A composite thin film optical sensor for dissolved oxygen in contaminated aqueous environments

Ross Gillanders, MC Tedford, PJ Crilly, RT Bailey

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

A robust optical composite thin film dissolved oxygen sensor was fabricated by ionically trapping the dye ruthenium(II) tris(4,7-diphenyl-1,10-phenanthroline) dichloride in a blended fluoropolymer matrix consisting of Nation (R) and Aflas (R). Strong phosphorescence, which was strongly quenched by dissolved oxygen (DO), was observed when the sensor was immersed in water. The sensor was robust, optically transparent, with good mechanical properties. Fast response, of a few seconds, coupled with sensitivity of about 0.1 mg L-1 (DO) over the range 0-30 mg L-1 and resistance to leaching, were also exhibited by this system. The Stern-Volmer (SV) plot exhibited slight downward turning at all oxygen concentrations. A linear plot was obtained when the SV equation was modified to account for the varying sensitivity of dye molecules in the matrix to the quencher. Good long term stability was observed.
Original languageEnglish
Pages (from-to)189-194
JournalAnalytica Chimica Acta
Volume545
Issue number2
Publication statusPublished - Jul 2005

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