Polyaniline modified u-bent fiber optic pH sensor for physiological use

Chandra, Sutapa; Mukherji, Soumyo

doi:10.1109/icmap.2018.8354478

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…This behavior can be naturally explained in terms of changing the optical properties of PANI sensitive film through its RedOx conversion from Emeraldine to Pernigraniline. As suggested elsewhere [ 32 ], along with the RI changes of the PANI film when exposed to the pH solutions, the molecular conformation of the PANI polymeric chains could be also slightly altered. This phenomenon is more pronounced in acidic media, and it may lead to noisier FO-SPR spectral dips, as observed in Figure 6 A and Figure 7 A.…”

Section: Resultsmentioning

confidence: 53%

Sensitive pH Monitoring Using a Polyaniline-Functionalized Fiber Optic—Surface Plasmon Resonance Detector

Antohe

Jinga

Antohe

et al. 2021

Sensors

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In this work, we report results on the fabrication and characterization of a surface plasmon resonance (SPR) pH sensor using platinum (Pt) and polyaniline (PANI) layers successively coated over an unclad core of an optical fiber (FO). The plasmonic thin Pt layer was deposited using a magnetron sputtering technique, while the pH-sensitive PANI layer was synthesized using an electroless polymerization method. Moreover, the formation of PANI film was confirmed by X-ray photoelectron spectroscopy (XPS) technique and its surface morphology was investigated using scanning electron microscopy (SEM). It was found that the PANI/Pt-coated FO-SPR pH sensor exhibits a fast and linear response in either acid or alkali solutions (pH operational range: 1 to 14). The proposed FO-SPR sensor could be used for biomedical applications, environmental monitoring or any remote, real-time on-site measurements.

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Section: Resultsmentioning

confidence: 53%

Sensitive pH Monitoring Using a Polyaniline-Functionalized Fiber Optic—Surface Plasmon Resonance Detector

Antohe

Jinga

Antohe

et al. 2021

Sensors

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show abstract

Section: Principle Of Figure-eight Knot-based Comb Filtermentioning

confidence: 99%

“…Owing to the core mode and cladding modes having different propagation constants, an interference pattern results from the transmitted wave at the lead-out section of the fabricated sensor configuration. The resultant phase difference that generated the mode interference among the core and cladding modes is given by the expression: 32 , 33 φ=4πΔneffL/λ,where L is the effective length of the sensor that is related to the bend radius of curvature, λ is the input wavelength in free space, and Δneff is the effective refractive index difference of the core and cladding modes, which is defined as Δneff=neffcore−neffcladding.…”

Section: Principle Of Figure-eight Knot-based Comb Filtermentioning

confidence: 99%

Switchable mode-locked ytterbium-doped fiber laser based on macrobending loss tuning of figure-eight knot fiber structure

Al-Janabi,

Merza,

Al-Hayali

et al. 2024

Opt. Eng.

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We report on the demonstration of a switchable and adjustable spacing multiwavelength nanosecond pulsed ytterbium-doped fiber laser (YDFL) operating in a modelocking regime by macrobending loss tuning induced in a figure-eight knot shape. The figure-eight knot-based Mach-Zehnder interferometer (MZI) was established by wrapping a section of single-mode fiber into two elliptical loops by twisting one end of the fiber onto the other without splicing. Combining the proposed MZI with a polarization controller (PC) acts as a selective comb filter and a nanosecond pulse generator. By appropriately adjusting the bending diameter of the MZI structure inside the YDFL cavity, the laser can be operated in a single-and dual-wavelength with a maximum spacing range of 18.5 nm. Furthermore, the number of lasing wavelengths was directly controlled by only altering the pump power; dual and triple wavelengths were achieved as the pump power was increased from 127 to 210 mW, respectively. The appropriate adjustment of the PC cascaded with the proposed comb filter in the laser cavity allows for the generation of up to quadruple switchable wavelengths of nanosecond mode-locking pulses with a pulse duration of 6.2 ns and repetition rate of 71.4 MHz located between 1061.17 and 1038.92 nm. The experimental results indicate that the proposed configuration of the MZI-based comb filter can provide great potential in various photonics applications.

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Polyaniline modified u-bent fiber optic pH sensor for physiological use

Cited by 2 publications

References 2 publications

Sensitive pH Monitoring Using a Polyaniline-Functionalized Fiber Optic—Surface Plasmon Resonance Detector

Sensitive pH Monitoring Using a Polyaniline-Functionalized Fiber Optic—Surface Plasmon Resonance Detector

Switchable mode-locked ytterbium-doped fiber laser based on macrobending loss tuning of figure-eight knot fiber structure

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