LED-based fibre optic oxygen sensor using sol-gel coating

Dissolved oxygen sensor based on fluorescence quenching of oxygen-sensitive ruthenium complex immobilized on silica–Ni–P composite coating

“…Fifty millilitres of electroless plating solution was prepared with 1.25 g of NiSO 4 , 0.75 mL of lactic acid (11.9 M), 1.5 g of NaH 2 PO 2 , 1.5 mL of Pb(Ac) 2 (1 mg L −1 ) and 5 mL of HAc-NaAc buffer (6.27 M, pH = 5.0). The order of adding the reagents followed closely to the literature method [21].…”

“…Ruthenium(II) complexes are by far the most widely used O 2 indicator because these metal complexes, in general, have efficient luminescence, relatively long-life metal-to-ligand chargetransfer excited states, fast response times, strong visible absorptions, large Stokes shifts and high photochemical stability [2].…”

Opto-Chemical and Opto-Immuno Sensors

“…Its cladding is taken off and the core is coated with the sol-gel layer. The fluorescence is re-captured by the fiber and guided to the photodiode, passing a long-wavelength cut-off filter [309,345].…”

Study and Development of a Fluorescence Based Sensor System for Monitoring Oxygen in Wine Production: The WOW Project

“…The direct transient measurement has been chosen as the operating principle of the sensor in order to develop a more complete, customizable system able to acquire the complete transient and then focus on the signal elaboration [37]. Moreover, the ultra-short excitation pulses required to achieve the lifetime measurement imply that the photo-bleaching is minimal with respect to other measurement approaches.…”