MCM-41 modified SnO2 gas sensors: sensitivity and selectivity properties
MCM-41 modified SnO2 gas sensors: sensitivity and selectivity properties
复制标题
DOI：
10.1016/s0925-4005(99)00007-6
复制
发表时间：
1999-10
影响因子：
8.4
通讯作者：
Guangjin Li;S. Kawi
中科院分区：
文献类型：
--
作者：
Guangjin Li;S. Kawi
将SnO2与MCM-41（一种新型的高表面积介孔材料）机械混合，在700℃的空气中进行热处理，制备了改性SnO2（SnO2/MCM-41）气体传感器。选择H2、CO和ch4作为探测气体，对传感器的传感性能进行表征。与纯SnO2传感器相比，SnO2/MCM-41传感器对H2具有更高的灵敏度和选择性。结果表明，SnO2/MCM-41含量=0.7（重量比）的SnO2/MCM-41传感器对h2o2的灵敏度最高。在更高的温度范围内，SnO2/MCM-41传感器对CO和ch4的灵敏度也得到了提高。考察了sno2含量对CO和ch4的灵敏度和选择性的影响。简要讨论了SnO2/MCM-41气体传感器对h2o2的灵敏度和选择性提高的机理。
MCM-41 modified SnO2(SnO2/MCM-41) gas sensors were prepared by mechanically mixing SnO2with MCM-41 (which is a novel high-surface-area mesoporous material) followed with thermal treatment in air at 700°C. H2, CO and CH4were selected as probing gases to characterize the sensing properties of these sensors. Compared with those of the pure SnO2sensor, SnO2/MCM-41 sensors showed enhanced sensitivities and selectivity to H2. It was found that the SnO2/MCM-41 sensor having SnO2content of SnO2/MCM-41=0.7 (weight ratio) possessed the highest H2sensitivity. The sensitivities to CO and CH4were also found to be improved on the SnO2/MCM-41 sensors at much higher temperature ranges. The effect of SnO2content on the sensitivity and selectivity to CO and CH4were also investigated. The mechanistic aspect due to the enhancement of the sensitivity and selectivity of SnO2/MCM-41 gas sensors to H2is briefly discussed.