Thermo-cyclically operated metal oxide gas sensor arrays for analysis of dissolved volatile organic compounds in fermentation processes: Part I – Morphology aspects of the sensing behavior
For a comparative study of the gas sensing performance to dissolved volatile organic compounds (VOCs), the SnO2-powders have been prepared using two different fabrication routes; the flame-spray-pyrolysis (FSP) and the sol-gel (SG) route; and were admixed with the same additive-powders (alumina, YSZ...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-06-01
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| Series: | Sensing and Bio-Sensing Research |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214180423000107 |
| _version_ | 1827940567168843776 |
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| author | Binayak Ojha Margarita Aleksandrova Matthias Schwotzer Matthias Franzreb Heinz Kohler |
| author_facet | Binayak Ojha Margarita Aleksandrova Matthias Schwotzer Matthias Franzreb Heinz Kohler |
| author_sort | Binayak Ojha |
| collection | DOAJ |
| description | For a comparative study of the gas sensing performance to dissolved volatile organic compounds (VOCs), the SnO2-powders have been prepared using two different fabrication routes; the flame-spray-pyrolysis (FSP) and the sol-gel (SG) route; and were admixed with the same additive-powders (alumina, YSZ, and NASICON). The morphology of the two different SnO2/additive families were investigated by ESEM analysis and Energy-dispersive X-Ray Spectroscopy (EDS). Both SnO2/additive material families were separately deposited as thick-film-layers on two four-fold sensor-chips which were simultaneously thermo-cyclically operated in a measurement cell combined with a carrier gas probe, which enables sensing tests with evaporated VOCs (acetic acid, propionic acid, ethanol, acetone) dissolved in water. The resulting Conductance-over-Time-Profiles (CTPs) highlight better sensitivities of most of the FSP-layers to all the analytes compared to the SG-prepared layers. Furthermore, the CTP shapes of the FSP layers show clearly enhanced specificity representing the individual analyte components. This was interpreted to be the consequence of the extremely fine, scarcely agglomerated grain morphology of FSP-prepared powders and their very narrow grain size distribution which provide better conditions for enhanced gas specific surface reactions. Results promise a better chemical analysis capability of dissolved VOCs by numerical analysis of the CTP of FSP-prepared gas sensitive layers. |
| first_indexed | 2024-03-13T09:12:25Z |
| format | Article |
| id | doaj.art-a834edcb8cf94b45aa3917387ce46501 |
| institution | Directory Open Access Journal |
| issn | 2214-1804 |
| language | English |
| last_indexed | 2024-03-13T09:12:25Z |
| publishDate | 2023-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Sensing and Bio-Sensing Research |
| spelling | doaj.art-a834edcb8cf94b45aa3917387ce465012023-05-27T04:25:16ZengElsevierSensing and Bio-Sensing Research2214-18042023-06-0140100558Thermo-cyclically operated metal oxide gas sensor arrays for analysis of dissolved volatile organic compounds in fermentation processes: Part I – Morphology aspects of the sensing behaviorBinayak Ojha0Margarita Aleksandrova1Matthias Schwotzer2Matthias Franzreb3Heinz Kohler4Institute for Sensor and Information Systems (ISIS), Karlsruhe University of Applied Sciences, Moltkestr. 30, D-76133 Karlsruhe, Germany; Corresponding authors.Institute for Sensor and Information Systems (ISIS), Karlsruhe University of Applied Sciences, Moltkestr. 30, D-76133 Karlsruhe, GermanyInstitute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Karlsruhe, GermanyInstitute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Karlsruhe, GermanyInstitute for Sensor and Information Systems (ISIS), Karlsruhe University of Applied Sciences, Moltkestr. 30, D-76133 Karlsruhe, Germany; Corresponding authors.For a comparative study of the gas sensing performance to dissolved volatile organic compounds (VOCs), the SnO2-powders have been prepared using two different fabrication routes; the flame-spray-pyrolysis (FSP) and the sol-gel (SG) route; and were admixed with the same additive-powders (alumina, YSZ, and NASICON). The morphology of the two different SnO2/additive families were investigated by ESEM analysis and Energy-dispersive X-Ray Spectroscopy (EDS). Both SnO2/additive material families were separately deposited as thick-film-layers on two four-fold sensor-chips which were simultaneously thermo-cyclically operated in a measurement cell combined with a carrier gas probe, which enables sensing tests with evaporated VOCs (acetic acid, propionic acid, ethanol, acetone) dissolved in water. The resulting Conductance-over-Time-Profiles (CTPs) highlight better sensitivities of most of the FSP-layers to all the analytes compared to the SG-prepared layers. Furthermore, the CTP shapes of the FSP layers show clearly enhanced specificity representing the individual analyte components. This was interpreted to be the consequence of the extremely fine, scarcely agglomerated grain morphology of FSP-prepared powders and their very narrow grain size distribution which provide better conditions for enhanced gas specific surface reactions. Results promise a better chemical analysis capability of dissolved VOCs by numerical analysis of the CTP of FSP-prepared gas sensitive layers.http://www.sciencedirect.com/science/article/pii/S2214180423000107Metal oxideGas sensorThermo-cyclic operationFlame-spray pyrolysisVOC analysis |
| spellingShingle | Binayak Ojha Margarita Aleksandrova Matthias Schwotzer Matthias Franzreb Heinz Kohler Thermo-cyclically operated metal oxide gas sensor arrays for analysis of dissolved volatile organic compounds in fermentation processes: Part I – Morphology aspects of the sensing behavior Sensing and Bio-Sensing Research Metal oxide Gas sensor Thermo-cyclic operation Flame-spray pyrolysis VOC analysis |
| title | Thermo-cyclically operated metal oxide gas sensor arrays for analysis of dissolved volatile organic compounds in fermentation processes: Part I – Morphology aspects of the sensing behavior |
| title_full | Thermo-cyclically operated metal oxide gas sensor arrays for analysis of dissolved volatile organic compounds in fermentation processes: Part I – Morphology aspects of the sensing behavior |
| title_fullStr | Thermo-cyclically operated metal oxide gas sensor arrays for analysis of dissolved volatile organic compounds in fermentation processes: Part I – Morphology aspects of the sensing behavior |
| title_full_unstemmed | Thermo-cyclically operated metal oxide gas sensor arrays for analysis of dissolved volatile organic compounds in fermentation processes: Part I – Morphology aspects of the sensing behavior |
| title_short | Thermo-cyclically operated metal oxide gas sensor arrays for analysis of dissolved volatile organic compounds in fermentation processes: Part I – Morphology aspects of the sensing behavior |
| title_sort | thermo cyclically operated metal oxide gas sensor arrays for analysis of dissolved volatile organic compounds in fermentation processes part i morphology aspects of the sensing behavior |
| topic | Metal oxide Gas sensor Thermo-cyclic operation Flame-spray pyrolysis VOC analysis |
| url | http://www.sciencedirect.com/science/article/pii/S2214180423000107 |
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