Optical fiber pH sensor based on lossy-mode resonances by means of thin polymeric coatings

Zamarreño, Carlos R.; Hernáez, Miguel; Villar, Ignacio Del; Matı́as, Ignacio R.; Arregui, Francisco J.

doi:10.1016/j.snb.2010.12.037

Cited by 160 publications

(105 citation statements)

References 31 publications

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“…The sensitivity of a pH sensor is, of course, a measure of the degree of change in the sensor output with change in the solution pH. In optical sensors this transduction effect (that can then be related to the measurand) typically can be absorbance [12,35,36], reflected optical power [20,34], transmitted power [37] or the wavelength at maximum absorbance [22], for example, and indeed other effects can be used. Therefore, the sensitivity of the device will depend on the optimum choice of this transduction mechanism -where for example, a cross-comparison of Fig.…”

Section: Discussionmentioning

confidence: 99%

“…16. The PAH film is individually applied as a pH indicator [12,22,33] for which the value of pK a is reported to be between 8.0 to 8.8 [33,[38][39][40][41], where the pK a value for BY is 7. observed that the pK a value for both the odd and even number of layers decreases with an increase in the thickness of the thin film from 5.5 to 6 bilayers, whilst beyond this the pK a value starts to go up with an increasing number of bilayers. This means that the peak sensitivity of the probes slightly shifts for the alkaline region when more layers are deposited onto the fibre.…”

Section: Discussionmentioning

confidence: 99%

“…To immobilize some active indicators like azo dyes (for colorimetric sensing purposes) on optical fibres, the use of a polymeric matrix has been recommended [18]. Poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) are the most popular polycation and polyanion, respectively [19][20][21][22]. Changing the optical properties of sensitive films with changing analyte concentration is based on the recognition measurement.…”

Section: Introductionmentioning

confidence: 99%

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Wavelength dependent pH optical sensor using the layer-by-layer technique

Raoufi

Surre

Sun

et al. 2012

Sensors and Actuators B: Chemical

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This is the unspecified version of the paper.This version of the publication may differ from the final published version. Permanent repository link AbstractIn this work, the design and characteristics of a wavelength-dependent pH optical sensor have been studied. To create the sensor itself, brilliant yellow (BY) as a pH indicator and poly (allylamine hydrochloride) [PAH] as a cross-linker have been deposited on the end of a bare silica core of an optical fibre by use of a 'layer-by-layer' technique. In the experiments carried out to characterize the sensor, it was observed that the value of pK a (the dissociation constant) of the thin film is dependent both on the outer layer and the number of bilayers. A heat treatment process was applied to the sensor to reduce the effect on the deposited layers during the testing of the probe. As a result of these series of experiments, it could be concluded that the probe design on which were deposited structured layers comprising six double layers of (PAH/BY) showed the best sensitivity for a pH range from 6.80 to 9.00 (with an accuracy of ±0.20) and showing an average wavelength shift of 4.65 nm per 0.2 pH units, while the concentration of the BY and the PAH solutions was maintained as 0.25mM and 2.5mM respectively.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wavelength dependent pH optical sensor using the layer-by-layer technique

Raoufi

Surre

Sun

et al. 2012

Sensors and Actuators B: Chemical

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“…An important consideration is that the optical fiber field has shown a considerable growth thanks to the implementation and development of nanostructured thin films onto diverse optical fiber configurations. These nanostructured coatings make possible an enhancement in the response time as well as in the resultant sensitivity [114][115][116][117][118][119][120][121]. In addition, the presence of nanoparticles in these sensitive thin films has resulted in the design of high-performance fiber-optic sensors due to the inherent properties of the nanoparticles such as high surface area ratio and porosity [122][123][124][125][126].…”

Section: Optical Fiber Sensorsmentioning

confidence: 99%

Design of Nanostructured Functional Coatings by Using Wet-Chemistry Methods

et al. 2018

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This review reports the implementation of novel nanostructured functional coatings by using different surface engineering techniques based on wet chemistry. In the first section, the theoretical fundaments of three techniques such as sol-gel process, layer-by-layer (LbL) assembly and electrospinning will be briefly described. In the second section, selected applications in different potential fields will be presented gathering relevant properties such as superhydrophobicity, biocide behavior or applications in the field of optical fiber sensors.

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“…pH measurements have conventionally relied on either optical [41][42][43][44][45] or electrochemical techniques [46][47][48][49][50]. Optical methods offer high sensitivity and non-invasiveness, however, they often require the use of dyes, which can change their optical properties due to interactions with specific analytes.…”

Section: Ph Sensing Mechanismmentioning

confidence: 99%

Recent Developments in R.F. Magnetron Sputtered Thin Films for pH Sensing Applications—An Overview

2014

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pH sensors are widely used in chemical and biological applications. Metal oxides-based pH sensors have many attractive features including insolubility, stability, mechanical strength, electrocatalyst and manufacturing technology. Various metal oxide thin films prepared by radio frequency (R.F.) magnetron sputtering have attractive features, including high pH sensitivity, fast response, high resolution, good stability and reversibility as well as potential for measuring pH under conditions that are not favourable for the commonly used glass electrodes-based pH sensors. In addition, thin film pH sensors prepared by R.F. magnetron sputtering offer many advantages, such as ease of packaging, low cost through the use of standard microfabrication processes, miniaturisation, capability of measuring pH at high temperatures, ruggedness and disposability. In this paper, recent development of R.F. magnetron sputtered thin films for pH sensing applications are reviewed.

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Optical fiber pH sensor based on lossy-mode resonances by means of thin polymeric coatings

Cited by 160 publications

References 31 publications

Wavelength dependent pH optical sensor using the layer-by-layer technique

Wavelength dependent pH optical sensor using the layer-by-layer technique

Design of Nanostructured Functional Coatings by Using Wet-Chemistry Methods

Recent Developments in R.F. Magnetron Sputtered Thin Films for pH Sensing Applications—An Overview

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