TY - JOUR
T1 - A composite thin film optical sensor for dissolved oxygen in contaminated aqueous environments
AU - Gillanders, Ross
AU - Tedford, MC
AU - Crilly, PJ
AU - Bailey, RT
PY - 2005/7
Y1 - 2005/7
N2 - 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.
AB - 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.
M3 - Article
SN - 0003-2670
VL - 545
SP - 189
EP - 194
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
IS - 2
ER -