Chemical Analysis with Tin Oxide Gas Sensors: Choice of Additives, Method of Operation and Analysis of Numerical Signal

Frank, Kevin; Magapu, V.; Schindler, Vladimír; Kohler, Heinz; Keller, Hubert B.; Seifert, R.

doi:10.1166/sl.2008.527

Cited by 17 publications

(7 citation statements)

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“…In the work of Frank et al, it was shown that using sensor networks, based on tin dioxide with different additives (palladium oxide, cobalt oxide, copper oxide, etc. ), the realization of the selective analysis of hydrocarbons gas mixtures could be achieved [29]. Perhaps, the selectivity of CO and ammonia detection in gas mixtures could benefit from the strong distinction of the temperature dependence of sensitivity in the SnO2/PdOx-CO ( Figure 5) and SnO2/RuOy-NH3 systems ( Figure 6).…”

Section: Sensing Behavior To Co + Nh3 Gases Mixturesmentioning

confidence: 99%

“…Perhaps, the selectivity of CO and ammonia detection in gas mixtures could benefit from the strong distinction of the temperature dependence of sensitivity in the SnO2/PdOx-CO ( Figure 5) and SnO2/RuOy-NH3 systems ( Figure 6). The issue of sensor surface poisoning at low temperatures could be overcome by an appropriate modulation of the operating temperature, e.g., pulsed heating to desorb impurities or applying a temperature gradient to the sensing layers [4,29]. However, this is a matter for further research with these materials.…”

Section: Sensing Behavior To Co + Nh3 Gases Mixturesmentioning

confidence: 99%

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Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

2015

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This paper is aimed at selectivity investigation of gas sensors, based on chemically modified nanocrystalline tin dioxide in the detection of CO and ammonia mixtures in air. Sol-gel prepared tin dioxide was modified by palladium and ruthenium oxides clusters via an impregnation technique. Sensing behavior to CO, NH3 and their mixtures in air was studied by in situ resistance measurements. Using the appropriate match of operating temperatures, it was shown that the reducing gases mixed in a ppm-level with air could be discriminated by the noble metal oxide-modified SnO2. Introducing palladium oxide provided high CO-sensitivity at 25-50 °C . Tin dioxide modified by ruthenium oxide demonstrated increased sensor signals to ammonia at 150-200 °C , and selectivity to NH3 in presence of higher CO concentrations.

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Section: Sensing Behavior To Co + Nh3 Gases Mixturesmentioning

confidence: 99%

Section: Sensing Behavior To Co + Nh3 Gases Mixturesmentioning

confidence: 99%

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

2015

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“…2). A detailed description of the sensor fabrication process is given in Frank et al (2008) and Knoblauch et al (2015). It is operated in the flue gas at 450 • C, and the operating temperature is controlled by a resistive thin-film temperature sensor integrated at the upper side of the chip.…”

Section: Sensors Under Investigationmentioning

confidence: 99%

High-temperature CO / HC gas sensors to optimize firewood combustion in low-power fireplaces

Ojha

Illyaskutty

Knoblauch

et al. 2017

J. Sens. Sens. Syst.

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Abstract. In order to optimize firewood combustion in low-power firewood-fuelled fireplaces, a novel combustion airstream control concept based on the signals of in situ sensors for combustion temperature, residual oxygen concentration and residual un-combusted or partly combusted pyrolysis gas components (CO and HC) has been introduced. A comparison of firing experiments with hand-driven and automated airstream-controlled furnaces of the same type showed that the average CO emissions in the high-temperature phase of the batch combustion can be reduced by about 80 % with the new control concept. Further, the performance of different types of high-temperature CO / HC sensors (mixed-potential and metal oxide types), with reference to simultaneous exhaust gas analysis by a high-temperature FTIR analysis system, was investigated over 20 batch firing experiments ( ∼ 80 h). The distinctive sensing behaviour with respect to the characteristically varying flue gas composition over a batch firing process is discussed. The calculation of the Pearson correlation coefficients reveals that mixed-potential sensor signals correlate more with CO and CH 4 ; however, different metal oxide sensitive layers correlate with different gas species: 1 % Pt / SnO 2 designates the presence of CO and 2 % ZnO / SnO 2 designates the presence of hydrocarbons. In the case of a TGS823 sensor element, there was no specific correlation with one of the flue gas components observed. The stability of the sensor signals was evaluated through repeated exposure to mixtures of CO, N 2 and synthetic air after certain numbers of firing experiments and exhibited diverse long-term signal instabilities.

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“…If the sensor temperature is varied periodically, e.g., triangularly over time, gas-specific fingerprints called conductance-over-time-profiles (CTP) are obtained. These allow (1) the study of the temperature-dependent gasspecific surface processes reflected in conductance changes and (2) the use of gas-specific CTP features for identification and analysis of single gas components and even gas mixtures by adequate numerical signal analysis [4,5]. Another way to increase the chemical analysis capability is to tailor the selectivity to specific gas components by admixing of additives as Pt or PdO [6], by doping with aliovalent ions, and to combine sensor elements with different gas-sensing properties in arrays to obtain a matrix of sensing data for chemical gas analysis by numerical procedures [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…These additives work as catalysts for the surface reaction [6] of the target gas with oxygen and take considerable influence on the sensor sensitivity. And, of course, by combination of suitable additive choice with the thermocyclic operation method, further success in chemical analysis performance is expected [9].…”

Section: Introductionmentioning

confidence: 99%

Gas-sensing studies on SnO2 or NASICON-type composite materials

Frank

Kohler

Guth

2008

Ionics

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NASICON Na 1þx Zr 2 Si x P xÀ3 O 12 ; 0 x 3 ð Þ powders were prepared by solid-state synthesis, a fraction was ion exchanged by Li or K, verified by X-ray diffraction and energy dispersive X-ray analysis, blended with tin oxide powder, transferred to thick film pastes, and dispensed on a commercial sensor substrate (Heraeus, Germany). Simultaneous gas sensitivity measurements on nine SnO 2 /NASICON-type (M 1þx Zr 2 Si x P xÀ3 O 12 , x=0, 2.2, 3, M = Li, Na, K) composites in thermocyclic sensor operation mode by exposure to different concentrations of Ethanol, Toluene, Propylene, CO, and H 2 in humidified synthetic air show a strong correlation of the gas-sensing properties with the mobile ion concentration and type of the solid electrolyte additive.

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Chemical Analysis with Tin Oxide Gas Sensors: Choice of Additives, Method of Operation and Analysis of Numerical Signal

Cited by 17 publications

References 0 publications

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

High-temperature CO / HC gas sensors to optimize firewood combustion in low-power fireplaces

Gas-sensing studies on SnO2 or NASICON-type composite materials

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Chemical Analysis with Tin Oxide Gas Sensors: Choice of Additives, Method of Operation and Analysis of Numerical Signal

Cited by 17 publications

References 0 publications

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

High-temperature CO / HC gas sensors to optimize firewood combustion in low-power fireplaces

Gas-sensing studies on SnO2 or NASICON-type composite materials

Contact Info

Product

Resources

About

High-temperature CO / HC gas sensors to optimize firewood combustion in low-power fireplaces