Thin SnOx films for surface plasmon resonance enhanced ellipsometric gas sensing (SPREE)
Background: Gas sensors are very important in several fields like gas monitoring, safety and environmental applications. In this approach, a new gas sensing concept is investigated which combines the powerful adsorption probability of metal oxide conductive sensors (MOS) with an optical ellipsometri...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Beilstein-Institut
2017-02-01
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| Series: | Beilstein Journal of Nanotechnology |
| Subjects: | |
| Online Access: | https://doi.org/10.3762/bjnano.8.56 |
| _version_ | 1818863837881827328 |
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| author | Daniel Fischer Andreas Hertwig Uwe Beck Volkmar Lohse Detlef Negendank Martin Kormunda Norbert Esser |
| author_facet | Daniel Fischer Andreas Hertwig Uwe Beck Volkmar Lohse Detlef Negendank Martin Kormunda Norbert Esser |
| author_sort | Daniel Fischer |
| collection | DOAJ |
| description | Background: Gas sensors are very important in several fields like gas monitoring, safety and environmental applications. In this approach, a new gas sensing concept is investigated which combines the powerful adsorption probability of metal oxide conductive sensors (MOS) with an optical ellipsometric readout. This concept shows promising results to solve the problems of cross sensitivity of the MOS concept.Results: Undoped tin oxide (SnOx) and iron doped tin oxide (Fe:SnOx) thin add-on films were prepared by magnetron sputtering on the top of the actual surface plasmon resonance (SPR) sensing gold layer. The films were tested for their sensitivity to several gas species in the surface plasmon resonance enhanced (SPREE) gas measurement. It was found that the undoped tin oxide (SnOx) shows higher sensitivities to propane (C3H8) then to carbon monoxide (CO). By using Fe:SnOx, this relation is inverted. This behavior was explained by a change of the amount of binding sites for CO in the layer due to this iron doping. For hydrogen (H2) no such relation was found but the sensing ability was identical for both layer materials. This observation was related to a different sensing mechanism for H2 which is driven by the diffusion into the layer instead of adsorption on the surface.Conclusion: The gas sensing selectivity can be enhanced by tuning the properties of the thin film overcoating. A relation of the binding sites in the doped and undoped SnOx films and the gas sensing abilities for CO and C3H8 was found. This could open the path for optimized gas sensing devices with different coated SPREE sensors. |
| first_indexed | 2024-12-19T10:22:07Z |
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| id | doaj.art-b0cd5b69925b4978b33d90dbb48c9373 |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-12-19T10:22:07Z |
| publishDate | 2017-02-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-b0cd5b69925b4978b33d90dbb48c93732022-12-21T20:26:01ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862017-02-018152252910.3762/bjnano.8.562190-4286-8-56Thin SnOx films for surface plasmon resonance enhanced ellipsometric gas sensing (SPREE)Daniel Fischer0Andreas Hertwig1Uwe Beck2Volkmar Lohse3Detlef Negendank4Martin Kormunda5Norbert Esser6BAM, Division 6.7, Surface Modification and Measurement Technique, Unter den Eichen 44–46, 12203 Berlin, GermanyBAM, Division 6.7, Surface Modification and Measurement Technique, Unter den Eichen 44–46, 12203 Berlin, GermanyBAM, Division 6.7, Surface Modification and Measurement Technique, Unter den Eichen 44–46, 12203 Berlin, GermanyBAM, Division 2.1, Gases, Gasplants, Unter den Eichen 44–46, 12203 Berlin, GermanyBAM, Division 2.1, Gases, Gasplants, Unter den Eichen 44–46, 12203 Berlin, GermanyJ.E.Purkinje University, Faculty of Science, Department of Physics, Ceske mladeze 8, 400 96 Usti nad Labem, Czech RepublicLeibniz Institut für Analytische Wissenschaften ISAS e.V., Schwarzschildstr. 12, 12489 Berlin, GermanyBackground: Gas sensors are very important in several fields like gas monitoring, safety and environmental applications. In this approach, a new gas sensing concept is investigated which combines the powerful adsorption probability of metal oxide conductive sensors (MOS) with an optical ellipsometric readout. This concept shows promising results to solve the problems of cross sensitivity of the MOS concept.Results: Undoped tin oxide (SnOx) and iron doped tin oxide (Fe:SnOx) thin add-on films were prepared by magnetron sputtering on the top of the actual surface plasmon resonance (SPR) sensing gold layer. The films were tested for their sensitivity to several gas species in the surface plasmon resonance enhanced (SPREE) gas measurement. It was found that the undoped tin oxide (SnOx) shows higher sensitivities to propane (C3H8) then to carbon monoxide (CO). By using Fe:SnOx, this relation is inverted. This behavior was explained by a change of the amount of binding sites for CO in the layer due to this iron doping. For hydrogen (H2) no such relation was found but the sensing ability was identical for both layer materials. This observation was related to a different sensing mechanism for H2 which is driven by the diffusion into the layer instead of adsorption on the surface.Conclusion: The gas sensing selectivity can be enhanced by tuning the properties of the thin film overcoating. A relation of the binding sites in the doped and undoped SnOx films and the gas sensing abilities for CO and C3H8 was found. This could open the path for optimized gas sensing devices with different coated SPREE sensors.https://doi.org/10.3762/bjnano.8.56doped tin oxideellipsometrygas sensingsurface plasmon resonancethin filmstransparent conductive oxides |
| spellingShingle | Daniel Fischer Andreas Hertwig Uwe Beck Volkmar Lohse Detlef Negendank Martin Kormunda Norbert Esser Thin SnOx films for surface plasmon resonance enhanced ellipsometric gas sensing (SPREE) Beilstein Journal of Nanotechnology doped tin oxide ellipsometry gas sensing surface plasmon resonance thin films transparent conductive oxides |
| title | Thin SnOx films for surface plasmon resonance enhanced ellipsometric gas sensing (SPREE) |
| title_full | Thin SnOx films for surface plasmon resonance enhanced ellipsometric gas sensing (SPREE) |
| title_fullStr | Thin SnOx films for surface plasmon resonance enhanced ellipsometric gas sensing (SPREE) |
| title_full_unstemmed | Thin SnOx films for surface plasmon resonance enhanced ellipsometric gas sensing (SPREE) |
| title_short | Thin SnOx films for surface plasmon resonance enhanced ellipsometric gas sensing (SPREE) |
| title_sort | thin snox films for surface plasmon resonance enhanced ellipsometric gas sensing spree |
| topic | doped tin oxide ellipsometry gas sensing surface plasmon resonance thin films transparent conductive oxides |
| url | https://doi.org/10.3762/bjnano.8.56 |
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