Novel UV-activated colorimetric oxygen indicator

S-K. Lee, M. Sheridan, A. Mills

Research output: Contribution to journalArticlepeer-review

126 Citations (Scopus)


The results of a detailed characterization study of a novel UV-activated colorimetric oxygen indicator are described. The indicator uses nanoparticles of titania to photosensitize the reduction of methylene blue by triethanolamine in a polymer encapsulation medium, using UVA light. Upon UV irradiation, the indicator bleaches and remains in this colorless state in the dark, unless and until it is exposed to oxygen, whereupon its original color is restored. The indicator is reusable and irreversible. The rate of color recovery is proportional to the level of oxygen present. A layer of PET (poly(ethylene terephthalate)), of thickness b, placed on top of the indicator film slows down its response, and the 90% recovery time is proportional to b.
Original languageEnglish
Pages (from-to)2744-2751
Number of pages7
JournalChemistry of Materials
Issue number10
Publication statusPublished - 17 May 2005


  • methylene-blue
  • electron-transfer
  • ascorbic-acid
  • sensor
  • kinetics
  • water
  • film


Dive into the research topics of 'Novel UV-activated colorimetric oxygen indicator'. Together they form a unique fingerprint.

Cite this