Photocatalyst activity indicating adhesive labels for use in the field

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    The preparation and characterisation of a resazurin-based photocatalyst activity indicator label is described. The label is applied to a number of different TiO2-based, photocatalytic materials, including self-cleaning: glass, tile, paint and awning materials, as well as a thin, sol-gel film, produced in-house. In all cases, the label exhibited a blue to pink colour transition upon irradiation with UV light. In most cases, the time taken to bleach 90% of the red component of the digital image of the ink, ttb(90), was twice that for a traditional Rz ink, produced by the drawdown method, since the former was twice as thick. Although not as fast as a drawdown Rz ink, by a factor of ca. Two, it still only takes minutes to change and the Rz label is much more easily used, stored and does not need the sample to be: very smooth, horizontal or flat. As such it appears ideal for testing samples, both quantitatively and qualitatively in situ, i.e. in the field.


    • Photocatalyst activity indicating adhesive labels for use in the field

      Rights statement: Copyright 2018 Elsevier. This manuscript is distributed under a Creative Commons Attribution-NonCommercial-NoDerivs License (, which permits distribution and reproduction for non-commercial purposes, provided the author and source are cited.

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    Original languageEnglish
    Number of pages7
    Pages (from-to)256-262
    JournalJournal of Photochemistry and Photobiology A: Chemistry
    Journal publication dateApr 2018
    Early online date04 Jan 2018
    Publication statusPublished - Apr 2018

    ID: 139690762