Photoluminescence-based oxygen sensor with platinum-octaethylporphyrin dye integrated into oxidized porous silicon layer

Braga, Mauro S.; Matos, Keth R. Maciel de; Borges, Victor F.; Gomes, Orisson Ponce; Salcedo, Walter J.

doi:10.1109/sbmicro.2013.6676164

Cited by 1 publication

(2 citation statements)

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“…Fluorescence sensing is an established approach in chemical and biochemical sensing. It frequently utilizes fluorescent dyes or other suitable reagents, which react to the presence of an analyte by modulating their fluorescent decay times [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. When this very versatile approach is applied to sensor design and on-line measurements, fluorescent dyes/reagents are often immobilized, or incorporated into different thin films of other layers.…”

Section: Introductionmentioning

confidence: 99%

“…Molecules of the analyte penetrate the surface of these thin films or layers, and interact with the immobilized fluorescent dye/reagent to modulate their decay times. The incorporation of fluorescent dyes/reagents into porous materials or polymer matrices is thus a common approach in building fluorescence sensors [ 1 , 3 , 4 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. The immobilization of fluorescent dyes or reagents in thin films or active layers, however, brings several limitations, which are often reflected in long-term measurement system zero-point drifts, hysteresis, limited signal amplitude/quality, and film material compatibility issues with operating environments.…”

Section: Introductionmentioning

confidence: 99%

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A Microfluidic, Flow-Through, Liquid Reagent Fluorescence Sensor Applied to Oxygen Concentration Measurement

Gril,

Donlagic

2023

Sensors

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A concept of a microfluidic fluorescent chemical sensing system is presented and demonstrated as a sensor for measurement of dissolved oxygen in water. The system utilizes on-line mixing of a fluorescent reagent with the analyzed sample, while it measures the fluorescence decay time of the mixture. The system is built entirely out of silica capillaries and optical fibers, and allows for very low consumption of the reagent (of the order of mL/month) and the analyzed sample (of the order of L/month). The proposed system can, thus, be applied to continuous on-line measurements, while utilizing a broad variety of different and proven fluorescent reagents or dyes. The proposed system allows for the use of relatively high-excitation light powers, as the flow-through concept of the system reduces the probability of the appearance of bleaching, heating, or other unwanted effects on the fluorescent dye/reagent caused significantly by the excitation light. The high amplitudes of fluorescent optical signals captured by an optical fiber allow for low-noise and high-bandwidth optical signal detection, and, consequently, the possibility for utilization of reagents with nanosecond fluorescent lifetimes.

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