Optical fiber pH sensors based on PAni-coated microstructured optical fibers

Date

2024-07-10

Authors

Lopes, Guilherme
Nedoma, Jan
Pereira, Sónia O.
Fernandes, Antonio J. S.
Jamier, Raphael
Roy, Philippe
Marques, Carlos

Director

Publisher

IEEE
Acceso abierto / Sarbide irekia
Artículo / Artikulua
Versión publicada / Argitaratu den bertsioa

Project identifier

  • AEI//PID2022-137269OBC21/
  • AEI//TED2021-130378B-C22/
Impacto
OpenAlexGoogle Scholar
cited by count

Abstract

In this article, we report the analysis of a novel optical fiber pH sensor based in polyaniline (PAni) coating applied on a trenched core-free (only-bridge) silica fiber. The results are compared to another pH sensor based on side-polished silica fiber. The pH-sensitive polymer is synthesized over the fiber sample by means of oxidative polymerization, keeping records of the time where the reaction occurs to improve the sensitivity. The response to pH is enhanced in the case of the trenched core-free bridge fiber due to the higher interaction of the evanescent field with the PAni film and, thus, the surrounding media. The sensitivity in the linear zone of operation is 1.1 mW/pH, and a total transmittance of 55% in the pH range is 4.2-8.1. The repeatability of both sensors was checked, showing a high capability to perform studies in liquid samples due to its temperature independence, good sensitivity, and long-term stability.

Description

Keywords

pH sensor, Polyaniline (PAni), Side-polished fiber, Trenched core-free fiber (TCFF)

Department

Ingeniería Eléctrica, Electrónica y de Comunicación / Ingeniaritza Elektrikoa, Elektronikoa eta Telekomunikazio Ingeniaritza / Institute of Smart Cities - ISC

Faculty/School

Degree

Doctorate program

item.page.cita

Rodriguez, A., Lopes, G., Nedoma, J., Pereira, S. O., Fernandes, A. J. S., Jamier, R., Roy, P., Bravo, M., Lopez-Amo, M., Marques, C. (2024) Optical Fiber pH Sensors Based on PAni-Coated Microstructured Optical Fibers. IEEE Sensors Journal, 24(16), 25748-25754. https://doi.org/10.1109/JSEN.2024.3419257.

item.page.rights

© 2024 The Authors. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Licencia

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