The effect of SO2 on the sensitive layer of a NOx dosimeter

Groß, Andrea; Hanft, Dominik; Beulertz, Gregor; Marr, Isabella; Kubinski, David J.; Visser, J.H.; Moos, Ralf

doi:10.1016/j.snb.2012.10.039

Cited by 14 publications

(13 citation statements)

References 32 publications

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“…For instance, the dosimeter-type NO x sensing properties of a carbonate-based sensitive layer were found to be affected by SO 2 in two ways: the competition between SO 2 and NO x for the sorption sites lowers the NO x sensitivity as well as the measurement range. Furthermore, the conductivity is irreversibly affected by sulfate formation, enabling SO 2 dosimetry (Groß et al, 2012d).…”

Section: Influencing Factorsmentioning

confidence: 99%

“…The irreversible interaction of SO 2 with the NO x storage catalyst material causes a crosssensitivity of the NO x dosimeter but enables SO 2 dosimetry (Groß et al, 2012d). Zeolites, being a common class of materials in SCR catalysis due to their NH 3 storage capability, are also viable materials as sensitive layers working in the accumulation mode.…”

Section: Suitable Materials For Accumulating Gas Sensorsmentioning

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: Influencing Factorsmentioning

confidence: 99%

Section: Suitable Materials For Accumulating Gas Sensorsmentioning

confidence: 99%

Overview on conductometric solid-state gas dosimeters

Marr

Groß²,

Moos

2014

J. Sens. Sens. Syst.

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“…However, one drawback of the ultrathin PtNWs sensor is that its response to H 2 appeared to be irreversible at the ambient conditions. While such PtNW chemiresistor device can be operated and used as a highly sensitive and selective dosimeter‐type H 2 sensor (Figure f,g; Figure S5, Supporting Information), the irreversible response limits the application range of this sensing material, and is different from other reported H 2 sensors from Pt.…”

Section: Sensing Performance Of Different 1d Sensing Materialsmentioning

confidence: 95%

Highly Sensitive Chemical Detection with Tunable Sensitivity and Selectivity from Ultrathin Platinum Nanowires

Ding

Liu

Wang

et al. 2016

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Ultrathin platinum nanowires obtained from wet-synthesis with no strong binding ligands exhibit very high sensitivity toward hydrogen gas (two orders of magnitude increase compared with state-of-the-art devices). Their chemical sensitivity, selectivity, and other sensing characteristics can be rationally tailored through further surface engineering. A significantly reduced cross-sensitivity toward humidity is achieved, while the hydrogen sensitivity is preserved or even enhanced.

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“…Marr et al used high temperature of about 650 °C for a fast thermal regeneration of a dosimeter based on lanthanum stabilized γ-Al 2 O 3 impregnated with potassium and manganese oxides [54]. Chemical regenerations are also possible [55], e.g., net-reducing atmospheres. For a room-temperature dosimeter, without any additional heating, another regeneration strategy is necessary to desorb the previously sorbed molecules.…”

Section: Pre-considerationsmentioning

confidence: 99%

Novel Operation Strategy to Obtain a Fast Gas Sensor for Continuous ppb-Level NO2 Detection at Room Temperature Using ZnO—A Concept Study with Experimental Proof

Wagner

Schönauer-Kamin

Moos

2019

Sensors

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A novel sensor operation concept for detecting ppb-level NO2 concentrations at room temperature is introduced. Today’s research efforts are directed to make the sensors as fast as possible (low response and recovery times). Nevertheless, hourly mean values can hardly be precisely calculated, as the sensors are still too slow and show baseline drifts. Therefore, the integration error becomes too large. The suggested concept follows exactly the opposite path. The sensors should be made as slow as possible and operated as resistive gas dosimeters. The adsorption/desorption equilibrium should be completely shifted to the adsorption side during a sorption phase. The gas-sensitive material adsorbs each NO2 molecule (dose) impinging and the sensor signal increases linearly with the NO2 dose. The actual concentration value results from the time derivative, which makes the response very fast. When the NO2 adsorption capacity of the sensor material is exhausted, it is regenerated with ultraviolet (UV) light and the baseline is reached again. Since the baseline is newly redefined after each regeneration step, no baseline drift occurs. Because each NO2 molecule that reaches the sensor material contributes to the sensor signal, a high sensitivity results. The sensor behavior of ZnO known so far indicates that ZnO may be suitable to be applied as a room-temperature chemiresistive NO2 dosimeter. Because UV enhances desorption of sorbed gas species from the ZnO surface, regeneration by UV light should be feasible. An experimental proof demonstrating that the sensor concept works at room temperature for ppb-level NO2 concentrations and low doses is given.

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The effect of SO2 on the sensitive layer of a NOx dosimeter

Cited by 14 publications

References 32 publications

Overview on conductometric solid-state gas dosimeters

Overview on conductometric solid-state gas dosimeters

Highly Sensitive Chemical Detection with Tunable Sensitivity and Selectivity from Ultrathin Platinum Nanowires

Novel Operation Strategy to Obtain a Fast Gas Sensor for Continuous ppb-Level NO2 Detection at Room Temperature Using ZnO—A Concept Study with Experimental Proof

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