Integrating nitrogen oxide sensor: A novel concept for measuring low concentrations in the exhaust gas
Integrating nitrogen oxide sensor: A novel concept for measuring low concentrations in the exhaust gas
复制标题
DOI：
10.1016/j.snb.2010.01.036
复制
发表时间：
2010-03-19
影响因子：
8.4
通讯作者：
Moos, R.
中科院分区：
文献类型：
--
作者：
Geupel, A.;Schoenauer, D.;Moos, R.
为了满足未来的排放法规，将需要在低ppm检测范围内具有高灵敏度的氮氧化物（NOx）传感器。为此目的，提出了一种集成NOx传感器的概念。在该概念中，应用在叉指电极结构上的公知的贫NOx捕集器（LNT）材料用于在NOx后处理系统的下游积聚非常低的NOx浓度。当在350 ° C下操作时，阻抗随着NO储存的增加而降低。我们证明，这样的传感器的电阻抗是一个很好的措施存储NO的量（验证传感器设备的集成特性和它的能力，以检测非常低的NO量）。此外，进行了关于对氧气和二氧化碳的交叉灵敏度的第一传感器测试。所提供的数据表明，在很宽的范围内，氧气和二氧化碳的浓度没有显著的影响，但氧气的存在是必不可少的。(C)2010 Elsevier B.V.保留所有权利。
In order to meet the future emissions regulations, nitrogen oxides (NOx) sensors with a high sensitivity in the low ppm detection range will be required. An integrating NOx sensor concept is proposed for that purpose. In this concept, well-known lean NOx trap (LNT) materials applied on an interdigitated electrode structure are used to accumulate the very low NOx-concentrations downstream of the NOx aftertreatment systems. When operated at 350 degrees C, the impedance decreased with increased NO storage. We demonstrate that the electrical impedance of such a sensor is a good measure for the amount of stored NO (verifying the integrating properties of the sensor device and its ability to detect very low amounts of NO). Moreover, first sensor tests concerning the cross sensitivity to oxygen and carbon dioxide were conducted. The data presented show that there is no significant influence of the concentration of oxygen and carbon dioxide in a wide range, but it is essential that oxygen is present at all. (C) 2010 Elsevier B.V. All rights reserved.