Resistive NOx dosimeter to detect very low NOx concentrations—Proof-of-principle and comparison with classical sensing devices

Marr, Isabella; Moos, Ralf

doi:10.1016/j.snb.2016.12.112

Cited by 17 publications

(14 citation statements)

References 17 publications

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“…Thus, another possibility is to operate the sensor in low-temperature ranges as an accumulative gas sensor, also called a gas dosimeter. More detailed information on gas dosimeters can be found in Marr and Moos (2017), Groß (2016), Marr (2016), and Groß et al (2013). In the context of this study, the sensor shall be operated as a classical concentration sensor.…”

Section: Introductionmentioning

confidence: 99%

“…Such selective resistive oxygen sensors should ideally only react to changes in oxygen concentration but not to changes in temperature. There are only a few materials that have a low or negligible temperature dependency, like Co 1−x Mg x O (Park and Logothetis, 1977), SrMg 0.4 Ti 0.6 O 3 (Yu et al, 1986), and SrTi 0.65 Fe 0.35 O 3−δ (STF35) (Menesklou et al, 1999;Moos et al, 2003). Of these materials, STF has therefore been very thoroughly investigated as a temperature-independent oxygen sensor material from different groups (Menesklou et al, 1999;Moos et al, 2011;Rothschild et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Multi-gas sensor to detect simultaneously nitrogen oxides and oxygen

Herrmann

Hagen

Kita

et al. 2020

J. Sens. Sens. Syst.

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Abstract. Due to tightened emission limits, the efficiency of exhaust gas aftertreatment systems has to be further enhanced. Therefore, inexpensive and robust NOx sensors are required to be installed not only in automotive exhausts, but also in any other kind of combustion-based application. In this contribution, an impedimetric NOx sensor is presented. The impedance of a functional thick film (KMnO4, manufactured in a screen-printing technique on planar alumina substrates) depends selectively on the NOx concentration in the exhaust but shows a dependency on the oxygen concentration. Therefore, an additional temperature-independent resistive oxygen sensor structure was integrated on the same sensor platform. BFAT (BaFe0.74Al0.01Ta0.25O3−δ (BaFe0.74Al0.01Ta0.25O3−δ) was used for this purpose, and the measurement was conducted in the dc resistance mode. It serves not only to determine the oxygen concentration in the exhaust, but also to correct the oxygen dependency of the NOx sensor.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-gas sensor to detect simultaneously nitrogen oxides and oxygen

Herrmann

Hagen

Kita

et al. 2020

J. Sens. Sens. Syst.

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“…For the regeneration process, i.e., for desorbing sorbed species, it is necessary to apply energy. 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.…”

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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“…This creates the demand for NO x gas sensors for the low ppm range that can also be operated in harsh environments like exhaust gases at high temperatures. Several types of NO x sensors were already discussed in the literature, based on potentiometric, impedancemetric, or amperometric working principles (see reviews [ 1 , 2 , 3 , 4 , 5 ]), as well as new approaches like mixed potential sensors [ 6 , 7 , 8 , 9 , 10 , 11 , 12 ], or solid state gas dosimeter to measure the time dependent accumulated NO x amount [ 13 , 14 ]. However, in the last ten years a novel technique called pulsed polarization method has been established.…”

Section: Introductionmentioning

confidence: 99%

Pulsed Polarization-Based NOx Sensors of YSZ Films Produced by the Aerosol Deposition Method and by Screen-Printing

Exner

Albrecht

Schönauer-Kamin

et al. 2017

Sensors

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The pulsed polarization technique on solid electrolytes is based on alternating potential pulses interrupted by self-discharge pauses. Since even small concentrations of nitrogen oxides (NOx) in the ppm range significantly change the polarization and discharge behavior, pulsed polarization sensors are well suited to measure low amounts of NOx. In contrast to all previous investigations, planar pulsed polarization sensors were built using an electrolyte thick film and platinum interdigital electrodes on alumina substrates. Two different sensor layouts were investigated, the first with buried Pt electrodes under the electrolyte and the second one with conventional overlying Pt electrodes. Electrolyte thick films were either formed by aerosol deposition or by screen-printing, therefore exhibiting a dense or porous microstructure, respectively. For screen-printed electrolytes, the influence of the electrolyte resistance on the NOx sensing ability was investigated as well. Sensors with buried electrodes showed little to no response even at higher NOx concentrations, in good agreement with the intended sensor mechanism. Electrolyte films with overlying electrodes, however, allowed the quantitative detection of NOx. In particular, aerosol deposited electrolytes exhibited high sensitivities with a sensor output signal ΔU of 50 mV and 75 mV for 3 ppm of NO and NO2, respectively. For screen-printed electrolytes, a clear trend indicated a decrease in sensitivity with increased electrolyte resistance.

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Resistive NOx dosimeter to detect very low NOx concentrations—Proof-of-principle and comparison with classical sensing devices

Cited by 17 publications

References 17 publications

Multi-gas sensor to detect simultaneously nitrogen oxides and oxygen

Multi-gas sensor to detect simultaneously nitrogen oxides and oxygen

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

Pulsed Polarization-Based NOx Sensors of YSZ Films Produced by the Aerosol Deposition Method and by Screen-Printing

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