Fibre optic oxygen sensor based on fluorescence quenching of evanescent-wave excited ruthenium complexes in sol–gel derived porous coatings

Oxygen Control For Bioreactors And In‐vitro Cell Assays

“…While this is a significant reduction compared to the initial value for an uncovered film, it is still larger than a ratio I 0 /I 100 of 3, with which a sensor is commonly considered a suitable oxygen sensing device. 13 The fact that the intensity ratio remains high enough for in-situ use despite this reduction is a direct result of the sensor fabrication process used, which allows one to repeatedly deposit homogeneous films with a high intensity ratio 6 . In addition, the solid-state nature of the sensor significantly reduces the amount of dye needed compared to dissolved sensors and reduces the contact between the biomaterials and sensor through encapsulation in the PS matrix.…”

Applications of the Planar Fiber Optic Chip

“…Potyrailo & Hieftje, 1999) An alternative strategy to increase n clad in the sensing region of a de-clad fiber is the application of a sol-gel cladding containing an analyte sensitive dye. (Browne et al, 1996;Kao et al, 1998;MacCraith et al, 1993;O'Keeffe et al, 1995) A second method to match the V-number between the clad and unclad sensing region of fiber optic sensors is to decrease r in the sensing region through etching the declad fiber. Fluorescent fiber sensors, where the de-clad sensing region has been step-or taper-etched, exhibit a 20 to 50 fold improvement in sensitivity.…”

Indicators for optical oxygen sensors

“…Examples are sol-gel [147,152,154,249], ethyl cellulose or PVC membranes [61], different types of ORMOSILs [39,94,106], polystyrene [91], polysulfones [11,18], poly (dimethylsiloxane) alone [251] or with different amounts of pendant acrylate groups [168], and a blended fluoropolymer matrix consisting of Nafion ® and Aflas ® [83]. In another approach, the [Ru(dpp) 3 ] 2+ complex was adsorbed onto silica and then dispersed in a silicone rubber support [38,93].…”