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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Autores principales:	Victor C. Diculescu, Mihaela Beregoi, Alexandru Evanghelidis, Raluca F. Negrea, Nicoleta G. Apostol, Ionut Enculescu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2019
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c7fc45e1b58b4050bc82d09faa7943c1
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spelling	oai:doaj.org-article:c7fc45e1b58b4050bc82d09faa7943c12021-12-02T15:08:48ZPalladium/palladium oxide coated electrospun fibers for wearable sweat pH-sensors10.1038/s41598-019-45399-22045-2322https://doaj.org/article/c7fc45e1b58b4050bc82d09faa7943c12019-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-019-45399-2https://doaj.org/toc/2045-2322Abstract 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.Victor C. DiculescuMihaela BeregoiAlexandru EvanghelidisRaluca F. NegreaNicoleta G. ApostolIonut EnculescuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 9, Iss 1, Pp 1-12 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q 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
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.
format	article
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
title	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_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_sort	palladium/palladium oxide coated electrospun fibers for wearable sweat ph-sensors
publisher	Nature Portfolio
publishDate	2019
url	https://doaj.org/article/c7fc45e1b58b4050bc82d09faa7943c1
work_keys_str_mv	AT victorcdiculescu palladiumpalladiumoxidecoatedelectrospunfibersforwearablesweatphsensors AT mihaelaberegoi palladiumpalladiumoxidecoatedelectrospunfibersforwearablesweatphsensors AT alexandruevanghelidis palladiumpalladiumoxidecoatedelectrospunfibersforwearablesweatphsensors AT ralucafnegrea palladiumpalladiumoxidecoatedelectrospunfibersforwearablesweatphsensors AT nicoletagapostol palladiumpalladiumoxidecoatedelectrospunfibersforwearablesweatphsensors AT ionutenculescu palladiumpalladiumoxidecoatedelectrospunfibersforwearablesweatphsensors
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Palladium/palladium oxide coated electrospun fibers for wearable sweat pH-sensors

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