A novel, fast-responding, indicator ink for thin film photocatalytic surfaces

A. Mills, J. Hepburn, M. McFarlane

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


A new photocatalyst indicator ink based on methylene blue (MB) is described that allows the presence and activity of a thin (15 nm) photocatalytic film to be assessed in seconds. The ink is very stable (shelf life > 6 months) and the color change (blue to colorless) striking. The ink utilizes a sacrificial electron donor, glycerol, to trap the photogenerated holes, leaving the photogenerated electrons to react with MB to produce its reduced, leuco, form (LMB). The efficacy of the MB ink is due to the presence of acid in its formulation, which curtails significantly the otherwise usual, rapid reoxidation of LMB by ambient O2.
Original languageEnglish
Pages (from-to)1163-1165
Number of pages2
JournalACS Applied Materials and Interfaces
Issue number6
Publication statusPublished - 19 May 2009


  • photocatalysis
  • methylene blue
  • photocatalyst indicator ink
  • photogenerated electrons


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