UV-activated luminescence/colourimetric O(2) indicator

Andrew Mills, Cheryl Tommons, Raymond T. Bailey, M. Catriona Tedford, Peter J. Crilly

Research output: Contribution to journalArticle

Abstract

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 levels are discussed.
Original languageEnglish
Article number547301
JournalInternational Journal of Photoenergy
DOIs
Publication statusPublished - 2008

Cite this

Mills, Andrew ; Tommons, Cheryl ; Bailey, Raymond T. ; Tedford, M. Catriona ; Crilly, Peter J. / UV-activated luminescence/colourimetric O(2) indicator. In: International Journal of Photoenergy. 2008.
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UV-activated luminescence/colourimetric O(2) indicator. / Mills, Andrew; Tommons, Cheryl; Bailey, Raymond T.; Tedford, M. Catriona; Crilly, Peter J.

In: International Journal of Photoenergy, 2008.

Research output: Contribution to journalArticle

TY - JOUR

T1 - UV-activated luminescence/colourimetric O(2) indicator

AU - Mills, Andrew

AU - Tommons, Cheryl

AU - Bailey, Raymond T.

AU - Tedford, M. Catriona

AU - Crilly, Peter J.

PY - 2008

Y1 - 2008

N2 - 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 levels are discussed.

AB - 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 levels are discussed.

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JO - International Journal of Photoenergy

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