pH optical sensor based on thin films of sol–gel with bromocresol purple

Timbó, Átila Pereira; Pinto, Paulo; Pinho, Hilton Andrade; Moura, Lucas Pinheiro de; Chretien, Jécol Bamutsha; Viana, Flávio Wanderley; Filho, Rogério Guerra Diógenes; Silva, Erandir Brasil da; Silva, Marcos Erick Rodrigues da; Menezes, Jaileila de Araújo; Guimarães, G. F.; Fraga, W. B.

doi:10.1016/j.snb.2015.09.066

Cited by 27 publications

(10 citation statements)

References 15 publications

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“…Planar and fiber-optic based sensing platforms have been used for fabrication of optical pH sensors with different geometries [ 22 ]. The change in the optical properties of the immobilized reagents/dyes is measured by recording the corresponding absorbance [ 23 , 24 ] or fluorescence [ 25 , 26 , 27 ] signal at certain pH conditions.…”

Section: Introductionmentioning

confidence: 99%

A Flexible Optical pH Sensor Based on Polysulfone Membranes Coated with pH-Responsive Polyaniline Nanofibers

Abu-Thabit

Umar

Ratemi

et al. 2016

Sensors

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Abstract:A new optical pH sensor based on polysulfone (PSU) and polyaniline (PANI) was developed. A transparent and flexible PSU membrane was employed as a support. The electrically conductive and pH-responsive PANI was deposited onto the membrane surface by in situ chemical oxidative polymerization (COP). The absorption spectra of the PANI-coated PSU membranes exhibited sensitivity to pH changes in the range of 4-12, which allowed for designing a dual wavelength pH optical sensor. The performance of the membranes was assessed by measuring their response starting from high pH and going down to low pH, and vice versa. It was found that it is necessary to precondition the sensor layers before each measurement due to the slight hysteresis observed during forward and backward pH titrations. PSU membranes with polyaniline coating thicknesses in the range of «100-200 nm exhibited fast response times of <4 s, which are attributed to the porous, rough and nanofibrillar morphology of the polyaniline coating. The fabricated pH sensor was characterized by a sigmoidal response (R 2 = 0.997) which allows for pH determination over a wide dynamic range. All membranes were stable for a period of more than six months when stored in 1 M HCl solution. The reproducibility of the fabricated optical pH sensors was found to be <0.02 absorption units after one month storage in 1 M HCl solution. The performance of the optical pH sensor was tested and the obtained pH values were compared with the results obtained using a pH meter device.

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Section: Introductionmentioning

confidence: 99%

A Flexible Optical pH Sensor Based on Polysulfone Membranes Coated with pH-Responsive Polyaniline Nanofibers

Abu-Thabit

Umar

Ratemi

et al. 2016

Sensors

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“…23 Many other authors proposed sensors with different pH indicators entrapped in a sol–gel matrix, but these studies were not focused on concrete monitoring. 24 -47…”

Section: Introductionmentioning

confidence: 99%

Sol–gel-entrapped pH indicator for monitoring pH variations in cementitious materials

Inserra

Hayashi

Marchisio

et al. 2020

Journal of Applied Biomaterials & Functional Materials

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“…These mesoporous materials are excellent not only for accommodating active dopants but also for sensing analytes to be easily diffused towards the sensing centers [4,5,10]. More recent research work were reported with respect new optical pH sensors [11][12][13]. The use of surfactants do affect the mesoporosity of host silica for accommodation the active dopants, with respect to the host silica surfactants are surely improve the mesoporosity and better accommodation sites within the silica network [10].…”

Section: Introductionmentioning

confidence: 99%

“…Absorption spectra of TB-entrapped silica/SDS (0.0005 M) at pH(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) …”

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confidence: 99%

Sol–Gel Encapsulation of Thymol Blue in Presence of Some Surfactants

2019

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Transparent monolithic discs were obtained in presence of different surfactants: sodium dodecyl sulfate (SDS), ethanediyl-1,2-bis (dimethyldodecylammonium bromide (Gemini 12-2-12) or alkyl hydroxyethyl dimethyl ammonium chloride (HY). The use of surfactants has modified the morphology and porosity of the silica host matrix for better sensing properties. The entrapment of TB into silica matrix has shifted pK a value to more basic and less acidic. The presence of Gemini 12-2-12 and HY surfactants has shifted pK a value to more acidic, whereas SDS has shifted pK a to more basic in comparison with that of entrapped TB/silica.

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pH optical sensor based on thin films of sol–gel with bromocresol purple

Cited by 27 publications

References 15 publications

A Flexible Optical pH Sensor Based on Polysulfone Membranes Coated with pH-Responsive Polyaniline Nanofibers

A Flexible Optical pH Sensor Based on Polysulfone Membranes Coated with pH-Responsive Polyaniline Nanofibers

Sol–gel-entrapped pH indicator for monitoring pH variations in cementitious materials

Sol–Gel Encapsulation of Thymol Blue in Presence of Some Surfactants

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