Dopant passivation by adsorbed water monomers causes high humidity sensitivity in PEDOT: PSS thin films at ppm-level humidity
Thin layers of hole conducting polymer poly(3,4-ethylenedioxythiophene)–poly(styrenesulfonate) (PEDOT:PSS) are widely utilized in the fabrication of organic light emitting devices. More recently, the material has been considered as a platform for humidity sensor fabrication. This is interesting as t...
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| Veröffentlicht in: | Sensors and actuators. B, Chemical Chemical, 2019-08, Vol.293, p.329-335 |
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| container_title | Sensors and actuators. B, Chemical |
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| creator | Hossein-Babaei, Faramarz Akbari, Tahereh Harkinezhad, Benyamin |
| description | Thin layers of hole conducting polymer poly(3,4-ethylenedioxythiophene)–poly(styrenesulfonate) (PEDOT:PSS) are widely utilized in the fabrication of organic light emitting devices. More recently, the material has been considered as a platform for humidity sensor fabrication. This is interesting as the conductive component of this composite, PEDOT, is hydrophobic. Moreover, charge transport mechanism in PEDOT:PSS is not yet fully established and understanding the cause of sensitivity to humidity may shed further light on the obscure charge conduction in this conductive polymer composite. Here, we investigate the humidity sensitivity in PEDOT:PSS thin films in a wide relative humidity (RH) range and report the existence of a distinctly higher humidity sensitivity in the RH |
| doi_str_mv | 10.1016/j.snb.2019.05.018 |
| format | Article |
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More recently, the material has been considered as a platform for humidity sensor fabrication. This is interesting as the conductive component of this composite, PEDOT, is hydrophobic. Moreover, charge transport mechanism in PEDOT:PSS is not yet fully established and understanding the cause of sensitivity to humidity may shed further light on the obscure charge conduction in this conductive polymer composite. Here, we investigate the humidity sensitivity in PEDOT:PSS thin films in a wide relative humidity (RH) range and report the existence of a distinctly higher humidity sensitivity in the RH < 1% range. The observed sensitivity is electronic in nature, and is described by considering the hydrogen bonding of the airborne water monomers to the surface-exposed sulfonate groups on the hydrophilic PSS chain, which, in turn, passivates the doping process involving hydrogen ion transfer to the PEDOT chain from those sulfonate groups. This dopant passivation mechanism reduces the charge carrier population in the layer and increases its impedance. The results are anticipated to pave the way for the fabrication of a printable organic humidity sensor with an unprecedented wide dynamic range spanning to sub-ppm humidity levels.</description><identifier>ISSN: 0925-4005</identifier><identifier>EISSN: 1873-3077</identifier><identifier>DOI: 10.1016/j.snb.2019.05.018</identifier><language>eng</language><publisher>Lausanne: Elsevier B.V</publisher><subject>Charge transport ; Conducting polymers ; Current carriers ; Dopant passivation ; Dopants ; Humidity ; Humidity sensitivity ; Hydrogen bonding ; Hydrogen ion transfer ; Hydrogen ions ; Monomers ; Organic light emitting diodes ; Passivity ; PEDOT:PSS ; Polymer matrix composites ; Relative humidity ; Sensing mechanism ; Sensitivity ; Thin films</subject><ispartof>Sensors and actuators. 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B, Chemical</title><description>Thin layers of hole conducting polymer poly(3,4-ethylenedioxythiophene)–poly(styrenesulfonate) (PEDOT:PSS) are widely utilized in the fabrication of organic light emitting devices. More recently, the material has been considered as a platform for humidity sensor fabrication. This is interesting as the conductive component of this composite, PEDOT, is hydrophobic. Moreover, charge transport mechanism in PEDOT:PSS is not yet fully established and understanding the cause of sensitivity to humidity may shed further light on the obscure charge conduction in this conductive polymer composite. Here, we investigate the humidity sensitivity in PEDOT:PSS thin films in a wide relative humidity (RH) range and report the existence of a distinctly higher humidity sensitivity in the RH < 1% range. The observed sensitivity is electronic in nature, and is described by considering the hydrogen bonding of the airborne water monomers to the surface-exposed sulfonate groups on the hydrophilic PSS chain, which, in turn, passivates the doping process involving hydrogen ion transfer to the PEDOT chain from those sulfonate groups. This dopant passivation mechanism reduces the charge carrier population in the layer and increases its impedance. The results are anticipated to pave the way for the fabrication of a printable organic humidity sensor with an unprecedented wide dynamic range spanning to sub-ppm humidity levels.</description><subject>Charge transport</subject><subject>Conducting polymers</subject><subject>Current carriers</subject><subject>Dopant passivation</subject><subject>Dopants</subject><subject>Humidity</subject><subject>Humidity sensitivity</subject><subject>Hydrogen bonding</subject><subject>Hydrogen ion transfer</subject><subject>Hydrogen ions</subject><subject>Monomers</subject><subject>Organic light emitting diodes</subject><subject>Passivity</subject><subject>PEDOT:PSS</subject><subject>Polymer matrix composites</subject><subject>Relative humidity</subject><subject>Sensing mechanism</subject><subject>Sensitivity</subject><subject>Thin films</subject><issn>0925-4005</issn><issn>1873-3077</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNp9kE9r3DAQxUVoIdu0H6A3Qc52R7ItW8mpJOkfCCSQ9CxkaZTVsrYcSbtlD_3u1bKhx55mBt5v3uMR8plBzYCJL5s6zWPNgckauhrYcEZWbOibqoG-f0dWIHlXtQDdOfmQ0gYA2kbAivy5DYueM110Sn6vsw8zHQ9U2xTiiJb-1hkjncIcJoyJGr1LmOjav6zpejd56_OBJpyTz35_3P1MH-9uH56v6OPTE83rcju_nRLVxWOZqi3ucfsP_UjeO71N-OltXpBf3-6eb35U9w_ff958va9MI4dc9WwYucDBwlAyoZZGdJZb6wZkvWkd56PtnRTCmEEIJ2XbOGfbsR0tb4WQzQW5PP1dYnjdYcpqE3ZxLpaK8042bc87KCp2UpkYUoro1BL9pONBMVDHltVGlZbVsWUFnSotF-b6xGCJv_cYVTIeZ4PWRzRZ2eD_Q_8FqCaHfw</recordid><startdate>20190815</startdate><enddate>20190815</enddate><creator>Hossein-Babaei, Faramarz</creator><creator>Akbari, Tahereh</creator><creator>Harkinezhad, Benyamin</creator><general>Elsevier B.V</general><general>Elsevier Science Ltd</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>20190815</creationdate><title>Dopant passivation by adsorbed water monomers causes high humidity sensitivity in PEDOT: PSS thin films at ppm-level humidity</title><author>Hossein-Babaei, Faramarz ; Akbari, Tahereh ; Harkinezhad, Benyamin</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c398t-718b26e8d08bedea9c65d2ddf8e17c4f22bd7f966cc866f9943ffd4b4bd246693</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Charge transport</topic><topic>Conducting polymers</topic><topic>Current carriers</topic><topic>Dopant passivation</topic><topic>Dopants</topic><topic>Humidity</topic><topic>Humidity sensitivity</topic><topic>Hydrogen bonding</topic><topic>Hydrogen ion transfer</topic><topic>Hydrogen ions</topic><topic>Monomers</topic><topic>Organic light emitting diodes</topic><topic>Passivity</topic><topic>PEDOT:PSS</topic><topic>Polymer matrix composites</topic><topic>Relative humidity</topic><topic>Sensing mechanism</topic><topic>Sensitivity</topic><topic>Thin films</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hossein-Babaei, Faramarz</creatorcontrib><creatorcontrib>Akbari, Tahereh</creatorcontrib><creatorcontrib>Harkinezhad, Benyamin</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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This is interesting as the conductive component of this composite, PEDOT, is hydrophobic. Moreover, charge transport mechanism in PEDOT:PSS is not yet fully established and understanding the cause of sensitivity to humidity may shed further light on the obscure charge conduction in this conductive polymer composite. Here, we investigate the humidity sensitivity in PEDOT:PSS thin films in a wide relative humidity (RH) range and report the existence of a distinctly higher humidity sensitivity in the RH < 1% range. The observed sensitivity is electronic in nature, and is described by considering the hydrogen bonding of the airborne water monomers to the surface-exposed sulfonate groups on the hydrophilic PSS chain, which, in turn, passivates the doping process involving hydrogen ion transfer to the PEDOT chain from those sulfonate groups. This dopant passivation mechanism reduces the charge carrier population in the layer and increases its impedance. 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| ispartof | Sensors and actuators. B, Chemical, 2019-08, Vol.293, p.329-335 |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Charge transport Conducting polymers Current carriers Dopant passivation Dopants Humidity Humidity sensitivity Hydrogen bonding Hydrogen ion transfer Hydrogen ions Monomers Organic light emitting diodes Passivity PEDOT:PSS Polymer matrix composites Relative humidity Sensing mechanism Sensitivity Thin films |
| title | Dopant passivation by adsorbed water monomers causes high humidity sensitivity in PEDOT: PSS thin films at ppm-level humidity |
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