Palladium/palladium oxide coated electrospun fibers for wearable sweat pH-sensors
Abstract The work describes the development of a flexible, hydrogel embedded pH-sensor that can be integrated in inexpensive wearable and non-invasive devices at epidermal level for electrochemical quantification of H+ ions in sweat. Such a device can be useful for swift, real time diagnosis and for...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2019-06-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-019-45399-2 |
| _version_ | 1818346587615657984 |
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| author | Victor C. Diculescu Mihaela Beregoi Alexandru Evanghelidis Raluca F. Negrea Nicoleta G. Apostol Ionut Enculescu |
| author_facet | Victor C. Diculescu Mihaela Beregoi Alexandru Evanghelidis Raluca F. Negrea Nicoleta G. Apostol Ionut Enculescu |
| author_sort | Victor C. Diculescu |
| collection | DOAJ |
| description | Abstract The work describes the development of a flexible, hydrogel embedded pH-sensor that can be integrated in inexpensive wearable and non-invasive devices at epidermal level for electrochemical quantification of H+ ions in sweat. Such a device can be useful for swift, real time diagnosis and for monitoring specific conditions. The sensors’ working electrodes are flexible poly(methyl methacrylate) electrospun fibers coated with a thin gold layer and electrochemically functionalized with nanostructured palladium/palladium oxide. The response to H+ ions is investigated by cyclic voltammetry and electrochemical impedance spectroscopy while open circuit potential measurements show a sensitivity of aprox. −59 mV per pH unit. The modification of the sensing interface upon basic and acid treatment is characterized by scanning and transmission electron microscopy and the chemical composition by X-ray photoelectron spectroscopy. In order to demonstrate the functionality of the pH-sensor at epidermal level, as a wearable device, the palladium/palladium oxide working electrode and silver/silver chloride reference electrode are embedded within a pad of polyacrylamide hydrogel and measurements in artificial sweat over a broad pH range were performed. Sensitivity up to −28 mV/pH unit, response time below 30 s, temperature dependence of approx. 1 mV/°C as well as the minimum volume to which the sensor responses of 250 nanoliters were obtained for this device. The proposed configuration represents a viable alternative making use of low-cost and fast fabrication processes and materials. |
| first_indexed | 2024-12-13T17:20:38Z |
| format | Article |
| id | doaj.art-c7fc45e1b58b4050bc82d09faa7943c1 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-12-13T17:20:38Z |
| publishDate | 2019-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-c7fc45e1b58b4050bc82d09faa7943c12022-12-21T23:37:19ZengNature PortfolioScientific Reports2045-23222019-06-019111210.1038/s41598-019-45399-2Palladium/palladium oxide coated electrospun fibers for wearable sweat pH-sensorsVictor C. Diculescu0Mihaela Beregoi1Alexandru Evanghelidis2Raluca F. Negrea3Nicoleta G. Apostol4Ionut Enculescu5National Institute of Materials Physics BucharestNational Institute of Materials Physics BucharestNational Institute of Materials Physics BucharestNational Institute of Materials Physics BucharestNational Institute of Materials Physics BucharestNational Institute of Materials Physics BucharestAbstract The work describes the development of a flexible, hydrogel embedded pH-sensor that can be integrated in inexpensive wearable and non-invasive devices at epidermal level for electrochemical quantification of H+ ions in sweat. Such a device can be useful for swift, real time diagnosis and for monitoring specific conditions. The sensors’ working electrodes are flexible poly(methyl methacrylate) electrospun fibers coated with a thin gold layer and electrochemically functionalized with nanostructured palladium/palladium oxide. The response to H+ ions is investigated by cyclic voltammetry and electrochemical impedance spectroscopy while open circuit potential measurements show a sensitivity of aprox. −59 mV per pH unit. The modification of the sensing interface upon basic and acid treatment is characterized by scanning and transmission electron microscopy and the chemical composition by X-ray photoelectron spectroscopy. In order to demonstrate the functionality of the pH-sensor at epidermal level, as a wearable device, the palladium/palladium oxide working electrode and silver/silver chloride reference electrode are embedded within a pad of polyacrylamide hydrogel and measurements in artificial sweat over a broad pH range were performed. Sensitivity up to −28 mV/pH unit, response time below 30 s, temperature dependence of approx. 1 mV/°C as well as the minimum volume to which the sensor responses of 250 nanoliters were obtained for this device. The proposed configuration represents a viable alternative making use of low-cost and fast fabrication processes and materials.https://doi.org/10.1038/s41598-019-45399-2 |
| spellingShingle | Victor C. Diculescu Mihaela Beregoi Alexandru Evanghelidis Raluca F. Negrea Nicoleta G. Apostol Ionut Enculescu Palladium/palladium oxide coated electrospun fibers for wearable sweat pH-sensors Scientific Reports |
| title | Palladium/palladium oxide coated electrospun fibers for wearable sweat pH-sensors |
| title_full | Palladium/palladium oxide coated electrospun fibers for wearable sweat pH-sensors |
| title_fullStr | Palladium/palladium oxide coated electrospun fibers for wearable sweat pH-sensors |
| title_full_unstemmed | Palladium/palladium oxide coated electrospun fibers for wearable sweat pH-sensors |
| title_short | Palladium/palladium oxide coated electrospun fibers for wearable sweat pH-sensors |
| title_sort | palladium palladium oxide coated electrospun fibers for wearable sweat ph sensors |
| url | https://doi.org/10.1038/s41598-019-45399-2 |
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