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

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 Nafion ® and Aflas ®. Strong phosphorescence, which was strongly quenched by disso...

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Bibliographic Details
Published in:Analytica chimica acta 2005-07, Vol.545 (2), p.189-194
Main Authors: Gillanders, R.N., Tedford, M.C., Crilly, P.J., Bailey, R.T.
Format: Article
Language:English
Subjects:
Aflas
Analytical chemistry
Applied sciences
Chemistry
Dissolved oxygen
Exact sciences and technology
General, instrumentation
Global environmental pollution
Nafion
Phosphorescence
Pollution
Ruthenium(II) complex
Sensor
Spectrometric and optical methods
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Summary: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 Nafion ® and Aflas ®. 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.
ISSN:0003-2670
1873-4324
DOI:10.1016/j.aca.2005.04.086