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EnglishIn the study of conductive conjugated polymers, electrical doping has long played an important role. A new polymeric gas sensor has been successfully fabricated by means of an ink-jet printer using a conductive aqueous formulation of poly(3,4-ethylenedioxythiophene) poly(styrene-sulfonate) (PEDOT:PSS). A simple yet robust treatment method for the irreversible secondary doping was performed (by H2SO4 and MeOH post-treatments) to enhance conductivity and improve gas sensing performance. Real time gas sensing measurements were carried out by exposing the devices with eight different analytes in a low concentrations range of VOCs vapors up to 5 % of the saturated vapor pressure, 10 ppm of NO2 and up to 10 % of relative humidity (RH) at 21 °C, exploiting dry air as carrier and diluting gas. The gas response, obtained as the ratio between the steady-state resistance variation and the baseline resistance of the device, was evaluated for different PEDOT:PSS post-treated sensors. An unexpected behavior of PEDOT:PSS post-treated with concentrated H2SO4 was observed, while MeOH and diluted H2SO4 post-treated sensors exhibited improved response towards all investigated analytes. The best performances were obtained towards 5 % of ammonia and NO2 with a gas response of 6 % and 28 % respectively with the device post-treated with pure methanol and 16 % with the sensor post-treated with diluted sulfuric acid. Furthermore, long-term stability and the influence of temperature were evaluated on the fabricated sensors. Altogether, these promising results allow a better understanding of the secondary doping effects on the electrical and sensing properties, paving the way for electronic nose development.
The Effects Of Secondary Doping On Ink-Jet Printed PEDOT:PSS Gas Sensors For VOCs and NO2 Detection / Vigna, L.; Verna, A.; Marasso, S. L.; Sangermano, M.; D’Angelo, P.; Pirri, F. C.; Cocuzza, M.. - In: SENSORS AND ACTUATORS. B, CHEMICAL. - ISSN 0925-4005. - ELETTRONICO. - 345(2021), p. 130381. [10.1016/j.snb.2021.130381]
| Titolo: | The Effects Of Secondary Doping On Ink-Jet Printed PEDOT:PSS Gas Sensors For VOCs and NO2 Detection | |
| Autori: | ||
| Data di pubblicazione: | 2021 | |
| Rivista: | ||
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.snb.2021.130381 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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| File | Descrizione | Tipologia | Licenza | |
|---|---|---|---|---|
| The Effects of Secondary Doping On Ink-Jet Printed PEDOT-PSS Gas Sensors For VOCs Detection - LV v8.pdf | 2. Post-print / Author's Accepted Manuscript |  | Embargo: 29/06/2023 Richiedi una copia | |
| 2021 - Vigna - The Effects of Secondary Doping On Ink-Jet Printed PEDOT-PSS Gas Sensors For VOCs Detection.pdf | 2a Post-print versione editoriale / Version of Record | Non Pubblico - Accesso privato/ristretto | Administrator Richiedi una copia |
http://hdl.handle.net/11583/2910876
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