Design of a fibre-optic pH sensor with rapid response

Attridge, John; Leaver, K. D.; Cozens, J.R.

doi:10.1088/0022-3735/20/5/016

Cited by 17 publications

(7 citation statements)

References 11 publications

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“…Probably the first fiber optic pH sensor based on RI transduction was designed by Attridge et al 47 Two methods were used in parallel. The sensing material on the fiber comprises an ion exchange membrane carrying a sulfophthalein dye acting as an indicator.…”

Section: Sensing Formatsmentioning

confidence: 99%

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

2020

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This is the first comprehensive review on methods and materials for use in optical sensing of pH values and on applications of such sensors. The Review starts with an introduction that contains subsections on the definition of the pH value, a brief look back on optical methods for sensing of pH, on the effects of ionic strength on pH values and p K a values, on the selectivity, sensitivity, precision, dynamic ranges, and temperature dependence of such sensors. Commonly used optical sensing schemes are covered in a next main chapter, with subsections on methods based on absorptiometry, reflectometry, luminescence, refractive index, surface plasmon resonance, photonic crystals, turbidity, mechanical displacement, interferometry, and solvatochromism. This is followed by sections on absorptiometric and luminescent molecular probes for use pH in sensors. Further large sections cover polymeric hosts and supports, and methods for immobilization of indicator dyes. Further and more specific sections summarize the state of the art in materials with dual functionality (indicator and host), nanomaterials, sensors based on upconversion and 2-photon absorption, multiparameter sensors, imaging, and sensors for extreme pH values. A chapter on the many sensing formats has subsections on planar, fiber optic, evanescent wave, refractive index, surface plasmon resonance and holography based sensor designs, and on distributed sensing. Another section summarizes selected applications in areas, such as medicine, biology, oceanography, bioprocess monitoring, corrosion studies, on the use of pH sensors as transducers in biosensors and chemical sensors, and their integration into flow-injection analyzers, microfluidic devices, and lab-on-a-chip systems. An extra section is devoted to current challenges, with subsections on challenges of general nature and those of specific nature. A concluding section gives an outlook on potential future trends and perspectives.

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Section: Sensing Formatsmentioning

confidence: 99%

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

2020

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“…14.12) [135]. The authors designed a 2,4,6-triaryl-pyrylium cation (20), magenta in color, in which, upon exposure to sulfide anion, the magenta pyrylium complex transforms into a blue thiopyrylium compound (21). A highly selective sensor arises from the selective incorporation of the sulfide anion instead of a thermodynamic binding event.…”

Section: Applications and Examples Irreversible Chemodosimeter-analytmentioning

confidence: 99%

“…Molecules that exhibit a change in color due to a shift in pH have been utilized in everything from simple titrations [5], for the determination of acid/base concentrations, to pH-responsive films [6][7][8][9][10][11][12][13][14][15] and fiber-optic flow cells [16][17][18][19][20][21] for various applications. Furthermore, pHresponsive molecules have found utility in indicator displacement assays (IDAs), allowing for the detection of a wide variety of analytes [22,23].…”

Section: Introductionmentioning

confidence: 99%

“…Another useful triphenylmethane pH indicator is phenol red (5), which changes from yellow to red over a range 6.4-8.2, making it useful in various physiological applications. It has been incorporated into sol-gel matrices [11] and more commonly into fiber-optic flow cells [16][17][18][19][20][21] to continuously monitor pH. Xanthene dyes (6)(7)(8) are the smallest class listed here and are more commonly used as fluorescent dyes than colorimetric indicators.…”

mentioning

confidence: 99%

“…12 A chemodosimeter for sulfide where the sulfide reacts with the magenta pyrylium(20) to form a blue thiopyrylium(21).…”

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confidence: 99%

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