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

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 sputt...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2021-06, Vol.21 (12), p.4218
Main Authors: Antohe, Iulia, Jinga, Luiza-Izabela, Antohe, Vlad-Andrei, Socol, Gabriel
Format: Article
Language:English
Subjects:
Biomedical materials
Electroless plating
Environmental monitoring
Fiber optics
fiber optic–surface plasmon resonance (FO-SPR) sensors
Hydrogels
Magnetron sputtering
Optical fibers
pH monitoring
pH sensitive polymer
Photoelectrons
Platinum (Pt) thin film
Polyaniline (PANI) electroless synthesis
Polyanilines
Polymerization
Remote monitoring
Remote sensors
Sensors
Spectrum analysis
Sucrose
Surface plasmon resonance
X ray photoelectron spectroscopy
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Summary: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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s21124218