Development of a LED-based phase fluorimetric oxygen sensor using evanescent wave excitation of a sol-gel immobilized dye

O'Keeffe, Gerard; MacCraith, Brian D.; McEvoy, Aisling K.; McDonagh, Colette; McGilp, J. F.

doi:10.1016/0925-4005(95)01687-2

Cited by 77 publications

(31 citation statements)

References 8 publications

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“…Using this configuration, it was possible to determine copper using the cuprizone method and ammonia 3 using the indophenol method with 90% of the sensitivity of a spectrometer. LEDs have also been used in fluorescence intensity-based sensors 14 and phase fluorimetry 15 .…”

Section: Introductionmentioning

confidence: 99%

Photometric detection in flow analysis systems using integrated PEDDs

Toole

Lau

Diamond

2005

Talanta

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A novel inexpensive optical sensing technique has been developed for colorimetric flow analysis. This sensing system employs two LEDs whereby one is used as the light source and the other as a light detector. The LED used as light detector is reverse biased with a 5V supply so that the photocurrent generated by the incident light discharges the capacitance. Direct digital output is provided by a simple timer circuit that measures the time taken for this discharge process from 5V (logic 1) to 1.7V (logic 0). This sensing concept has been applied in flow analysis by constructing an optical flow cell with a pair of LEDs. Calibration of the integrated optical flow cell using a dye resulted in a linear response that obeys the Beer-Lambert Law. The flow rate, dynamic range, sensitivity and limits of detection were investigated. The system was also used for pH determination in the range of pH 2.5 -6.8 using bromocresol green (BCG). The pK a of BCG was successfully determined by this technique.

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Section: Introductionmentioning

confidence: 99%

Photometric detection in flow analysis systems using integrated PEDDs

Toole

Lau

Diamond

2005

Talanta

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“…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.…”

Section: Fiber Optic Based Fluorescence Sensorsmentioning

confidence: 99%

Applications of the Planar Fiber Optic Chip

Beam¹,

Burnett²,

Webster³

et al. 2012

Recent Progress in Optical Fiber Research

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“…Methyl triethoxysilane (MTEOS) was used as the sol-gel precursor since under optimum conditions it creates a smooth coating with good adhesion (in contrast to tetraethyl orthosilicate (TEOS) which develop cracks and peel easily) [18]. Ruthenium bathophenanthroline perchlorate was chosen as the luminophore as it has been repeatedly demonstrated to demonstrate significant oxygen sensitivity in its luminescence [19,20,21]. Two formulations were employed, consisting of: Ruthenium, MTEOS, ethanol, acetone and hydrochloric acid.…”

Section: Psp Formulations and Applicationmentioning

confidence: 99%