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2024-08-24
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info:eu-repo/semantics/closedAccess
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Elsevier
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Resumen
Electrospun (ES) non-woven matrices are regarded as promising platforms for the development of miniaturized sensing systems with improved detection capacity. Their high specific surface area and void-to-volume ratio are expected to promote higher and faster interaction of the sensing molecular probes with the target stimuli increasing sensor sensitivity and response time. However, the poor light transparency of ES non-woven mats appears as the main limiting effect regarding their use as optical sensor platforms being important to determine to what extent it affects the sensor prediction accuracy. This work addresses this question providing a comparative analysis of the performance of flat cast and ES non-woven cellulose acetate luminescent platforms loaded with a pH sensitive dye-pair, i.e. fluorescein isothiocyanate (FITC) and rhodamine 6 G (R6G). This study follows a comprehensive approach aiming at clarifying the effect of the platform morphology on the sensitivity of their spectral properties to pH and to understand about the advantages of using dual dye systems for pH detection. The presence of R6G improved remarkably the sensitivity of these ES matrices extending the analytical capacity of the probes to the alkaline range. The emission of ES matrices showed stronger sensitivity to pH. However, pH prediction accuracy was found to depend crucially on a synergistic effect from the platform morphology and the signal analysis methodology. ES non-woven matrices allows for accurate pH prediction, characterized by determination errors < 10 % for pH < 10, by exponential analysis of the dye-pair emission at λExc of 450 nm and λEm of 519 nm. Furthermore, it shows a strong reduction of the determination errors, at extremely acidic conditions, resulting in values comparable to that obtained by analysis of the emission signal from flat cast platforms with more complex Förster Resonance Energy Transfer (FRET) methodologies.
Descripción
The registered version of this article, first published in Surfaces and Interfaces, 53, is available online at the publisher's website: https://doi.org/10.1016/j.surfin.2024.104988
La versión registrada de este artículo, publicado por primera vez en Surfaces and Interfaces, 53, está disponible en línea en el sitio web del editor: https://doi.org/10.1016/j.surfin.2024.104988
The work was performed under the scope of the project PTDC/CTA- AMB/31559/2017 - POCI-01-0145-FEDER-031559, co-funded by Fundo Europeu de Desenvolvimento Regional – FEDER, through Programa Operacional Competitividade e Internacionalizaç˜ao, and by Fundaç˜ao para a Ciˆencia e a Tecnologia I.P., through Orçamento de Estado. The authors also acknowledge the financial support and help from Fundaç˜ao para Ciˆencia e a Tecnologia, FCT-MCTES (Portugal) through the project 2022.04191.PTDC and the Associate Laboratory for Green Chemistry - LAQV (LA/P/0008/2020 DOI:10.54499/LA/P/0008/2020, UIDP/ 50006/2020 DOI:10.54499/UIDP/50006/2020 and UIDB/50006/2020 DOI:10.54499/UIDB/50006/2020), through national funds.
La versión registrada de este artículo, publicado por primera vez en Surfaces and Interfaces, 53, está disponible en línea en el sitio web del editor: https://doi.org/10.1016/j.surfin.2024.104988
The work was performed under the scope of the project PTDC/CTA- AMB/31559/2017 - POCI-01-0145-FEDER-031559, co-funded by Fundo Europeu de Desenvolvimento Regional – FEDER, through Programa Operacional Competitividade e Internacionalizaç˜ao, and by Fundaç˜ao para a Ciˆencia e a Tecnologia I.P., through Orçamento de Estado. The authors also acknowledge the financial support and help from Fundaç˜ao para Ciˆencia e a Tecnologia, FCT-MCTES (Portugal) through the project 2022.04191.PTDC and the Associate Laboratory for Green Chemistry - LAQV (LA/P/0008/2020 DOI:10.54499/LA/P/0008/2020, UIDP/ 50006/2020 DOI:10.54499/UIDP/50006/2020 and UIDB/50006/2020 DOI:10.54499/UIDB/50006/2020), through national funds.
Categorías UNESCO
Palabras clave
Sensor, Fluorescein isothiocyanate, Rhodamine, Electrospinning, Fluorescence, Förster resonance energy transfer (FRET)
Citación
Vieira, T. M., Canejo, J., Huertas, R., Oliveira, H. M., Godinho, M. H., Crespo, J. G., & Portugal, C. A. M. (2024). Electropsun non-woven luminescent two-dye pH sensors: Effect of morphology on the sensing performance. Surfaces and Interfaces, 53. https://doi.org/10.1016/J.SURFIN.2024.104988
Centro
Facultad de Ciencias
Departamento
Ciencias y Técnicas Fisicoquímicas