催化薄膜表面的电化学性能对甲烷化学链燃烧反应的影响。采用DL07-YJ108D型电压测量仪测试了甲烷传感器灵敏响应性、温湿特性、选择性和长期稳定性。结果表明,以Zn50纳米纤维为催化薄膜的甲烷传感器,在温度为350℃,甲烷浓度为0.1~60μg/L时,传感器线性度和灵敏度最大值分别为99.4%和0.12 V/（μg/L）,最大响应为8.2 V,动态响应和恢复时间分别为5.4和10.8 s,承受的最大相对湿度为95%。在矿井中连续使用6个月后,响应下降了2.0%。ZnO-SnO_2 composite nanofibers of methane sensor were prepared by the double jets electrospinning method. A new chemical looping combustion type methane sensor was designed with ZnO-SnO_2 composite nanofibers deposited onto Pt thermistor surface as catalytic thin film. The crystalline phase and microstructure of ZnO-SnO_2 composite nanofibers were displayed using X-ray diffraction（ XRD） and scanning electron microscope（ SEM）,and the chemical looping combustion reaction and electrochemical characteristic about methane and catalytic thin film were analyzed by CH_4 temperature programmed reduction（CH_4-TPR） and X-ray photoelectron spectroscopy（ XPS）. These characteristic tests of the methane sensor were carried out on the traits of sensitive performance,dynamic response,temperature,humidity,selective and stability by DL07-YJ108 D type voltage measuring instrument. The conclusion demonstrated that methane sensor based on Zn50 composite nanofibers functioned as catalytic film. When the operating temperature was 350℃ and methane concentration was increased from 0.1 to 60 μg / L,the linearity and sensitivity of methane sensor were 99.4%and 0.12 V /（ μg / L） respectively. Its high response was 8. 2 V,and the dynamic response time and recover time of methane sensor were 5.4 and 10.8 s,respectively,with a high relatively humidity level of 95%. The response value of methane sensor was only decreased about 2. 0% when it was continually applied in mine about 6 months.

关 键 词：静电纺丝 甲烷 传感器 化学链燃烧 纳米纤维 催化薄膜 

分 类 号：TQ340.64[化学工程—化纤工业] TP212[自动化与计算机技术—检测技术与自动化装置]