A solvent-based intelligence ink for oxygen

A. Mills, D. Hazafy

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


A solvent-based, irreversible oxygen indicator ink is described, comprising semiconductor photocatalyst nanoparticles, a solvent-soluble redox dye, mild reducing agent and polymer. Based on such an ink, a film - made of titanium dioxide, a blue, solvent-soluble, coloured ion-paired methylene blue dye, glycerol and the polymer zein - loses its colour rapidly (<30 s) upon exposure to UVA light and remains colourless in an oxygen-free atmosphere, returning to its original blue colour upon exposure to air. In the latter step the rate of colour recovery is proportional to the level of ambient oxygen and the same film can be UV-activated repeatedly. The mechanism of this novel, UV-activated, solvent-based, colorimetric oxygen indicator is discussed, along with its possible applications.
Original languageEnglish
Pages (from-to)213-218
Number of pages5
Issue number2
Publication statusPublished - 2008


  • solvent-based irreversible oxygen indicator ink
  • semiconductor photocatalyst nanoparticles
  • solvent-soluble redox dye
  • titanium dioxide
  • methylene blue dye
  • polymer zein
  • ambient oxygen
  • UV-activated
  • colorimetric oxygen indicator
  • oxygen indicator ink
  • ink

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