Effects of the Dopant Ratio on Polyaniline Coated Fiber Bragg Grating for pH detection

Chiam, Yeong Siang; Ahad, Irma Zulayka Mohamad; Harun, Sulaiman Wadi; Gan, Seng Neon; Phang, Sook‐Wai

doi:10.1016/j.synthmet.2015.11.026

Cited by 11 publications

(7 citation statements)

References 21 publications

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“…However, optical pH sensors prepared by the former method suffer from non-linear responses, narrow dynamic range for pH measurement and short lifetimes due to the leaching out of the immobilized indicator dyes. The shortcomings of the indicator-based optical pH sensors can be alleviated by using pH-responsive electrically conducting polymers (ECPs) such as polypyrrole and polyaniline [ 31 , 32 ]. Thin films coated with ECPs represent an interesting alternative to indicator-based pH sensor films due to their inherent optical response properties and wider dynamic range for pH measurement.…”

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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“…16 Meanwhile, C-N stretching can be found at the peak of 1244 cm À1 , which indicates that PAni was highly doped and presented in emeraldine salt (ES) states. 18 The band observed at 803 cm À1 were ascribed to the bending vibration of the C-H bond in the para-disubstituted rings of PAni.…”

Section: Resultsmentioning

confidence: 99%

Effects of synthesised polyaniline (PAni) contents on the anti-static properties of PAni-based polylactic acid (PLA) films

2020

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“…19,20 These advantages are essential for practical applications where highly efficient electromagnetic absorption/shielding capabilities are required. Until now, considerable theoretical and experimental researches have been devoted to tailoring the electromagnetic properties of PANI and its composites through controlling their structure, 21,22 combining with other materials, 23,24 or introducing other constituents. 25,26 For instance, protonic acid dopants were introduced to alter the electrical conductivity of PANI and found a conductivity increase from ∼0.45 to 10.2 S• cm −1 .…”

Section: Introductionmentioning

confidence: 99%

“…25,26 For instance, protonic acid dopants were introduced to alter the electrical conductivity of PANI and found a conductivity increase from ∼0.45 to 10.2 S• cm −1 . 21 Composite composed of PANI as matrix and graphene decorating with silver nanoparticles as fillers was developed, and a high EMI shielding effectiveness (SE) of 29.3 dB was achieved at the thickness of 10.0 mm. 26 In addition, PANI− graphene film was fabricated by a solution intercalation method and the SE value of 32 dB was observed in X-band.…”

Section: Introductionmentioning

confidence: 99%

Tunable Electromagnetic Interference Shielding Ability in a One-Dimensional Bagasse Fiber/Polyaniline Heterostructure

Zhang

Yang

et al. 2019

ACS Appl. Polym. Mater.

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Development of highly efficient electromagnetic interference (EMI) shielding materials with tunable properties is essential for the modern electronics industry against severe electromagnetic pollution. Herein, a series of novel heterostructured bagasse fiber/polyaniline (BF/PANI) composites are successfully synthesized via a facile in situ polymerization method and both their EMI shielding effectiveness (SE) and mechanisms were analyzed experimentally and theoretically. The results show that the conductivity and EMI shielding properties of BF/PANI composites can be tailored by adjusting the component, microstructure, and electromagnetic parameter, which can be easily tuned by modulating the weight ratio of aniline monomer and BF. More significantly, the BF/PANI heterostructures exhibit remarkable enhanced EMI shielding capabilities compared with the pristine PANI. The BF/PANI heterostructure prepared with an aniline volume of 7 mL shows an electrical conductivity of 6.07 S·cm–1 and the best EMI shielding capabilities of 35.73 dB. The excellent microwave attenuation capacity can be attributed to the cooperation of interface polarization, conductivity, skin depth effect, and the novel heterostructure. Considering their fascinating performance, these BF/PANI composites are proving to be the promising candidates as highly efficient EMI shielding materials.

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Effects of the Dopant Ratio on Polyaniline Coated Fiber Bragg Grating for pH detection

Cited by 11 publications

References 21 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

Effects of synthesised polyaniline (PAni) contents on the anti-static properties of PAni-based polylactic acid (PLA) films

Tunable Electromagnetic Interference Shielding Ability in a One-Dimensional Bagasse Fiber/Polyaniline Heterostructure

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