A hetero-core structured fiber optic pH sensor

Seki, Atsushi; Katakura, Hisakazu; Kai, Toshinori; Iga, Mitsuhiro; Watanabe, Kazuhiro

doi:10.1016/j.aca.2006.08.061

Cited by 49 publications

(19 citation statements)

References 14 publications

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“…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.…”

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confidence: 99%

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Colorimetric Sensor Design

2011

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Colorimetric Sensor Design

2011

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“…So far, many approaches have been developed for constructing pH sensors [5][6][7][8][9][10][11][12][13][14][15]. Among these methods, the preparation of fiber optic pH sensors has attracted much research effort.…”

Section: Introductionmentioning

confidence: 99%

Flow Injection Small-volume Fiber-optic pH Sensor Based on Evanescent Wave Excitation and Fluorescence Determination

Xiong

Huang

et al. 2010

J Fluoresc

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A small-volume fiber-optic pH sensor (FOEWS) based on evanescent wave excitation is developed and evaluated. The sensor is simply fabricated by inserting a decladded optical fiber into a transparent capillary tube. A microchannel between the optical fiber and the capillary inner wall was formed and acted as flow cell for solution flowing through. The pH-sensitive fluorophore of fluorescein can be excited by the evanescent wave field produced on the fiber core surface to produce emission fluorescence. pH value was then sensed by its enhancing effect on the emission fluorescence intensity. The response range of the sensor is from pH 2.09 to pH 8.85 and the linear range is from pH 3.25 to 8.85. The proposed sensor has a small detection volume of 2.5 μL and a short response time of 8 s. It has been applied to measure pH values of real water samples and was in good agreement with the results obtained by commercial pH meter.

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“…As regard as the modification of the optical fiber structure it can be mentioned the fabrication of optical fiber sensors by means of hetero-core optical fibers (HCOF) [105][106][107], tapers [22,108,109] or side-polished fibers [94] cresol red, chlorophenol red, bromophenol blue + CNTs [115] Cresol red, chlorophenol red, bromophenol blue [95,96] Ethyl violet [97] Bromophenol blue [98] Bromocresol green & cresol red [99] silica matrix [100] methyl orange sol-gel [101] polymeric film [102] CRMMF/CRPOF [110,111] while the use of special optical fibers for the fabrication of sensors is mainly referred to hollow-core fibers (HCFs) [112,108] and microstructured optical fibers (MOFs) [113,114].…”

Section: Absorbance-based Sensorsmentioning

confidence: 99%

Nanostructured Materials in Optical Fiber Sensing

Hernáez¹

2013

TOOPTSJ

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This work comprehends a review of nanostructured materials employed in the fabrication of optical fiber sensors in the last years. The continuous advances in nanofabrication techniques have enabled to manipulate the matter precisely producing well defined nanostructurated coatings or repetitive patterns at nanoscale level. The interactions of light with these nano-organized materials or patterns at the nanoscale level enable to observe interesting phenomena, such as interferometry, fluorescence, absorbance, resonances and many others which can be exploited in the fabrication of sensing devices. A particular case consists of optical fiber sensors, where the light travelling through an optical fiber interacts with the sensitive layer. The properties of the sensitive layer, such as the organization, physical properties, chemical bounds etc. will determine the sensing characteristics of the final device. The utilization of some of the most common nanostructured materials, such as polymers, nanoparticles, metals, metal oxides or biological coatings are reviewed here.

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A hetero-core structured fiber optic pH sensor

Cited by 49 publications

References 14 publications

Colorimetric Sensor Design

Colorimetric Sensor Design

Flow Injection Small-volume Fiber-optic pH Sensor Based on Evanescent Wave Excitation and Fluorescence Determination

Nanostructured Materials in Optical Fiber Sensing

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