A solid-state gas sensor array for monitoring NO storage catalytic converters

Study of the Sensing Mechanism Towards Carbon Monoxide of Platinum-Based Field Effect Sensors

“…In that case, a CO response should be obtained for the dense gate as well since CO would just as efficiently block oxygen dissociation but allow hydrogen to diffuse through the metal. Sensitivity towards CO of sensors with dense platinum gates were obtained by Andersson et al [10], however, the response was generally lower than for the porous sensors, and no response was observed at 100 C or at temperatures above 300 C. Further, it is difficult to explain the observed sensitivity to NO in [32] by removal of background hydrogen. The experiment was performed with an oxygen concentration of 4%, which should be more than sufficiently high to oxidize the background hydrogen in the feed.…”

“…Further studies of the sensitivity towards, e.g., CO, NO, NO and hydrocarbons [32] showed that the pronounced NO response was of the opposite sign compared to that of CO and the hydrocarbons, whereas for NO, no significant response could be observed. The measurements were performed in a background of 4% oxygen.…”

Planar, impedance-metric NOx-sensor with spinel-type SE for high temperature applications

“…To overcome these problems different design changes and sensor types have been suggested (e.g. multi chamber amperometric sensors) [2,3]. But the need for costefficient and simple sensor systems with high lifetime holds back their commercial use until today.…”

Detection of hydrocarbon species using silicon MOS field-effect transistors operated in a non-stationary temperature-pulse mode

“…Under such hightemperature conditions not only hydrogen but also much more stable hydrocarbon species can be detected. Most of this research was motivated by the interest of applying fieldeffect gas sensors to harsh environment applications such as exhaust gas and flue gas monitoring [14][15][16][17][18][19][20][21][22][23][24].…”