Integrating nitrogen oxide sensor: A novel concept for measuring low concentrations in the exhaust gas

Geupel, Andrea; Schönauer, Daniela; Röder-Roith, Ulla; Kubinski, David J.; Mulla, Shadab; Ballinger, Todd H.; Chen, Hai-Ying; Visser, J.H.; Moos, Ralf

doi:10.1016/j.snb.2010.01.036

Cited by 51 publications

(44 citation statements)

References 25 publications

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“…The irreversible, selective, and progressive analyte sorption resulting in analyte accumulation can be caused by strong analyte sorption or a chemical reaction between the analyte and the receptor. Hence, gas dosimeters working in the accumulation mode (Yamazoe and Shimanoe, 2007) are often also denoted as "integrating" or "accumulating" sensors (Tanaka et al, 1999;Maruo 2007;Geupel et al, 2010;Groß et al, 2012b). For the explanation of the accumulating sensing principle, a planar setup consisting of an insulating support with electrodes, e.g., interdigitated electrodes, covered with a sensitive layer, was chosen.…”

Section: Basic Working Principle Of a Solid-state Gas Dosimetermentioning

confidence: 99%

“…In the literature, this change in the accumulationlevel is detected mainly optically (Tanaka et al, 1999;Sasaki et al, 2001;Maruo, 2007) or gravimetrically (Matsuguchi et al, 2005). Recently impedimetric approaches have emerged (Varghese et al, 2001;Mattoli et al, 2007;Helwig et al, 2008;Geupel et al, 2010;Hennemann et al, 2012a;Groß et al, 2012c). Regeneration has to be initiated if saturation effects limit the sorption rate of the sensitive layer or if the sensing characteristic is deteriorated.…”

Section: Direct Amount and Indirect Concentration Detectionmentioning

confidence: 99%

“…Concerning the observed saturation of gas dosimeters, e.g., in Geupel et al (2010), it needs to be distinguished whether those effects originate from the limited number of sorption sites in the analyte sensitive material or from a nonlinear correlation between the sensor response and the analyte loading level.…”

Section: Direct Amount and Indirect Concentration Detectionmentioning

confidence: 99%

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Overview on conductometric solid-state gas dosimeters

Marr

Groß²,

Moos

2014

J. Sens. Sens. Syst.

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Abstract. The aim of this article is to introduce the operation principles of conductometric solid-state dosimeter-type gas sensors, which have found increased attention in the past few years, and to give a literature overview on promising materials for this purpose. Contrary to common gas sensors, gas dosimeters are suitable for directly detecting the dose (also called amount or cumulated or integrated exposure of analyte gases) rather than the actual analyte concentration. Therefore, gas dosimeters are especially suited for low level applications with the main interest on mean values. The applied materials are able to change their electrical properties by selective accumulation of analyte molecules in the sensitive layer. The accumulating or dosimeter-type sensing principle is a promising method for reliable, fast, and long-term detection of low analyte levels. In contrast to common gas sensors, few devices relying on the accumulation principle are described in the literature. Most of the dosimeter-type devices are optical, mass sensitive (quartz microbalance/QMB, surface acoustic wave/SAW), or field-effect transistors. The prevalent focus of this article is, however, on solid-state gas dosimeters that allow a direct readout by measuring the conductance or the impedance, which are both based on materials that change (selectively in ideal materials) their conductivity or dielectric properties with gas loading. This overview also includes different operation modes for the accumulative sensing principle and its unique features.

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Section: Basic Working Principle Of a Solid-state Gas Dosimetermentioning

confidence: 99%

Section: Direct Amount and Indirect Concentration Detectionmentioning

confidence: 99%

Section: Direct Amount and Indirect Concentration Detectionmentioning

confidence: 99%

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Overview on conductometric solid-state gas dosimeters

Marr

Groß²,

Moos

2014

J. Sens. Sens. Syst.

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“…Recently, dosimeter-type resistive gas sensors are suggested for gas concentration measurements (Geupel et al, 2010;Groß et al, 2012). Both soot sensor and dosimeter-type resistive gas sensor rely on the same principle: with sorption of gas (or soot) the resistance changes and as soon as saturation effects occur, sensor regeneration is required, typically induced by heating the sensitive film far above working temperature.…”

Section: Discussionmentioning

confidence: 99%

Improvement of the sensitivity of a conductometric soot sensor by adding a conductive cover layer

Bartscherer

Moos

2013

J. Sens. Sens. Syst.

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Abstract. Diesel particulate filters are emission-relevant devices of the exhaust gas aftertreatment system. They need to be monitored as a requirement of the on-board diagnosis. In order to detect a malfunction, planar sensors with interdigital electrodes on an insulating substrate can be installed downstream of the filter. During the loading phase, soot deposits onto the electrodes, but the sensor remains blind until the percolation threshold has been reached (initiation time) and the sensor current starts to flow. In order to detect small soot concentrations downstream of the filter from small defects, this initiation time needs to be as low as possible. One may reduce the initiation time by covering the interdigital electrodes with an electrically conductive layer. Using finite element method (FEM) simulations, the influence of conductivity and thickness of such a coating on the initiation time are determined. It is found that a thin, screen printable coating with a thickness of 20 µm and a conductivity in the range of 10 −3 to 10 −1 S m −1 may reduce the initiation time by about 40 %. The FEM results were verified by a commercially available thick film resistor paste with a conductivity of 0.45 mS m −1 , showing an improvement of about 40 % compared to an uncoated sensor.

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“…Reliable and long-term stable sensing devices for the lowest NOx concentrations are necessary to meet the strict requirements of, for instance, the European legislation, with regard to quality of the data especially in real-time air quality monitoring [2]. In literature, various NOx gas sensing technologies are discussed [1,[3][4][5]. The sensors have to be accurate, selective, long-term stable, and should have low NOx detection limits.…”

Section: Introductionmentioning

confidence: 99%

2D SnS2—A Material for Impedance-Based Low Temperature NOx Sensing?

Schönauer-Kamin

Włodarski

et al. 2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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Abstract:The sensor signal of tin disulfide (SnS2), a two-dimensional (2D) group-IV dichalcogenide, deposited as a film on a conductometric transducer is investigated at 130 °C. The focus is on the detection of the total NOx concentration. Therefore, the sensor response to NO and NO2 at ppm-and sub-ppm level at low operating temperature is determined. The results show that the sensing device provides a high sensor signal to NO and NO2 even at concentrations of only 390 ppb NOx. Both nitrous components, NO and NO2, yield the same signal, which offers the opportunity to sense the total concentration of NOx.

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Integrating nitrogen oxide sensor: A novel concept for measuring low concentrations in the exhaust gas

Cited by 51 publications

References 25 publications

Overview on conductometric solid-state gas dosimeters

Overview on conductometric solid-state gas dosimeters

Improvement of the sensitivity of a conductometric soot sensor by adding a conductive cover layer

2D SnS2—A Material for Impedance-Based Low Temperature NOx Sensing?

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