Low-power sensor node for the detection  of methane and propane

Bierer, Benedikt; Grgić, Dario; Yurchenko, Olena; Engel, Laura; Pernau, Hans‐Fridtjof; Jägle, Martin; Reindl, Leonhard M.; Wöllenstein, Jürgen

doi:10.5194/jsss-10-185-2021

Cited by 7 publications

(7 citation statements)

References 18 publications

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“…The proposed approach to coherent amplitude modulation sensing is a variation of various radio engineering, solid-state methods. Low-frequency noise, kilohertz, megahertz ranges are used; there are names of wave modulation, frequency modulation, and nanoparticle spectroscopy [5][6][7][8].…”

Section: Resultsmentioning

confidence: 99%

Coherent Amplitude Modulation in a Laser Gas Sensor

Zhanabaev

2023

Eurasian phys. tech. j.

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The article is devoted to a current topic in science and technology -determining the type and concentration of gas using a laser. At close values of green laser radiation intensity and bias voltage, interference patterns of the time series of the photodiode output signal were obtained. The degree of coherence (more than ~0.1) made it possible to distinguish between the types of gases and their concentrations. Signal coherence was controlled by Allan deviation values.The novelty of the research method is the choice of the harmonic of the electrical network asthe main modulation frequency. It is shown that the correlation functions and the corresponding power spectra are sensitive to low-frequency fluctuations of molecules and their clumps. This allows the results and methods of this work to be used in specific cases instead of large-sized and expensive complexes of optical instruments at room pressure and temperature.

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Section: Resultsmentioning

confidence: 99%

Coherent Amplitude Modulation in a Laser Gas Sensor

Zhanabaev

2023

Eurasian phys. tech. j.

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“…Here, we demonstrate DTA investigations on the impact of particle size and morphology of Co3O4 catalysts on their thermal response to CH4 oxidation and the thermal stability as well as the effect of H2S exposure. The pellistor response of Co3O4 related catalyst deposited on MEMS-based hotplate sensor [3] to CH4 and H2S is shown for comparison. The focus of the examinations was on lower operation temperatures (<400°C).…”

Section: Background Motivation and Objectivementioning

confidence: 99%

B5.3 Examination of New Catalysts for Catalytic Combustible Gas Sensors by Thermal Analysis

Yurchenko¹,

Pernau²,

Engel³

et al. 2021

SMSI 2021 - Sensors and Instrumentation

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DTA was used to investigate cobalt oxide (Co3O4) catalysts, which differ essentially in terms of particle morphology, to their thermal response towards methane (CH4) oxidation in dry air. Moreover, the thermal stability and the effect of hydrogen sulfide (H2S) inhibitor on the thermal behavior of the Co3O4 catalyst was examined by DTA. A comparison of the DTA measurement with a MEMS pellistor based on a modified Co3O4 catalyst shows a similar behaviour of their responses to CH4 and H2S. The obtained results demonstrate the reliability of the method for preselection of catalysts for their application in catalytic gas sensors.

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“…Details concerning the DSC method and the procedure adapted for catalysts examinations can be found in our recent publication [ 34 ]. Previous investigations on one of the examined catalysts (NiCo 2 O 4 ) confirmed that DSC measurements can be used to check the catalytic activity of potential catalysts for pellistors [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

Co3O4-Based Materials as Potential Catalysts for Methane Detection in Catalytic Gas Sensors

Yurchenko,

Diehle,

Altmann

et al. 2024

Sensors

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The present work deals with the development of Co3O4-based catalysts for potential application in catalytic gas sensors for methane (CH4) detection. Among the transition-metal oxide catalysts, Co3O4 exhibits the highest activity in catalytic combustion. Doping Co3O4 with another metal can further improve its catalytic performance. Despite their promising properties, Co3O4 materials have rarely been tested for use in catalytic gas sensors. In our study, the influence of catalyst morphology and Ni doping on the catalytic activity and thermal stability of Co3O4-based catalysts was analyzed by differential calorimetry by measuring the thermal response to 1% CH4. The morphology of two Co3O4 catalysts and two NixCo3−xO4 with a Ni:Co molar ratio of 1:2 and 1:5 was studied using scanning transmission electron microscopy and energy dispersive X-ray analysis. The catalysts were synthesized by (co)precipitation with KOH solution. The investigations showed that Ni doping can improve the catalytic activity of Co3O4 catalysts. The thermal response of Ni-doped catalysts was increased by more than 20% at 400 °C and 450 °C compared to one of the studied Co3O4 oxides. However, the thermal response of the other Co3O4 was even higher than that of NixCo3−xO4 catalysts (8% at 400 °C). Furthermore, the modification of Co3O4 with Ni simultaneously brings stability problems at higher operating temperatures (≥400 °C) due to the observed inhomogeneous Ni distribution in the structure of NixCo3−xO4. In particular, the NixCo3−xO4 with high Ni content (Ni:Co ratio 1:2) showed apparent NiO separation and thus a strong decrease in thermal response of 8% after 24 h of heat treatment at 400 °C. The reaction of the Co3O4 catalysts remained quite stable. Therefore, controlling the structure and morphology of Co3O4 achieved more promising results, demonstrating its applicability as a catalyst for gas sensing.

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Low-power sensor node for the detection of methane and propane

Cited by 7 publications

References 18 publications

Coherent Amplitude Modulation in a Laser Gas Sensor

Coherent Amplitude Modulation in a Laser Gas Sensor

B5.3 Examination of New Catalysts for Catalytic Combustible Gas Sensors by Thermal Analysis

Co3O4-Based Materials as Potential Catalysts for Methane Detection in Catalytic Gas Sensors

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