纳米Al_2O_3对催化传感器稳定性的影响  

Study on the Stability of Catalytic Sensor with Al_2O_3 Nanostructure Carrier

作　　者：童敏明[1] 张闯[1] 戴新联[1] 蔡丽[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,江苏徐州221008

出　　处：《传感技术学报》2007年第11期2369-2372,共4页Chinese Journal of Sensors and Actuators

基　　金：江苏省自然科学基金项目资助"纳米载体和催化剂对催化传感器影响机理的研究"(BK2005017);国家自然基金重点项目资助"煤矿瓦斯传感技术和预警系统基础理论与关键技术研究"(50534050)

摘　　要：采用碳热还原法制备催化传感器的载体Al2O3,呈纳米带的结构,使催化传感器灵敏度的稳定性得到明显的提高.分析其原因主要有两点,第一是制备的Al2O3具有材料一致性好,载体的孔径适中,粒度分布合理,比表面适当等特点,使催化剂Pt和Pb在载体表面的分布均匀;第二是纳米结构的Al2O3载体密实性好,强度高,抗烧结能力强,表面积稳定.催化传感器在长时间工作中灵敏度衰减的主要原因是载体表面积在高温条件下的变化和催化剂在载体表面的迁移,纳米结构的Al2O3较好地阻止了这种现象的发生,因此提高了催化传感器灵敏度的稳定性.The stability of catalytic sensor's output could be improved by nanocrystal Al2O3 carrier,which was prepared by carbothermic method.There are two main reasons for the improvement: first,the consistency of nanocrystal Al2O3 could offer a sensor's carrier with moderate aperture,appropriate distributing of granularity and proper specific surface,so the distributing of the catalyst Pt and Pb on carrier surface became more proportal;second,nanocrystal Al2O3 could offer a anti-sintering carrier with high density and intensity,so that the change of surface area was slow.The attenuation of sensitivity of catalytic sensor after a long-term working is as a result of the change of carrier surface area at high working temperature and the transfer of catalyst on the surface of carrier.Nanocrystal Al2O3 improved the stability of catalytic sensor by preventing the change of carrier surface area and the transfer of catalyst.

关 键 词：传感器 稳定性 纳米材料 AL2O3 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置]