UV-Activated Luminescence/Colourimetric O2 Indicator
An oxygen indicator is described, comprising nanoparticles of titania dispersed in hydroxyethyl cellulose (HEC) polymer film containing a sacrificial electron donor, glycerol, and the redox indicator, indigo-tetrasulfonate (ITS). The indicator is blue- coloured in the absence of UV light, however up...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2008-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/2008/547301 |
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| _version_ | 1832550274625961984 |
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| author | Andrew Mills Cheryl Tommons Raymond T. Bailey M. Catriona Tedford Peter J. Crilly |
| author_facet | Andrew Mills Cheryl Tommons Raymond T. Bailey M. Catriona Tedford Peter J. Crilly |
| author_sort | Andrew Mills |
| collection | DOAJ |
| description | An oxygen indicator is described, comprising nanoparticles of titania dispersed in hydroxyethyl cellulose (HEC) polymer film containing a sacrificial electron donor, glycerol, and the redox indicator, indigo-tetrasulfonate (ITS). The indicator is blue- coloured in the absence of UV light, however upon exposure to UV light it not only loses its colour but also luminesces, unless and until it is exposed to oxygen, whereupon its original colour is restored. The initial photobleaching spectral (absorbance and luminescence) response characteristics in air and in vacuum are described and discussed in terms of a simple reaction scheme involving UV activation of the titania photocatalyst particles, which are used to reduce the redox dye, ITS, to its leuco form, whilst simultaneously oxidising the glycerol to glyceraldehye. The response characteristics of the activated, that is, UV photobleached, form of the indicator to oxygen are also reported and the possible uses of such an indicator to measure ambient O2 levels are discussed. |
| format | Article |
| id | doaj-art-58e112cfadac4c4eae272c85bfe923be |
| institution | Kabale University |
| issn | 1110-662X 1687-529X |
| language | English |
| publishDate | 2008-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-58e112cfadac4c4eae272c85bfe923be2025-02-03T06:07:11ZengWileyInternational Journal of Photoenergy1110-662X1687-529X2008-01-01200810.1155/2008/547301547301UV-Activated Luminescence/Colourimetric O2 IndicatorAndrew Mills0Cheryl Tommons1Raymond T. Bailey2M. Catriona Tedford3Peter J. Crilly4Department of Pure and Applied Chemistry, Westchem Graduate School of Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, ScotlandDepartment of Pure and Applied Chemistry, Westchem Graduate School of Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, ScotlandDepartment of Pure and Applied Chemistry, Westchem Graduate School of Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, ScotlandChemical and Biological Sciences, Bell College of Technology, University of the West of Scotland, Hamilton ML3 0JB, ScotlandChemical and Biological Sciences, Bell College of Technology, University of the West of Scotland, Hamilton ML3 0JB, ScotlandAn oxygen indicator is described, comprising nanoparticles of titania dispersed in hydroxyethyl cellulose (HEC) polymer film containing a sacrificial electron donor, glycerol, and the redox indicator, indigo-tetrasulfonate (ITS). The indicator is blue- coloured in the absence of UV light, however upon exposure to UV light it not only loses its colour but also luminesces, unless and until it is exposed to oxygen, whereupon its original colour is restored. The initial photobleaching spectral (absorbance and luminescence) response characteristics in air and in vacuum are described and discussed in terms of a simple reaction scheme involving UV activation of the titania photocatalyst particles, which are used to reduce the redox dye, ITS, to its leuco form, whilst simultaneously oxidising the glycerol to glyceraldehye. The response characteristics of the activated, that is, UV photobleached, form of the indicator to oxygen are also reported and the possible uses of such an indicator to measure ambient O2 levels are discussed.http://dx.doi.org/10.1155/2008/547301 |
| spellingShingle | Andrew Mills Cheryl Tommons Raymond T. Bailey M. Catriona Tedford Peter J. Crilly UV-Activated Luminescence/Colourimetric O2 Indicator International Journal of Photoenergy |
| title | UV-Activated Luminescence/Colourimetric O2 Indicator |
| title_full | UV-Activated Luminescence/Colourimetric O2 Indicator |
| title_fullStr | UV-Activated Luminescence/Colourimetric O2 Indicator |
| title_full_unstemmed | UV-Activated Luminescence/Colourimetric O2 Indicator |
| title_short | UV-Activated Luminescence/Colourimetric O2 Indicator |
| title_sort | uv activated luminescence colourimetric o2 indicator |
| url | http://dx.doi.org/10.1155/2008/547301 |
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