Photoluminiscence response of Ru(II) complex immobilized in SiO2-based matrix to dissolved oxygen in beer.
The possibility to use the photoluminescence of Ru(II) tris(4,7-diphenyl-1,10-phenathroline) dichloride, immobilized in sol-gel produced SiO2-based matrix for the determination of dissolved oxygen concentration in beer is studied. Organically-modified silane (octyltriethoxysilane) and mixtures from tetraethoxysilane and octyltriethoxysilane are used as precursors for matrix production. Spin- and dip-coating techniques are applied for films deposition. The predeposition ultrasound treatment of the sol ensures a good sensitivity and a linear sensor quenching response to oxygen in 1/6 ppm O2-concentration interval. The CO2 present practically has no effect on the films performance. Their photoluminescence show rather good stability on prolonged storage in beer.
Anastasova
S
S
University of Sofia, Faculty of Chemistry, 1, J. Bourchier Blvd., Sofia 1164, Bulgaria.
Milanova
M
M
Todorovsky
D
D
D001515:Beer / Q000032:analysis*; D002245:Carbon Dioxide; D010100:Oxygen / Q000032:analysis* / Q000737:chemistry; D010777:Photochemistry; D017975:Ruthenium Compounds / Q000032:analysis* / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D013050:Spectrometry, Fluorescence / Q000379:methods*
D017975:Ruthenium Compounds; D002245:Carbon Dioxide; D012822:Silicon Dioxide; D010100:Oxygen