Conduction mechanism switch for SnO2 based sensors during operation in application relevant conditions; implications for modeling of sensing
In this paper we present experimental evidence for a conduction mechanism switch for gas sensors based on SnO2 porous, thick film sensing layers under exposure to CO in the presence of humidity. In dry air and CO concentration below 250ppm the conduction is controlled by the surface depletion layers...
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| Veröffentlicht in: | Sensors and actuators. B, Chemical Chemical, 2015-02, Vol.207, p.455-459 |
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| container_title | Sensors and actuators. B, Chemical |
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| creator | Barsan, Nicolae Rebholz, Julia Weimar, Udo |
| description | In this paper we present experimental evidence for a conduction mechanism switch for gas sensors based on SnO2 porous, thick film sensing layers under exposure to CO in the presence of humidity. In dry air and CO concentration below 250ppm the conduction is controlled by the surface depletion layers formed by the trapping of electrons from conduction band on adsorbed oxygen species. In the presence of humidity and at CO concentration exceeding 3ppm the surface depletion layers are replaced by surface accumulation layers and the conduction mechanism changes accordingly. We also present a model that takes into account the influence of humidity at low CO concentrations. |
| doi_str_mv | 10.1016/j.snb.2014.10.016 |
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We also present a model that takes into account the influence of humidity at low CO concentrations.</description><subject>CO and humidity</subject><subject>Conduction mechanism</subject><subject>Depletion</subject><subject>Depletion and accumulation layer</subject><subject>Detection</subject><subject>Humidity</subject><subject>Sensors</subject><subject>Switches</subject><subject>Thick films</subject><subject>Tin dioxide</subject><subject>Tin oxides</subject><issn>0925-4005</issn><issn>1873-3077</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><recordid>eNp9kE9vEzEQxS1UJNLCB-DmI5cNY-9uvFFPVUQBqVIPhbPlP2PqaNfeejZF_Q58aJwEcexpZp7f-0l-jH0UsBYgNp_3a0p2LUF09V5X5Q1biUG1TQtKXbAVbGXfdAD9O3ZJtAeArt3Aiv3Z5eQPbok58Qndo0mRJk6_4-IeeciFP6R7ya0h9JwwUS7E_aHE9IvnGYs5BWPiZp7H6M5nwRGfTVq4q-x4lOiax-m_gU7gKXscT5xwItf1PXsbzEj44d-8Yj9vv_zYfWvu7r9-393cNa5r1dLY1qoge9872Aa0DsF2GIyQLUjptrY-oRRK-mEQLnhlO6HUZrAKQJnQ9u0V-3TmziU_HZAWPUVyOI4mYT6QFoPYwCA6OVSrOFtdyUQFg55LnEx50QL0sXm917V5fWz-KFWlZq7PGax_eI5YNLmIyaGPBd2ifY6vpP8CuPmPiA</recordid><startdate>20150201</startdate><enddate>20150201</enddate><creator>Barsan, Nicolae</creator><creator>Rebholz, Julia</creator><creator>Weimar, Udo</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7SR</scope><scope>7TB</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>FR3</scope><scope>JG9</scope><scope>L7M</scope></search><sort><creationdate>20150201</creationdate><title>Conduction mechanism switch for SnO2 based sensors during operation in application relevant conditions; implications for modeling of sensing</title><author>Barsan, Nicolae ; Rebholz, Julia ; Weimar, Udo</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c437t-b3b7f25d5c09febce0b4efa123022c9b25de2172d881cfd7b417768b7007af353</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>CO and humidity</topic><topic>Conduction mechanism</topic><topic>Depletion</topic><topic>Depletion and accumulation layer</topic><topic>Detection</topic><topic>Humidity</topic><topic>Sensors</topic><topic>Switches</topic><topic>Thick films</topic><topic>Tin dioxide</topic><topic>Tin oxides</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Barsan, Nicolae</creatorcontrib><creatorcontrib>Rebholz, Julia</creatorcontrib><creatorcontrib>Weimar, Udo</creatorcontrib><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Engineered Materials Abstracts</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Sensors and actuators. 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In dry air and CO concentration below 250ppm the conduction is controlled by the surface depletion layers formed by the trapping of electrons from conduction band on adsorbed oxygen species. In the presence of humidity and at CO concentration exceeding 3ppm the surface depletion layers are replaced by surface accumulation layers and the conduction mechanism changes accordingly. We also present a model that takes into account the influence of humidity at low CO concentrations.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.snb.2014.10.016</doi><tpages>5</tpages></addata></record> |
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| ispartof | Sensors and actuators. B, Chemical, 2015-02, Vol.207, p.455-459 |
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| language | eng |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | CO and humidity Conduction mechanism Depletion Depletion and accumulation layer Detection Humidity Sensors Switches Thick films Tin dioxide Tin oxides |
| title | Conduction mechanism switch for SnO2 based sensors during operation in application relevant conditions; implications for modeling of sensing |
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