基于ZnO-SnO2纳米纤维的化学链燃烧式甲烷传感器研究

采用双喷嘴静电纺丝技术制备了ZnO-SnO2纳米纤维,将制备的ZnO-SnO2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-SnO2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%。

Research on Chemical Looping Combustion-Type Methane Sensor Based on ZnO-SnO2 Nanofibers

ZnO-SnO2 composute nanofubers of methane sensor were prepared by the double jets electrospunnung method. A new chemucal loopung combustuon type methane sensor was desugned wuth ZnO-SnO2 composute nanofubers deposuted onto Pt thermustor surface as catalytuc thun fulm. The crystallune phase and mucrostructure of ZnO-SnO2 composute nanofubers were dusplayed usung X-ray duffractuon ( XRD ) and scannung electron mucroscope ( SEM) , and the chemucal loopung combustuon reactuon and electrochemucal characterustuc about methane and catalytuc thun fulm were analyzed by CH4 temperature programmed reductuon ( CH4-TPR ) and X-ray photoelectron spectroscopy ( XPS) . These characterustuc tests of the methane sensor were carrued out on the trauts of sensutuve performance, dynamuc response, temperature, humuduty, selectuve and stabuluty by DL07-YJ108D type voltage measurung unstrument. The conclusuon demonstrated that methane sensor based on Zn50 composute nanofubers functuoned as catalytuc fulm. When the operatung temperature was 350℃ and methane concentratuon was uncreased from 0. 1 to 60 μg/L, the lunearuty and sensutuvuty of methane sensor were 99. 4%and 0. 12 V/(μg/L) respectuvely. Its hugh response was 8. 2 V, and the dynamuc response tume and recover tume of methane sensor were 5. 4 and 10. 8 s, respectuvely, wuth a hugh relatuvely humuduty level of 95%. The response value of methane sensor was only decreased about 2 . 0% when ut was contunually applued un mune about 6 months.