共查询到11条相似文献,搜索用时 78 毫秒
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本文报道了一种SnO2气敏传感器感机理的新模型。SnO2晶粒表面势垒由3个过程控制:(1)氧吸附(作电子受主)和脱附,(2)还原性气体附(作电子施主)和脱附,(3)表面氧化还原反应。据此可以很好地解释实验中发现的氧化压对气敏传感器响应的影响。 相似文献
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本文对TiO2陶瓷晶界层电容器进行了较为系统的研究。用液相喷雾干燥法制备含Nb5+,Ba2+微量杂质的TiO2超细原料粉末,研究了TiO2陶瓷的电性能与烧结温度和测试条件的关系,阐述了TiO2晶界层电容器的形成机制。 相似文献
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通过水热法制备了纳米球状MoSe2结构。使用扫描电子显微镜(SEM)对该材料的结构和形貌进行了表征。MoSe2纳米球状结构形貌均匀,其直径为200~300 nm。同时,利用叉指电极制作了基于MoSe2的气体传感器,并测试了其气敏性能。测试结果显示:在室温条件下,MoSe2传感器具有优异的气敏性能,能检测到极低体积分数的NO2,对体积分数6×10-8的NO2的响应为1.006 4,在空气中也能完全恢复。此外,该传感器还具有良好的响应/恢复特性、重复性、长期稳定性与选择性。最后结合电子转移理论,分析了MoSe2气体传感器对NO2气体的气敏机理。 相似文献
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The working mechanism of sensors plays an important role in their simulation and design, which is the foundation of their applications. A model of a nanotube NO2 gas sensor system is established based on an (8, 0) silicon carbide nanotube (SiCNT) with a NO2 molecule adsorbed. The transport properties of the system are studied with a method combining density functional theory (DFT) with the non-equilibrium Green's function (NEGF). The adsorbed gas molecule plays an important role in the transport properties of the gas sensor, which results in the formation of a transmission peak near the Fermi energy. More importantly, the adsorption leads to different voltage current characteristics of the sensor to that with no adsorption; the difference is large enough to detect the presence of NO2 gas. 相似文献
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